def get_persistent_rep(env=None):
    """Return `(rep, args, imports)`.

        Define a persistent representation `rep` of the instance self where
        the instance can be reconstructed from the string rep evaluated in the
        context of dict args with the specified imports = list of `(module,
        iname, uiname)` where one has either `import module as uiname`, `from
        module import iname` or `from module import iname as uiname`.
        """
