[issue10642] Improve the error message of addpackage() (site.py) for defective .pth file

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at haypocalc.com>:


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title: site.py crashes on python startup due to defective .pth file -> Improve the error message of addpackage() (site.py) for defective .pth file

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10642>
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