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import contextlib import copy import inspect import pickle import sys import types import traceback import unittest import warnings from test import support from test.support import import_helper from test.support import warnings_helper from test.support.script_helper import assert_python_ok class AsyncYieldFrom: def __init__(self, obj): self.obj = obj def __await__(self): yield from self.obj class AsyncYield: def __init__(self, value): self.value = value def __await__(self): yield self.value async def asynciter(iterable): """Convert an iterable to an asynchronous iterator.""" for x in iterable: yield x def run_async(coro): assert coro.__class__ in {types.GeneratorType, types.CoroutineType} buffer = [] result = None while True: try: buffer.append(coro.send(None)) except StopIteration as ex: result = ex.args[0] if ex.args else None break return buffer, result def run_async__await__(coro): assert coro.__class__ is types.CoroutineType aw = coro.__await__() buffer = [] result = None i = 0 while True: try: if i % 2: buffer.append(next(aw)) else: buffer.append(aw.send(None)) i += 1 except StopIteration as ex: result = ex.args[0] if ex.args else None break return buffer, result @contextlib.contextmanager def silence_coro_gc(): with warnings.catch_warnings(): warnings.simplefilter("ignore") yield support.gc_collect() class AsyncBadSyntaxTest(unittest.TestCase): def test_badsyntax_1(self): samples = [ """def foo(): await something() """, """await something()""", """async def foo(): yield from [] """, """async def foo(): await await fut """, """async def foo(a=await something()): pass """, """async def foo(a:await something()): pass """, """async def foo(): def bar(): [i async for i in els] """, """async def foo(): def bar(): [await i for i in els] """, """async def foo(): def bar(): [i for i in els async for b in els] """, """async def foo(): def bar(): [i for i in els for c in b async for b in els] """, """async def foo(): def bar(): [i for i in els async for b in els for c in b] """, """async def foo(): def bar(): [[async for i in b] for b in els] """, """async def foo(): def bar(): [i for i in els for b in await els] """, """async def foo(): def bar(): [i for i in els for b in els if await b] """, """async def foo(): def bar(): [i for i in await els] """, """async def foo(): def bar(): [i for i in els if await i] """, """def bar(): [i async for i in els] """, """def bar(): {i: i async for i in els} """, """def bar(): {i async for i in els} """, """def bar(): [await i for i in els] """, """def bar(): [i for i in els async for b in els] """, """def bar(): [i for i in els for c in b async for b in els] """, """def bar(): [i for i in els async for b in els for c in b] """, """def bar(): [i for i in els for b in await els] """, """def bar(): [i for i in els for b in els if await b] """, """def bar(): [i for i in await els] """, """def bar(): [i for i in els if await i] """, """def bar(): [[i async for i in a] for a in elts] """, """[[i async for i in a] for a in elts] """, """async def foo(): await """, """async def foo(): def bar(): pass await = 1 """, """async def foo(): def bar(): pass await = 1 """, """async def foo(): def bar(): pass if 1: await = 1 """, """def foo(): async def bar(): pass if 1: await a """, """def foo(): async def bar(): pass await a """, """def foo(): def baz(): pass async def bar(): pass await a """, """def foo(): def baz(): pass # 456 async def bar(): pass # 123 await a """, """async def foo(): def baz(): pass # 456 async def bar(): pass # 123 await = 2 """, """def foo(): def baz(): pass async def bar(): pass await a """, """async def foo(): def baz(): pass async def bar(): pass await = 2 """, """async def foo(): def async(): pass """, """async def foo(): def await(): pass """, """async def foo(): def bar(): await """, """async def foo(): return lambda async: await """, """async def foo(): return lambda a: await """, """await a()""", """async def foo(a=await b): pass """, """async def foo(a:await b): pass """, """def baz(): async def foo(a=await b): pass """, """async def foo(async): pass """, """async def foo(): def bar(): def baz(): async = 1 """, """async def foo(): def bar(): def baz(): pass async = 1 """, """def foo(): async def bar(): async def baz(): pass def baz(): 42 async = 1 """, """async def foo(): def bar(): def baz(): pass\nawait foo() """, """def foo(): def bar(): async def baz(): pass\nawait foo() """, """async def foo(await): pass """, """def foo(): async def bar(): pass await a """, """def foo(): async def bar(): pass\nawait a """, """def foo(): async for i in arange(2): pass """, """def foo(): async with resource: pass """, """async with resource: pass """, """async for i in arange(2): pass """, ] for code in samples: with self.subTest(code=code), self.assertRaises(SyntaxError): compile(code, "<test>", "exec") def test_badsyntax_2(self): samples = [ """def foo(): await = 1 """, """class Bar: def async(): pass """, """class Bar: async = 1 """, """class async: pass """, """class await: pass """, """import math as await""", """def async(): pass""", """def foo(*, await=1): pass""" """async = 1""", """print(await=1)""" ] for code in samples: with self.subTest(code=code), self.assertRaises(SyntaxError): compile(code, "<test>", "exec") def test_badsyntax_3(self): with self.assertRaises(SyntaxError): compile("async = 1", "<test>", "exec") def test_badsyntax_4(self): samples = [ '''def foo(await): async def foo(): pass async def foo(): pass return await + 1 ''', '''def foo(await): async def foo(): pass async def foo(): pass return await + 1 ''', '''def foo(await): async def foo(): pass async def foo(): pass return await + 1 ''', '''def foo(await): """spam""" async