conditional import X.Y causes false positive possibly-used-before-assignment

[jwilk]

Bug description

if input():
    import os.path
else:
    os = None
if os:
    pass

Command used

$ pylint -E condimport.py 

Pylint output

condimport.py:5:3: E0606: Possibly using variable 'os' before assignment (possibly-used-before-assignment)

Expected behavior

The os variable is set in both branches, so no error should be reported.

Pylint version

pylint 3.3.1
astroid 3.3.5
Python 3.13.0 (main, Oct  8 2024, 08:51:27) [GCC 9.4.0]