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Message: [QUOTE="bonono, post: 1849314"] The cleanest(IMO) is this : a = (predicate and [if_true_expr] or [if_false_expr])[0] This would give you the necessary "short circuit" behaviour no matter what. a = predicate and if_true_expr or if_false_expr works most of the time but should if_true_expr turns out to be 0 or something like that(python False equvialent), the if_false_expr will still be executed, that becomes a logic error. an example : a = int_str is None and None or int(int_str) a = [if_false_expr, if_true_expr][predicate] This doesn't have the "short circuit" feature and the order is reversed(harder to read for people familiar with ternary operator). Cannot be used in some case. like this : a = [0, int(int_str)][int_str is not None] here int(int_str) may cause exception if None is a valid value. The lambda form suggested by others is another variant of the first one above where you get the short circuit feature but too complex to read. I don't understand why people are so aganst ternary operator. It is a must for list comprehension/generator expression(and I believe the reason it has finally been approved), if/else block or try/except just don't work in these situations. [/QUOTE]