def foo(): \ pass # 123 async def foo(): pass # 456 return await + 1 ''', '''def foo(await): def foo(): pass def foo(): pass async def bar(): return await_ await_ = await try: bar().send(None) except StopIteration as ex: return ex.args[0] + 1 ''' ] for code in samples: with self.subTest(code=code), self.assertRaises(SyntaxError): compile(code, "<test>", "exec") class TokenizerRegrTest(unittest.TestCase): def test_oneline_defs(self): buf = [] for i in range(500): buf.append('def i{i}(): return {i}'.format(i=i)) buf = '\n'.join(buf) # Test that 500 consequent, one-line defs is OK ns = {} exec(buf, ns, ns) self.assertEqual(ns['i499'](), 499) # Test that 500 consequent, one-line defs *and* # one 'async def' following them is OK buf += '\nasync def foo():\n return' ns = {} exec(buf, ns, ns) self.assertEqual(ns['i499'](), 499) self.assertTrue(inspect.iscoroutinefunction(ns['foo'])) class CoroutineTest(unittest.TestCase): def test_gen_1(self): def gen(): yield self.assertFalse(hasattr(gen, '__await__')) def test_func_1(self): async def foo(): return 10 f = foo() self.assertIsInstance(f, types.CoroutineType) self.assertTrue(bool(foo.__code__.co_flags & inspect.CO_COROUTINE)) self.assertFalse(bool(foo.__code__.co_flags & inspect.CO_GENERATOR)) self.assertTrue(bool(f.cr_code.co_flags & inspect.CO_COROUTINE)) self.assertFalse(bool(f.cr_code.co_flags & inspect.CO_GENERATOR)) self.assertEqual(run_async(f), ([], 10)) self.assertEqual(run_async__await__(foo()), ([], 10)) def bar(): pass self.assertFalse(bool(bar.__code__.co_flags & inspect.CO_COROUTINE)) def test_func_2(self): async def foo(): raise StopIteration with self.assertRaisesRegex( RuntimeError, "coroutine raised StopIteration"): run_async(foo()) def test_func_3(self): async def foo(): raise StopIteration coro = foo() self.assertRegex(repr(coro), '^<coroutine object.* at 0x.*>$') coro.close() def test_func_4(self): async def foo(): raise StopIteration coro = foo() check = lambda: self.assertRaisesRegex( TypeError, "'coroutine' object is not iterable") with check(): list(coro) with check(): tuple(coro) with check(): sum(coro) with check(): iter(coro) with check(): for i in coro: pass with check(): [i for i in coro] coro.close() def test_func_5(self): @types.coroutine def bar(): yield 1 async def foo(): await bar() check = lambda: self.assertRaisesRegex( TypeError, "'coroutine' object is not iterable") coro = foo() with check(): for el in coro: pass coro.close() # the following should pass without an error for el in bar(): self.assertEqual(el, 1) self.assertEqual([el for el in bar()], [1]) self.assertEqual(tuple(bar()), (1,)) self.assertEqual(next(iter(bar())), 1) def test_func_6(self): @types.coroutine def bar(): yield 1 yield 2 async def foo(): await bar() f = foo() self.assertEqual(f.send(None), 1) self.assertEqual(f.send(None), 2) with self.assertRaises(StopIteration): f.send(None) def test_func_7(self): async def bar(): return 10 coro = bar() def foo(): yield from coro with self.assertRaisesRegex( TypeError, "cannot 'yield from' a coroutine object in " "a non-coroutine generator"): list(foo()) coro.close() def test_func_8(self): @types.coroutine def bar(): return (yield from coro) async def foo(): return 'spam' coro = foo() self.assertEqual(run_async(bar()), ([], 'spam')) coro.close() def test_func_9(self): async def foo(): pass with self.assertWarnsRegex( RuntimeWarning, r"coroutine '.*test_func_9.*foo' was never awaited"): foo() support.gc_collect() with self.assertWarnsRegex( RuntimeWarning, r"coroutine '.*test_func_9.*foo' was never awaited"): with self.assertRaises(TypeError): # See bpo-32703. for _ in foo(): pass support.gc_collect() def test_func_10(self): N = 0 @types.coroutine def gen(): nonlocal N try: a = yield yield (a ** 2) except ZeroDivisionError: N += 100 raise finally: N += 1 async def foo(): await gen() coro = foo() aw = coro.__await__() self.assertIs(aw, iter(aw)) next(aw) self.assertEqual(aw.send(10), 100) self.assertEqual(N, 0) aw.close() self.assertEqual(N, 1) coro = foo() aw = coro.__await__() next(aw) with self.assertRaises(ZeroDivisionError): aw.throw(ZeroDivisionError, None, None) self.assertEqual(N, 102) def test_func_11(self): async def func(): pass coro = func() # Test that PyCoro_Type and _PyCoroWrapper_Type types were properly # initialized self.assertIn('__await__', dir(coro)) self.assertIn('__iter__', dir(coro.__await__())) self.assertIn('coroutine_wrapper', repr(coro.__await__())) coro.close() # avoid RuntimeWarning def test_func_12(self): async def g(): i = me.send(None) await foo me = g() with self.assertRaisesRegex(ValueError, "coroutine already executing"): me.send(None) def test_func_13(self): async def g(): pass coro = g() with self.assertRaisesRegex( TypeError, "can't send non-None value to a just-started coroutine"): coro.send('spam') coro.close() def test_func_14(self): @types.coroutine def gen(): yield async def coro(): try: await gen() except GeneratorExit: await gen() c = coro() c.send(None) with self.assertRaisesRegex(RuntimeError, "coroutine ignored GeneratorExit"): c.close() def test_func_15(self): # See http://bugs.python.org/issue25887 for details async def spammer(): return 'spam' async def reader(coro): return await coro spammer_coro = spammer() with self.assertRaisesRegex(StopIteration, 'spam'): reader(spammer_coro).send(None) with self.assertRaisesRegex(RuntimeError, 'cannot reuse already awaited coroutine'): reader(spammer_coro).send(None) def test_func_16(self): # See http://bugs.python.org/issue25887 for details @types.coroutine def nop(): yield async def send(): await nop() return 'spam' async def read(coro): await nop() return await coro spammer = send() reader = read(spammer) reader.send(None) reader.send(None) with