Python If Elif
Elif
elif 关键字是 Python 的一种方式，表示“如果前面的条件不成立，则尝试此条件”。
在这个例子中，a 等于 b，所以第一个条件不成立，但 elif 条件成立，所以我们在屏幕上打印“a 和 b 相等”。
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