human
I wrote the below code

    if (len(tokens) == 1):
        return (lambda n, m=None, l=None: tokens[0](n, None, {}))
    tokens = [x for x in tokens if (x != u';')]
    macro_dict = {}
    macro_defs = [tok for tok in tokens if isinstance(tok, dict)]
    for macro_def in macro_defs:
        macro_dict.update(macro_def)
    tgrep_exprs = [tok for tok in tokens if (not isinstance(tok, dict))]
    def top_level_pred(n, m=macro_dict, l=None):
        label_dict = {}
        return any((predicate(n, m, label_dict) for predicate in tgrep_exprs))
    return top_level_pred

What's a good function header?
 Here's a good function header?
assistant
#Here's a good function header.

def _tgrep_exprs_action(_s, _l, tokens):