python path separator

[swapnil]

I could not find any documentation for variables os.path.sep and
os.path.altsep. Although the first is pretty straightforward can
anyone explain the purpose of the second variable? Is it even useful?
According to issue http://bugs.python.org/issue709428, os.path.altsep
was 'None' till a long time and it didn't bother anyone?
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