forked from Lephenixnoir/PythonExtra
3f6ffe059f
This commit implements PEP479 which disallows raising StopIteration inside a generator to signal that it should be finished. Instead, the generator should simply return when it is complete. See https://www.python.org/dev/peps/pep-0479/ for details.
61 lines
1 KiB
Python
61 lines
1 KiB
Python
def gen1():
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yield 1
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yield 2
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# Test that it's possible to close just created gen
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g = gen1()
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print(g.close())
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try:
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next(g)
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except StopIteration:
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print("StopIteration")
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# Test that it's possible to close gen in progress
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g = gen1()
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print(next(g))
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print(g.close())
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try:
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next(g)
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print("No StopIteration")
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except StopIteration:
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print("StopIteration")
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# Test that it's possible to close finished gen
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g = gen1()
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print(list(g))
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print(g.close())
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try:
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next(g)
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print("No StopIteration")
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except StopIteration:
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print("StopIteration")
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# Throwing GeneratorExit in response to close() is ok
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def gen2():
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try:
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yield 1
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yield 2
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except:
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print('raising GeneratorExit')
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raise GeneratorExit
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g = gen2()
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next(g)
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print(g.close())
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# Any other exception is propagated to the .close() caller
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def gen3():
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try:
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yield 1
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yield 2
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except:
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raise ValueError
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g = gen3()
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next(g)
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try:
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print(g.close())
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except ValueError:
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print("ValueError")
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