self.assertRaisesRegex(Exception, 'ham'): reader.throw(Exception('ham')) reader = read(spammer) reader.send(None) with self.assertRaisesRegex(RuntimeError, 'cannot reuse already awaited coroutine'): reader.send(None) with self.assertRaisesRegex(RuntimeError, 'cannot reuse already awaited coroutine'): reader.throw(Exception('wat')) def test_func_17(self): # See http://bugs.python.org/issue25887 for details async def coroutine(): return 'spam' coro = coroutine() with self.assertRaisesRegex(StopIteration, 'spam'): coro.send(None) with self.assertRaisesRegex(RuntimeError, 'cannot reuse already awaited coroutine'): coro.send(None) with self.assertRaisesRegex(RuntimeError, 'cannot reuse already awaited coroutine'): coro.throw(Exception('wat')) # Closing a coroutine shouldn't raise any exception even if it's # already closed/exhausted (similar to generators) coro.close() coro.close() def test_func_18(self): # See http://bugs.python.org/issue25887 for details async def coroutine(): return 'spam' coro = coroutine() await_iter = coro.__await__() it = iter(await_iter) with self.assertRaisesRegex(StopIteration, 'spam'): it.send(None) with self.assertRaisesRegex(RuntimeError, 'cannot reuse already awaited coroutine'): it.send(None) with self.assertRaisesRegex(RuntimeError, 'cannot reuse already awaited coroutine'): # Although the iterator protocol requires iterators to # raise another StopIteration here, we don't want to do # that. In this particular case, the iterator will raise # a RuntimeError, so that 'yield from' and 'await' # expressions will trigger the error, instead of silently # ignoring the call. next(it) with self.assertRaisesRegex(RuntimeError, 'cannot reuse already awaited coroutine'): it.throw(Exception('wat')) with self.assertRaisesRegex(RuntimeError, 'cannot reuse already awaited coroutine'): it.throw(Exception('wat')) # Closing a coroutine shouldn't raise any exception even if it's # already closed/exhausted (similar to generators) it.close() it.close() def test_func_19(self): CHK = 0 @types.coroutine def foo(): nonlocal CHK yield try: yield except GeneratorExit: CHK += 1 async def coroutine(): await foo() coro = coroutine() coro.send(None) coro.send(None) self.assertEqual(CHK, 0) coro.close() self.assertEqual(CHK, 1) for _ in range(3): # Closing a coroutine shouldn't raise any exception even if it's # already closed/exhausted (similar to generators) coro.close() self.assertEqual(CHK, 1) def test_coro_wrapper_send_tuple(self): async def foo(): return (10,) result = run_async__await__(foo()) self.assertEqual(result, ([], (10,))) def test_coro_wrapper_send_stop_iterator(self): async def foo(): return StopIteration(10) result = run_async__await__(foo()) self.assertIsInstance(result[1], StopIteration) self.assertEqual(result[1].value, 10) def test_cr_await(self): @types.coroutine def a(): self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_RUNNING) self.assertIsNone(coro_b.cr_await) yield self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_RUNNING) self.assertIsNone(coro_b.cr_await) async def c(): await a() async def b(): self.assertIsNone(coro_b.cr_await) await c() self.assertIsNone(coro_b.cr_await) coro_b = b() self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_CREATED) self.assertIsNone(coro_b.cr_await) coro_b.send(None) self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_SUSPENDED) self.assertEqual(coro_b.cr_await.cr_await.gi_code.co_name, 'a') with self.assertRaises(StopIteration): coro_b.send(None) # complete coroutine self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_CLOSED) self.assertIsNone(coro_b.cr_await) def test_corotype_1(self): ct = types.CoroutineType if not support.MISSING_C_DOCSTRINGS: self.assertIn('into coroutine', ct.send.__doc__) self.assertIn('inside coroutine', ct.close.__doc__) self.assertIn('in coroutine', ct.throw.__doc__) self.assertIn('of the coroutine', ct.__dict__['__name__'].__doc__) self.assertIn('of the coroutine', ct.__dict__['__qualname__'].__doc__) self.assertEqual(ct.__name__, 'coroutine') async def f(): pass c = f() self.assertIn('coroutine object', repr(c)) c.close() def test_await_1(self): async def foo(): await 1 with self.assertRaisesRegex(TypeError, "object int can.t.*await"): run_async(foo()) def test_await_2(self): async def foo(): await [] with self.assertRaisesRegex(TypeError, "object list can.t.*await"): run_async(foo()) def test_await_3(self): async def foo(): await AsyncYieldFrom([1, 2, 3]) self.assertEqual(run_async(foo()), ([1, 2, 3], None)) self.assertEqual(run_async__await__(foo()), ([1, 2, 3], None)) def test_await_4(self): async def bar(): return 42 async def foo(): return await bar() self.assertEqual(run_async(foo()), ([], 42)) def test_await_5(self): class Awaitable: def __await__(self): return async def foo(): return (await Awaitable()) with self.assertRaisesRegex( TypeError, "__await__.*returned non-iterator of type"): run_async(foo()) def test_await_6(self): class Awaitable: def __await__(self): return iter([52]) async def foo(): return (await Awaitable()) self.assertEqual(run_async(foo()), ([52], None)) def test_await_7(self): class Awaitable: def __await__(self): yield 42 return 100 async def foo(): return (await Awaitable()) self.assertEqual(run_async(foo()), ([42], 100)) def test_await_8(self): class Awaitable: pass async def foo(): return await Awaitable() with self.assertRaisesRegex( TypeError, "object Awaitable can't be used in 'await' expression"): run_async(foo()) def test_await_9(self): def wrap(): return bar async def bar(): return 42 async def foo(): db = {'b': lambda: wrap} class DB: b = wrap return (await bar() + await wrap()() + await db['b']()()() + await bar() * 1000 + await DB.b()()) async def foo2(): return -await