How can I normalize/collapse paths or URLs in Python in OS independent way?
Question: I tried to use `os.normpath` in order to convert
`http://example.com/a/b/c/../` to `http://example.com/a/b/` but it doesn't
work on Windows because it does convert the slash to backslash.


Answer: Here is how to do it

    
    
    >>> import urlparse
    >>> urlparse.urljoin("ftp://domain.com/a/b/c/d/", "../..")
    'ftp://domain.com/a/b/'
    >>> urlparse.urljoin("ftp://domain.com/a/b/c/d/e.txt", "../..")
    'ftp://domain.com/a/b/'    
    

Remember that `urljoin` consider a path/directory all until the last `/` \-
after this is the filename, if any.

Also, do not add a leading `/` to the second parameter, otherwise you will not
get the expected result.

`os.path` module is platform dependent but for file paths using only slashes
but not-URLs you could use `posixpath,normpath`.

