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                # lambda表達式 # 17. `lambda`表達式 `lambda`表達式是一行函數。 它們在其他語言中也被稱為匿名函數。如果你不想在程序中對一個函數使用兩次,你也許會想用lambda表達式,它們和普通的函數完全一樣。 **原型** ~~~ lambda 參數:操作(參數) ~~~ **例子** ~~~ add = lambda x, y: x + y print(add(3, 5)) # Output: 8 ~~~ 這還有一些lambda表達式的應用案例,可以在一些特殊情況下使用: **列表排序** ~~~ a = [(1, 2), (4, 1), (9, 10), (13, -3)] a.sort(key=lambda x: x[1]) print(a) # Output: [(13, -3), (4, 1), (1, 2), (9, 10)] ~~~ **列表并行排序** ~~~ data = zip(list1, list2) data.sort() list1, list2 = map(lambda t: list(t), zip(*data)) ~~~
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