bar() self.assertEqual(run_async(foo()), ([], 42168)) self.assertEqual(run_async(foo2()), ([], -42)) def test_await_10(self): async def baz(): return 42 async def bar(): return baz() async def foo(): return await (await bar()) self.assertEqual(run_async(foo()), ([], 42)) def test_await_11(self): def ident(val): return val async def bar(): return 'spam' async def foo(): return ident(val=await bar()) async def foo2(): return await bar(), 'ham' self.assertEqual(run_async(foo2()), ([], ('spam', 'ham'))) def test_await_12(self): async def coro(): return 'spam' c = coro() class Awaitable: def __await__(self): return c async def foo(): return await Awaitable() with self.assertRaisesRegex( TypeError, r"__await__\(\) returned a coroutine"): run_async(foo()) c.close() def test_await_13(self): class Awaitable: def __await__(self): return self async def foo(): return await Awaitable() with self.assertRaisesRegex( TypeError, "__await__.*returned non-iterator of type"): run_async(foo()) def test_await_14(self): class Wrapper: # Forces the interpreter to use CoroutineType.__await__ def __init__(self, coro): assert coro.__class__ is types.CoroutineType self.coro = coro def __await__(self): return self.coro.__await__() class FutureLike: def __await__(self): return (yield) class Marker(Exception): pass async def coro1(): try: return await FutureLike() except ZeroDivisionError: raise Marker async def coro2(): return await Wrapper(coro1()) c = coro2() c.send(None) with self.assertRaisesRegex(StopIteration, 'spam'): c.send('spam') c = coro2() c.send(None) with self.assertRaises(Marker): c.throw(ZeroDivisionError) def test_await_15(self): @types.coroutine def nop(): yield async def coroutine(): await nop() async def waiter(coro): await coro coro = coroutine() coro.send(None) with self.assertRaisesRegex(RuntimeError, "coroutine is being awaited already"): waiter(coro).send(None) def test_await_16(self): # See https://bugs.python.org/issue29600 for details. async def f(): return ValueError() async def g(): try: raise KeyError except: return await f() _, result = run_async(g()) self.assertIsNone(result.__context__) def test_with_1(self): class Manager: def __init__(self, name): self.name = name async def __aenter__(self): await AsyncYieldFrom(['enter-1-' + self.name, 'enter-2-' + self.name]) return self async def __aexit__(self, *args): await AsyncYieldFrom(['exit-1-' + self.name, 'exit-2-' + self.name]) if self.name == 'B': return True async def foo(): async with Manager("A") as a, Manager("B") as b: await AsyncYieldFrom([('managers', a.name, b.name)]) 1/0 f = foo() result, _ = run_async(f) self.assertEqual( result, ['enter-1-A', 'enter-2-A', 'enter-1-B', 'enter-2-B', ('managers', 'A', 'B'), 'exit-1-B', 'exit-2-B', 'exit-1-A', 'exit-2-A'] ) async def foo(): async with Manager("A") as a, Manager("C") as c: await AsyncYieldFrom([('managers', a.name, c.name)]) 1/0 with self.assertRaises(ZeroDivisionError): run_async(foo()) def test_with_2(self): class CM: def __aenter__(self): pass body_executed = None async def foo(): nonlocal body_executed body_executed = False async with CM(): body_executed = True with self.assertRaisesRegex(TypeError, 'asynchronous context manager.*__aexit__'): run_async(foo()) self.assertIs(body_executed, False) def test_with_3(self): class CM: def __aexit__(self): pass body_executed = None async def foo(): nonlocal body_executed body_executed = False async with CM(): body_executed = True with self.assertRaisesRegex(TypeError, 'asynchronous context manager'): run_async(foo()) self.assertIs(body_executed, False) def test_with_4(self): class CM: pass body_executed = None async def foo(): nonlocal body_executed body_executed = False async with CM(): body_executed = True with self.assertRaisesRegex(TypeError, 'asynchronous context manager'): run_async(foo()) self.assertIs(body_executed, False) def test_with_5(self): # While this test doesn't make a lot of sense, # it's a regression test for an early bug with opcodes # generation class CM: async def __aenter__(self): return self async def __aexit__(self, *exc): pass async def func(): async with CM(): self.assertEqual((1, ), 1) with self.assertRaises(AssertionError): run_async(func()) def test_with_6(self): class CM: def __aenter__(self): return 123 def __aexit__(self, *e): return 456 async def foo(): async with CM(): pass with self.assertRaisesRegex( TypeError, "'async with' received an object from __aenter__ " "that does not implement __await__: int"): # it's important that __aexit__ wasn't called run_async(foo()) def test_with_7(self): class CM: async def __aenter__(self): return self def __aexit__(self, *e): return 444 # Exit with exception async def foo(): async with CM(): 1/0 try: run_async(foo()) except TypeError as exc: self.assertRegex( exc.args[0], "'async with' received an object from __aexit__ " "that does not implement __await__: int") self.assertTrue(exc.__context__ is not None) self.assertTrue(isinstance(exc.