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GeezerVison is showing github.com — itertools.chain should evaluate lazily · Issue #3787 · RustPython/RustPython

itertools.chain should evaluate lazily #3787

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#3788
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itertools.chain should evaluate lazily#3787
#3788
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@rng-dynamics
rng-dynamics
opened on Jun 14, 2022
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CPython:

>>> from itertools import *
>>> a = chain.from_iterable(repeat(range(2)))
>>> next(a)
0
>>> next(a)
1
>>> next(a)
0

RustPython does not evaluate lazily and the call to from_iterable never returns:

>>>>> from itertools import *
>>>>> a = chain.from_iterable(repeat(range(2)))
Reacted by Jeong, YunWon

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  1. youknowone commented on Jun 14, 2022

    @youknowone
    youknowone
    on Jun 14, 2022
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    This test looks missing in CPython

    python/cpython#93815

  2. youknowone commented on Jun 14, 2022

    @youknowone
    youknowone
    on Jun 14, 2022
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    Ok, they are not interested in it. We will add it to extra_tests/snippets/stdlib_itertools.py.

  3. rng-dynamics commented on Jun 14, 2022

    @rng-dynamics
    rng-dynamics
    on Jun 14, 2022
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    Ok, they are not interested in it. We will add it to extra_tests/snippets/stdlib_itertools.py.

    In #3788 I added a similar test.

  4. youknowone
    closed this as completedin #3788on Jun 15, 2022
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