itertools.chain should evaluate lazily #3787

rng-dynamics · 2022-06-14T07:11:48Z

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)))

The text was updated successfully, but these errors were encountered:

youknowone · 2022-06-14T15:32:50Z

This test looks missing in CPython

python/cpython#93815

youknowone · 2022-06-14T16:53:42Z

Ok, they are not interested in it. We will add it to extra_tests/snippets/stdlib_itertools.py.

rng-dynamics · 2022-06-14T19:02:39Z

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.

rng-dynamics mentioned this issue Jun 14, 2022

Fix itertools chain #3788

Merged

youknowone mentioned this issue Jun 14, 2022

test_itertools.py does not test infinite iterable for itertools.chain.from_iterable python/cpython#93814

Closed

youknowone closed this as completed in #3788 Jun 15, 2022

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

itertools.chain should evaluate lazily #3787

itertools.chain should evaluate lazily #3787

itertools.chain should evaluate lazily #3787

itertools.chain should evaluate lazily #3787

Comments