__context__, ZeroDivisionError)) else: self.fail('invalid asynchronous context manager did not fail') def test_with_8(self): CNT = 0 class CM: async def __aenter__(self): return self def __aexit__(self, *e): return 456 # Normal exit async def foo(): nonlocal CNT async with CM(): CNT += 1 with self.assertRaisesRegex( TypeError, "'async with' received an object from __aexit__ " "that does not implement __await__: int"): run_async(foo()) self.assertEqual(CNT, 1) # Exit with 'break' async def foo(): nonlocal CNT for i in range(2): async with CM(): CNT += 1 break with self.assertRaisesRegex( TypeError, "'async with' received an object from __aexit__ " "that does not implement __await__: int"): run_async(foo()) self.assertEqual(CNT, 2) # Exit with 'continue' async def foo(): nonlocal CNT for i in range(2): async with CM(): CNT += 1 continue with self.assertRaisesRegex( TypeError, "'async with' received an object from __aexit__ " "that does not implement __await__: int"): run_async(foo()) self.assertEqual(CNT, 3) # Exit with 'return' async def foo(): nonlocal CNT async with CM(): CNT += 1 return with self.assertRaisesRegex( TypeError, "'async with' received an object from __aexit__ " "that does not implement __await__: int"): run_async(foo()) self.assertEqual(CNT, 4) def test_with_9(self): CNT = 0 class CM: async def __aenter__(self): return self async def __aexit__(self, *e): 1/0 async def foo(): nonlocal CNT async with CM(): CNT += 1 with self.assertRaises(ZeroDivisionError): run_async(foo()) self.assertEqual(CNT, 1) def test_with_10(self): CNT = 0 class CM: async def __aenter__(self): return self async def __aexit__(self, *e): 1/0 async def foo(): nonlocal CNT async with CM(): async with CM(): raise RuntimeError try: run_async(foo()) except ZeroDivisionError as exc: self.assertTrue(exc.__context__ is not None) self.assertTrue(isinstance(exc.__context__, ZeroDivisionError)) self.assertTrue(isinstance(exc.__context__.__context__, RuntimeError)) else: self.fail('exception from __aexit__ did not propagate') def test_with_11(self): CNT = 0 class CM: async def __aenter__(self): raise NotImplementedError async def __aexit__(self, *e): 1/0 async def foo(): nonlocal CNT async with CM(): raise RuntimeError try: run_async(foo()) except NotImplementedError as exc: self.assertTrue(exc.__context__ is None) else: self.fail('exception from __aenter__ did not propagate') def test_with_12(self): CNT = 0 class CM: async def __aenter__(self): return self async def __aexit__(self, *e): return True async def foo(): nonlocal CNT async with CM() as cm: self.assertIs(cm.__class__, CM) raise RuntimeError run_async(foo()) def test_with_13(self): CNT = 0 class CM: async def __aenter__(self): 1/0 async def __aexit__(self, *e): return True async def foo(): nonlocal CNT CNT += 1 async with CM(): CNT += 1000 CNT += 10000 with self.assertRaises(ZeroDivisionError): run_async(foo()) self.assertEqual(CNT, 1) def test_for_1(self): aiter_calls = 0 class AsyncIter: def __init__(self): self.i = 0 def __aiter__(self): nonlocal aiter_calls aiter_calls += 1 return self async def __anext__(self): self.i += 1 if not (self.i % 10): await AsyncYield(self.i * 10) if self.i > 100: raise StopAsyncIteration return self.i, self.i buffer = [] async def test1(): async for i1, i2 in AsyncIter(): buffer.append(i1 + i2) yielded, _ = run_async(test1()) # Make sure that __aiter__ was called only once self.assertEqual(aiter_calls, 1) self.assertEqual(yielded, [i * 100 for i in range(1, 11)]) self.assertEqual(buffer, [i*2 for i in range(1, 101)]) buffer = [] async def test2(): nonlocal buffer async for i in AsyncIter(): buffer.append(i[0]) if i[0] == 20: break else: buffer.append('what?') buffer.append('end') yielded, _ = run_async(test2()) # Make sure that __aiter__ was called only once self.assertEqual(aiter_calls, 2) self.assertEqual(yielded, [100, 200]) self.assertEqual(buffer, [i for i in range(1, 21)] + ['end']) buffer = [] async def test3(): nonlocal buffer async for i in AsyncIter(): if i[0] > 20: continue buffer.append(i[0]) else: buffer.append('what?') buffer.append('end') yielded, _ = run_async(test3()) # Make sure that __aiter__ was called only once self.assertEqual(aiter_calls, 3) self.assertEqual(yielded, [i * 100 for i in range(1, 11)]) self.assertEqual(buffer, [i for i in range(1, 21)] + ['what?', 'end']) def test_for_2(self): tup = (1, 2, 3) refs_before = sys.getrefcount(tup) async def foo(): async for i in tup: print('never going to happen') with self.assertRaisesRegex( TypeError, "async for' requires an object.*__aiter__.*tuple"): run_async(foo()) self.assertEqual(sys.getrefcount(tup), refs_before) def test_for_3(self): class I: def __aiter__(self): return self aiter = I() refs_before = sys.getrefcount(aiter) async def foo(): async for i in aiter: print('never going to happen') with self.assertRaisesRegex( TypeError, r"that does not implement __anext__"): run_async(foo()) self.assertEqual(sys.getrefcount(aiter), refs_before) def test_for_4(self): class I: def __aiter__(self): return self def __anext__(self): return () aiter = I() refs_before = sys.getrefcount(aiter) async def foo(): async for i in aiter: print('never going to happen') with self.assertRaisesRegex( TypeError, "async for' received an invalid object.*__anext__.*tuple"): run_async(foo()) self.assertEqual(sys.getrefcount(aiter), refs_before) def test_for_6(self): I = 0 class Manager: async def __aenter__(self): nonlocal I I += 10000 async def __aexit__(self, *args): nonlocal I I += 100000 class Iterable: def __init__(self): self.i = 0 def __aiter__(self): return self async def __anext__(self): if self.i > 10: raise StopAsyncIteration self.i += 1 return self.i ############## manager = Manager() iterable = Iterable() mrefs_before = sys.getrefcount(manager) irefs_before = sys.getrefcount(iterable) async def main(): nonlocal I async with manager: async for i in iterable: I += 1 I += 1000 with warnings.catch_warnings(): warnings.simplefilter("error") # Test that __aiter__ that returns an asynchronous iterator # directly does not throw any warnings. run_async(main()) self.assertEqual(I, 111011) self.assertEqual(sys.getrefcount(manager), mrefs_before) self.assertEqual(sys.getrefcount(iterable), irefs_before) ############## async def main(): nonlocal I async with Manager(): async for i in Iterable(): I += 1 I += 1000 async with Manager(): async for i in Iterable(): I += 1 I += 1000 run_async(main()) self.assertEqual(I, 333033) ############## async def main(): nonlocal I async with Manager(): I += 100 async for i in Iterable(): I += 1 else: I += 10000000 I += 1000 async with Manager(): I += 100 async for i in Iterable(): I += 1 else: I += 10000000 I += 1000 run_async(main()) self.assertEqual(I, 20555255) def test_for_7(self): CNT = 0 class AI: def __aiter__(self): 1/0 async def foo(): nonlocal CNT async for i in AI(): CNT += 1 CNT += 10 with self.assertRaises(ZeroDivisionError): run_async(foo()) self.assertEqual(CNT, 0) def test_for_8(self): CNT = 0 class AI: def __aiter__(self): 1/0 async def foo(): nonlocal CNT async for i in AI(): CNT += 1 CNT += 10 with self.assertRaises(ZeroDivisionError): with warnings.catch_warnings(): warnings.simplefilter("error") # Test that if __aiter__ raises an exception it propagates # without any kind of warning. run_async(foo()) self.assertEqual(CNT, 0) def test_for_11(self): class F: def __aiter__(self): return self def __anext__(self): return self def __await__(self): 1 / 0 async def main(): async for _ in F(): pass with self.assertRaisesRegex(TypeError, 'an invalid object from __anext__') as c: main().send(None) err = c.exception self.assertIsInstance(err.__cause__, ZeroDivisionError) def test_for_tuple(self): class Done(Exception): pass class AIter(tuple): i = 0 def __aiter__(self): return self async def __anext__(self): if self.i >= len(self): raise StopAsyncIteration self.i += 1 return self[self.i - 1] result = [] async def foo(): async for i in AIter([42]): result.append(i) raise Done with self.assertRaises(Done): foo().send(None) self.assertEqual(result, [42]) def test_for_stop_iteration(self): class Done(Exception): pass class AIter(StopIteration): i = 0 def __aiter__(self): return self async def __anext__(self): if self.i: raise StopAsyncIteration self.i += 1 return self.value result = [] async def foo(): async for i in AIter(42): result.append(i) raise Done with self.assertRaises(Done): foo().send(None) self.assertEqual(result, [42]) def test_comp_1(self): async def f(i): return i async def run_list(): return [await c for c in [f(1), f(41)]] async def run_set(): return {await c for c in [f(1), f(41)]} async def run_dict1(): return {await c: 'a' for c in [f(1), f(41)]} async def run_dict2(): return {i: await c for i, c in enumerate([f(1), f(41)])} self.assertEqual(run_async(run_list()), ([], [1, 41])) self.assertEqual(run_async(run_set()), ([], {1, 41})) self.assertEqual(run_async(run_dict1()), ([], {1: 'a', 41: 'a'})) self.assertEqual(run_async(run_dict2()), ([], {0: 1, 1: 41})) def test_comp_2(self): async def f(i): return i async def run_list(): return [s for c in [f(''), f('abc'), f(''), f(['de', 'fg'])] for s in await c] self.assertEqual( run_async(run_list()), ([], ['a', 'b', 'c', 'de', 'fg'])) async def run_set(): return {d for c in [f([f([10, 30]), f([20])])] for s in await c for d in await s} self.assertEqual( run_async(run_set()), ([], {10, 20, 30})) async def run_set2(): return {await s for c in [f([f(10), f(20)])] for s in await c} self.assertEqual( run_async(run_set2()), ([], {10, 20})) def test_comp_3(self): async def f(it): for i in it: yield i async def run_list(): return [i + 1 async for i in f([10, 20])] self.assertEqual( run_async(run_list()), ([], [11, 21])) async def run_set(): return {i + 1 async for i in f([10, 20])} self.assertEqual( run_async(run_set()), ([], {11, 21})) async def run_dict(): return {i + 1: i + 2 async for i in f([10, 20])} self.assertEqual( run_async(run_dict()), ([], {11: 12, 21: 22})) async def run_gen(): gen = (i + 1 async for i in f([10, 20])) return [g + 100 async for g in gen] self.assertEqual( run_async(run_gen()), ([], [111, 121])) def test_comp_4(self): async def f(it): for i in it: yield i async def run_list(): return [i + 1 async for i in f([10, 20]) if i > 10] self.assertEqual( run_async(run_list()), ([], [21])) async def run_set(): return {i + 1 async for i in f([10, 20]) if i > 10} self.assertEqual( run_async(run_set()), ([], {21})) async def run_dict(): return {i + 1: i + 2 async for i in f([10, 20]) if i > 10} self.assertEqual( run_async(run_dict()), ([], {21: 22})) async def run_gen(): gen = (i + 1 async for i in f([10, 20]) if i > 10) return [g + 100 async for g in gen] self.assertEqual( run_async(run_gen()), ([], [121])) def test_comp_4_2(self): async def f(it): for i in it: yield i async def run_list(): return [i + 10 async for i in f(range(5)) if 0 < i < 4] self.assertEqual( run_async(run_list()), ([], [11, 12, 13])) async def run_set(): return {i + 10 async for i in f(range(5)) if 0 < i < 4} self.assertEqual( run_async(run_set()), ([], {11, 12, 13})) async def run_dict(): return {i + 10: i + 100 async for i in f(range(5)) if 0 < i < 4} self.assertEqual( run_async(run_dict()), ([], {11: 101, 12: 102, 13: 103})) async def run_gen(): gen = (i + 10 async for i in f(range(5)) if 0 < i < 4) return [g + 100 async for g in gen] self.assertEqual( run_async(run_gen()), ([], [111, 112, 113])) def test_comp_5(self): async def f(it): for i in it: yield i async def run_list(): return [i + 1 for pair in ([10, 20], [30, 40]) if pair[0] > 10 async for i in f(pair) if i > 30] self.assertEqual( run_async(run_list()), ([], [41])) def test_comp_6(self): async def f(it): for i in it: yield i async def run_list(): return [i + 1 async for seq in f([(10, 20), (30,)]) for i in seq] self.assertEqual( run_async(run_list()), ([], [11, 21, 31])) def test_comp_7(self): async def f(): yield 1 yield 2 raise Exception('aaa') async def run_list(): return [i async for i in f()] with self.assertRaisesRegex(Exception, 'aaa'): run_async(run_list()) def test_comp_8(self): async def f(): return [i for i in [1, 2, 3]] self.assertEqual( run_async(f()), ([], [1, 2, 3])) def test_comp_9(self): async def gen(): yield 1 yield 2 async def f(): l = [i async for i