Message353954
When changing a dict while iterating through it by removing one key and inserting other which is calculated based on the old one, the dict is changed unexpectedly.
The following function:
```
def test(d: dict):
for i in d:
d[i+1] = d.pop(i)
```
when called with input dict `{1: 'test'}` transforms the dict to:
- `{6: 'test'}` in Python3.7.4;
- `{8: 'test'}` in Python3.5.3 and Python2.7.
If I change the function to add 2 to the key ( `d[i+2] = d.pop(i)` ) and use the same input `{1: 'test'}` the dict is changed to:
- `{11: 'test'}` in Python3.7;
- `{9: 'test'}` in Python3.5.
Similar thing happens with strings:
```
def test(d: dict):
for i in d:
d[i+'x'] = d.pop(i)
```
When called with input dict `{'a': 'test'}` it transforms it to:
- `{'axxxxx': 'test'}` in Python3.7.4;
- `{'axx': 'test'}` in Python3.5.3. |
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Date |
User |
Action |
Args |
2019-10-04 16:54:45 | bboneva | set | recipients:
+ bboneva |
2019-10-04 16:54:45 | bboneva | set | messageid: <1570208085.28.0.0436589933875.issue38372@roundup.psfhosted.org> |
2019-10-04 16:54:45 | bboneva | link | issue38372 messages |
2019-10-04 16:54:45 | bboneva | create | |
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