Python 3.6.4: os.path.abspath (lines 537-554 in ntpath.py)

os.path.abspath.py

else:  # use native Windows method on Windows
    def abspath(path):
        """Return the absolute version of a path."""

        if path: # Empty path must return current working directory.
            path = os.fspath(path)
            try:
                path = _getfinalpathname(path).replace('\\\\?\\', '')
            except OSError:
                pass # Bad path - return unchanged.
        elif isinstance(path, bytes):
            path = os.getcwdb()
        else:
            path = os.getcwd()
        return normpath(path)

# realpath is a no-op on systems without islink support
realpath = abspath