[issue9097] os.chdir(path) to return current dir

[anatoly techtonik]

anatoly techtonik added the comment:

"an anti-pattern" and "encouraging a bad habit" are subjective non-arguments as long as they fail to answer why.

With or without the helper you still write this code:

    prev = os.getcwd()
    os.chdir(SDKPATH)
    ...
    os.chdir(prev)

And because os.chdir() doesn't do anything high-level, there is no place for the multithreading warning.

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<http://bugs.python.org/issue9097>
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