Copy if anyconfig.utils.get_file_extension is not available.

    >>> get_file_extension("/a/b/c")
    ''
    >>> get_file_extension("/a/b.txt")
    'txt'
    >>> get_file_extension("/a/b/c.tar.xz")
    'xz'

def get_file_extension(filepath):
    """
    Copy if anyconfig.utils.get_file_extension is not available.

    >>> get_file_extension("/a/b/c")
    ''
    >>> get_file_extension("/a/b.txt")
    'txt'
    >>> get_file_extension("/a/b/c.tar.xz")
    'xz'
    """
    _ext = os.path.splitext(filepath)[-1]
    if _ext:
        return _ext[1:] if _ext.startswith('.') else _ext

    return ''