Petr Viktorin added the comment:
Not true (on 3.3 & 2.7).
>>> import sys
>>> import x
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/tmp/x.py", line 1, in <module>
import y
File "/tmp/y.py", line 1, in <module>
1/0
ZeroDivisionError: division by zero
>>> sys.modules['x']
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError: 'x'
>>> sys.modules['y']
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError: 'y'
For 3.4, PEP 451 explicitly specifies ``del sys.modules[spec.name]`` if
``loader.exec_module`` fails [0].
[0] https://www.python.org/dev/peps/pep-0451/#how-loading-will-work
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<http://bugs.python.org/issue24081>
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