[New-bugs-announce] [issue43450] List amnesia

[Márcio Mocellin]

New submission from Márcio Mocellin <marciomocellin at gmail.com>:

In Python 3.6.8 (default, Apr 16 2020, 01:36:27) [GCC 8.3.1 20191121 (Red Hat 8.3.1-5)] on linux, when I materialize the list, it is shown and is deleted. Shouldn't the list persist in memory? Is this a bug or is it really?

```python
>>> vet_neg
['EH01', 'EH02', 'EH03']
Categories (3, object): ['EH01', 'EH02', 'EH03']
>>> cenarios
[0, 1]
>>> vet_neg_cenarios = itertools.product(vet_neg, cenarios, cenarios)
>>> vet_neg_cenarios
<itertools.product object at 0x7f6fa16a65e8>
>>> list(vet_neg_cenarios)
[('EH01', 0, 0), ('EH01', 0, 1), ('EH01', 1, 0), ('EH01', 1, 1), ('EH02', 0, 0), ('EH02', 0, 1), ('EH02', 1, 0), ('EH02', 1, 1), ('EH03', 0, 0), ('EH03', 0, 1), ('EH03', 1, 0), ('EH03', 1, 1)]
>>> list(vet_neg_cenarios)
[]
>>> 
```

----------
messages: 388372
nosy: marciomocellin
priority: normal
severity: normal
status: open
title: List amnesia
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43450>
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