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def _convert_key(key): return key def rmap(func, sequence): return [rmap(func, i) if isinstance(i, (tuple, list)) #elif isinstance(i, dict) ??? else func(i) for i in sequence] def func_replace(val): func, indexes = val indexes = rmap(_convert_key, indexes) try: return (lambda row: func(*rmap((lambda i: row[i]), indexes))) except TypeError: raise TypeError("Function %r is not callable" % (func)) good_lambda = func_replace((sum, ([1, 2, 3],))) bad_lambda = func_replace(('totally not a function', (1,2,4))) print(good_lambda) print(good_lambda([3,5,1,2,5])) print(bad_lambda) print(bad_lambda([3,5,1,2,5]))
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