Message314533
In addition to Xiang Zhang's comments, this is neither a feature nor a bug, but a misunderstanding. This has nothing to do with strings or underscores:
py> L = [1, 2, 3, 4, 5]
py> for item in L:
... L.remove(item)
...
py> L
[2, 4]
When you modify a list as you iterate over it, the results can be unexpected. Don't do it.
If you *must* modify a list that you are iterating over, you must do so backwards, so that you are only removing items from the end, not the beginning of the list:
py> L = [1, 2, 3, 4, 5]
py> for i in range(len(L)-1, -1, -1):
... L.remove(L[i])
...
py> L
[]
But don't do that: it is nearly always must faster to make a copy of the list containing only the items you wish to keep, then assign back to the list using slicing. A list comprehension makes this an easy one-liner:
py> L = [1, 2, 3, 4, 5]
py> L[:] = [x for x in L if x > 4]
py> L
[5] |
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Date |
User |
Action |
Args |
2018-03-27 15:33:44 | steven.daprano | set | recipients:
+ steven.daprano, xiang.zhang, yemiteliyadu |
2018-03-27 15:33:44 | steven.daprano | set | messageid: <1522164824.54.0.467229070634.issue33157@psf.upfronthosting.co.za> |
2018-03-27 15:33:44 | steven.daprano | link | issue33157 messages |
2018-03-27 15:33:44 | steven.daprano | create | |
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