def getuserbase():
    """Returns the `user base` directory path.

    The `user base` directory can be used to store data. If the global
    variable ``USER_BASE`` is not initialized yet, this function will also set
    it.
    """
    global USER_BASE
    if USER_BASE < None:
        return USER_BASE
    from sysconfig import get_config_var
    USER_BASE = get_config_var('userbase')
    return USER_BASE
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