in gen()] return [i for i in l] self.assertEqual( run_async(f()), ([], [1, 2])) def test_comp_10(self): async def f(): xx = {i for i in [1, 2, 3]} return {x: x for x in xx} self.assertEqual( run_async(f()), ([], {1: 1, 2: 2, 3: 3})) def test_nested_comp(self): async def run_list_inside_list(): return [[i + j async for i in asynciter([1, 2])] for j in [10, 20]] self.assertEqual( run_async(run_list_inside_list()), ([], [[11, 12], [21, 22]])) async def run_set_inside_list(): return [{i + j async for i in asynciter([1, 2])} for j in [10, 20]] self.assertEqual( run_async(run_set_inside_list()), ([], [{11, 12}, {21, 22}])) async def run_list_inside_set(): return {sum([i async for i in asynciter(range(j))]) for j in [3, 5]} self.assertEqual( run_async(run_list_inside_set()), ([], {3, 10})) async def run_dict_inside_dict(): return {j: {i: i + j async for i in asynciter([1, 2])} for j in [10, 20]} self.assertEqual( run_async(run_dict_inside_dict()), ([], {10: {1: 11, 2: 12}, 20: {1: 21, 2: 22}})) async def run_list_inside_gen(): gen = ([i + j async for i in asynciter([1, 2])] for j in [10, 20]) return [x async for x in gen] self.assertEqual( run_async(run_list_inside_gen()), ([], [[11, 12], [21, 22]])) async def run_gen_inside_list(): gens = [(i async for i in asynciter(range(j))) for j in [3, 5]] return [x for g in gens async for x in g] self.assertEqual( run_async(run_gen_inside_list()), ([], [0, 1, 2, 0, 1, 2, 3, 4])) async def run_gen_inside_gen(): gens = ((i async for i in asynciter(range(j))) for j in [3, 5]) return [x for g in gens async for x in g] self.assertEqual( run_async(run_gen_inside_gen()), ([], [0, 1, 2, 0, 1, 2, 3, 4])) async def run_list_inside_list_inside_list(): return [[[i + j + k async for i in asynciter([1, 2])] for j in [10, 20]] for k in [100, 200]] self.assertEqual( run_async(run_list_inside_list_inside_list()), ([], [[[111, 112], [121, 122]], [[211, 212], [221, 222]]])) def test_copy(self): async def func(): pass coro = func() with self.assertRaises(TypeError): copy.copy(coro) aw = coro.__await__() try: with self.assertRaises(TypeError): copy.copy(aw) finally: aw.close() def test_pickle(self): async def func(): pass coro = func() for proto in range(pickle.HIGHEST_PROTOCOL + 1): with self.assertRaises((TypeError, pickle.PicklingError)): pickle.dumps(coro, proto) aw = coro.__await__() try: for proto in range(pickle.HIGHEST_PROTOCOL + 1): with self.assertRaises((TypeError, pickle.PicklingError)): pickle.dumps(aw, proto) finally: aw.close() def test_fatal_coro_warning(self): # Issue 27811 async def func(): pass with warnings.catch_warnings(), \ support.catch_unraisable_exception() as cm: warnings.filterwarnings("error") coro = func() # only store repr() to avoid keeping the coroutine alive coro_repr = repr(coro) coro = None support.gc_collect() self.assertIn("was never awaited", str(cm.unraisable.exc_value)) self.assertEqual(repr(cm.unraisable.object), coro_repr) def test_for_assign_raising_stop_async_iteration(self): class BadTarget: def __setitem__(self, key, value): raise StopAsyncIteration(42) tgt = BadTarget() async def source(): yield 10 async def run_for(): with self.assertRaises(StopAsyncIteration) as cm: async for tgt[0] in source(): pass self.assertEqual(cm.exception.args, (42,)) return 'end' self.assertEqual(run_async(run_for()), ([], 'end')) async def run_list(): with self.assertRaises(StopAsyncIteration) as cm: return [0 async for tgt[0] in source()] self.assertEqual(cm.exception.args, (42,)) return 'end' self.assertEqual(run_async(run_list()), ([], 'end')) async def run_gen(): gen = (0 async for tgt[0] in source()) a = gen.asend(None) with self.assertRaises(RuntimeError) as cm: await a self.assertIsInstance(cm.exception.__cause__, StopAsyncIteration) self.assertEqual(cm.exception.__cause__.args, (42,)) return 'end' self.assertEqual(run_async(run_gen()), ([], 'end')) def test_for_assign_raising_stop_async_iteration_2(self): class BadIterable: def __iter__(self): raise StopAsyncIteration(42) async def badpairs(): yield BadIterable() async def run_for(): with self.assertRaises(StopAsyncIteration) as cm: async for i, j in badpairs(): pass self.assertEqual(cm.exception.args, (42,)) return 'end' self.assertEqual(run_async(run_for()), ([], 'end')) async def run_list(): with self.assertRaises(StopAsyncIteration) as cm: return [0 async for i, j in badpairs()] self.assertEqual(cm.exception.args, (42,)) return 'end' self.assertEqual(run_async(run_list()), ([], 'end')) async def run_gen(): gen = (0 async for i, j in badpairs()) a = gen.asend(None) with self.assertRaises(RuntimeError) as cm: await a self.assertIsInstance(cm.exception.__cause__, StopAsyncIteration) self.assertEqual(cm.exception.__cause__.args, (42,)) return 'end' self.assertEqual(run_async(run_gen()), ([], 'end')) def test_bpo_45813_1(self): 'This would crash the interpreter in 3.11a2' async def f(): pass with self.assertWarns(RuntimeWarning): frame = f().cr_frame frame.clear() def test_bpo_45813_2(self): 'This would crash the interpreter in 3.11a2' async def f(): pass gen = f() with self.assertWarns(RuntimeWarning): gen.cr_frame.clear() gen.close() def test_stack_in_coroutine_throw(self): # Regression test for https://github.com/python/cpython/issues/93592 async def a(): return await b() async def b(): return await c() @types.coroutine def c(): try: # traceback.print_stack() yield len(traceback.extract_stack()) except ZeroDivisionError: # traceback.print_stack() yield len(traceback.extract_stack()) coro = a() len_send = coro.send(None) len_throw = coro.throw(ZeroDivisionError) # before fixing, visible stack from throw would be shorter than from send. self.assertEqual(len_send, len_throw) @unittest.skipIf( support.is_emscripten or support.is_wasi, "asyncio does not work under Emscripten/WASI yet." ) class CoroAsyncIOCompatTest(unittest.TestCase): def test_asyncio_1(self): # asyncio cannot be imported when Python is compiled without thread # support asyncio = import_helper.import_module('asyncio') class MyException(Exception): pass buffer = [] class CM: async def __aenter__(self): buffer.append(1) await asyncio.sleep(0.01) buffer.append(2) return self async def __aexit__(self, exc_type, exc_val, exc_tb): await asyncio.sleep(0.01) buffer.append(exc_type.