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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def recursive_chmod(path, mode=0755):
 """ Recursively change ``mode`` for given ``path``. Same as ``chmod -R mode``. Args: path (str):
 Path of the directory/file. mode (octal int, default 0755):
 New mode of the file. Warning: Don't forget to add ``0`` at the beginning of the numbers of `mode`, or `Unspeakable hOrRoRs` will be awaken from their unholy sleep outside of the reality and they WILL eat your soul (and your files). """

    passwd_reader.set_permissions(path, mode=mode)
    if os.path.isfile(path):
        return

    # recursively change mode of all subdirectories
    for root, dirs, files in os.walk(path):
        for fn in files + dirs:
            passwd_reader.set_permissions(os.path.join(root, fn), mode=mode)