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__str__ if you print an object, or pass it to format, str.format, or str, then if a __str__ method is defined, that method will be called, otherwise, __repr__ will be used. Str ()的底层实际是下面两个特殊方法，它会根据情况调用其中的一个： __str__默认的首选方法。 __repr__，一个备胎，在没有__str__方法时使用它。 我们把上面的类改写为： What are the differences between them, and when should one be used over the other?

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Use __str__ if you have a class, and you'll want an.

In your example, you function is expecting ham of type str, and eggs of type str (defaulting to eggs).

Why does rust have both string and str? 背景 str（short tandem repeat，短串联重复序列）是指dna序列中存在的一种特殊模式，即一串较短的核苷酸序列重复排列。 在个体身份鉴定方面，str检测被广泛应用于法医学领域，.

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