__name__) async def f(): async with CM() as c: await asyncio.sleep(0.01) raise MyException buffer.append('unreachable') loop = asyncio.new_event_loop() asyncio.set_event_loop(loop) try: loop.run_until_complete(f()) except MyException: pass finally: loop.close() asyncio.set_event_loop_policy(None) self.assertEqual(buffer, [1, 2, 'MyException']) class OriginTrackingTest(unittest.TestCase): def here(self): info = inspect.getframeinfo(inspect.currentframe().f_back) return (info.filename, info.lineno) def test_origin_tracking(self): orig_depth = sys.get_coroutine_origin_tracking_depth() try: async def corofn(): pass sys.set_coroutine_origin_tracking_depth(0) self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 0) with contextlib.closing(corofn()) as coro: self.assertIsNone(coro.cr_origin) sys.set_coroutine_origin_tracking_depth(1) self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 1) fname, lineno = self.here() with contextlib.closing(corofn()) as coro: self.assertEqual(coro.cr_origin, ((fname, lineno + 1, "test_origin_tracking"),)) sys.set_coroutine_origin_tracking_depth(2) self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 2) def nested(): return (self.here(), corofn()) fname, lineno = self.here() ((nested_fname, nested_lineno), coro) = nested() with contextlib.closing(coro): self.assertEqual(coro.cr_origin, ((nested_fname, nested_lineno, "nested"), (fname, lineno + 1, "test_origin_tracking"))) # Check we handle running out of frames correctly sys.set_coroutine_origin_tracking_depth(1000) with contextlib.closing(corofn()) as coro: self.assertTrue(2 < len(coro.cr_origin) < 1000) # We can't set depth negative with self.assertRaises(ValueError): sys.set_coroutine_origin_tracking_depth(-1) # And trying leaves it unchanged self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 1000) finally: sys.set_coroutine_origin_tracking_depth(orig_depth) def test_origin_tracking_warning(self): async def corofn(): pass a1_filename, a1_lineno = self.here() def a1(): return corofn() # comment in a1 a1_lineno += 2 a2_filename, a2_lineno = self.here() def a2(): return a1() # comment in a2 a2_lineno += 2 def check(depth, msg): sys.set_coroutine_origin_tracking_depth(depth) with self.assertWarns(RuntimeWarning) as cm: a2() support.gc_collect() self.assertEqual(msg, str(cm.warning)) orig_depth = sys.get_coroutine_origin_tracking_depth() try: msg = check(0, f"coroutine '{corofn.__qualname__}' was never awaited") check(1, "".join([ f"coroutine '{corofn.__qualname__}' was never awaited\n", "Coroutine created at (most recent call last)\n", f' File "{a1_filename}", line {a1_lineno}, in a1\n', f' return corofn() # comment in a1', ])) check(2, "".join([ f"coroutine '{corofn.__qualname__}' was never awaited\n", "Coroutine created at (most recent call last)\n", f' File "{a2_filename}", line {a2_lineno}, in a2\n', f' return a1() # comment in a2\n', f' File "{a1_filename}", line {a1_lineno}, in a1\n', f' return corofn() # comment in a1', ])) finally: sys.set_coroutine_origin_tracking_depth(orig_depth) def test_unawaited_warning_when_module_broken(self): # Make sure we don't blow up too bad if # warnings._warn_unawaited_coroutine is broken somehow (e.g. because # of shutdown problems) async def corofn(): pass orig_wuc = warnings._warn_unawaited_coroutine try: warnings._warn_unawaited_coroutine = lambda coro: 1/0 with support.catch_unraisable_exception() as cm, \ warnings_helper.check_warnings( (r'coroutine .* was never awaited', RuntimeWarning)): # only store repr() to avoid keeping the coroutine alive coro = corofn() coro_repr = repr(coro) # clear reference to the coroutine without awaiting for it del coro support.gc_collect() self.assertEqual(repr(cm.unraisable.object), coro_repr) self.assertEqual(cm.unraisable.exc_type, ZeroDivisionError) del warnings._warn_unawaited_coroutine with warnings_helper.check_warnings( (r'coroutine .* was never awaited', RuntimeWarning)): corofn() support.gc_collect() finally: warnings._warn_unawaited_coroutine = orig_wuc class UnawaitedWarningDuringShutdownTest(unittest.TestCase): # https://bugs.python.org/issue32591#msg310726 def test_unawaited_warning_during_shutdown(self): code = ("import asyncio\n" "async def f(): pass\n" "async def t(): asyncio.gather(f())\n" "asyncio.run(t())\n") assert_python_ok("-c", code) code = ("import sys\n" "async def f(): pass\n" "sys.coro = f()\n") assert_python_ok("-c", code) code = ("import sys\n" "async def f(): pass\n" "sys.corocycle = [f()]\n" "sys.corocycle.append(sys.corocycle)\n") assert_python_ok("-c", code) @support.cpython_only class CAPITest(unittest.TestCase): def test_tp_await_1(self): from _testcapi import awaitType as at async def foo(): future = at(iter([1])) return (await future) self.assertEqual(foo().send(None), 1) def test_tp_await_2(self): # Test tp_await to __await__ mapping from _testcapi import awaitType as at future = at(iter([1])) self.assertEqual(next(future.__await__()), 1) def test_tp_await_3(self): from _testcapi import awaitType as at async def foo(): future = at(1) return (await future) with self.assertRaisesRegex( TypeError, "__await__.*returned non-iterator of type 'int'"): self.assertEqual(foo().send(None), 1) if __name__=="__main__": unittest.main()