Message400609
The following command still fails on the Python main branch on Linux:
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$ env -i =value ./python -c 'import pprint, os; pprint.pprint(os.environ); del os.environ[""]'
environ({'': 'value', 'LC_CTYPE': 'C.UTF-8'})
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/home/vstinner/python/main/Lib/os.py", line 689, in __delitem__
unsetenv(encodedkey)
^^^^^^^^^^^^^^^^^^^^
OSError: [Errno 22] Invalid argument
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'del os.environ[""]' calls unsetenv("") which fails with EINVAL.
Python is a thin wrapper to C functions setenv() and unsetenv(), and raises an exception when a C function fails. It works as expected.
Python exposes the variable with an empty name which is found in the environment variables: again, it works as expected.
I don't see how Python could do better, since the glibc unsetenv() fails with EINVAL if the string is empty. It is even a documented behaviour, see the unsetenv() manual page:
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ERRORS
EINVAL name is NULL, points to a string of length 0, or contains an '=' character.
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Date |
User |
Action |
Args |
2021-08-30 14:22:24 | vstinner | set | recipients:
+ vstinner, pefu, blueyed, ned.deily, Arfrever, akira, serhiy.storchaka, iritkatriel |
2021-08-30 14:22:24 | vstinner | set | messageid: <1630333344.31.0.19426044089.issue20658@roundup.psfhosted.org> |
2021-08-30 14:22:24 | vstinner | link | issue20658 messages |
2021-08-30 14:22:24 | vstinner | create | |
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