Pycharm警告：Default Argument Value is mutable
我们在Python里写函数时，常常会给一些参数赋初始值。我们把这些初始值叫作Default Argument Values。 一般情况下，我们可以很自由的给参数赋初值，而不需要考虑任何异常的情况或者陷阱。 但是当你给这些参数赋值为可变对象（mutable object)，比如list，dictionary，很多类的实例时，那么你要小心了，因为函数参数 的初值只能被计算一次（在函数定义的时间里）。
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相关文章
- 1. non-default argument follows default argument：
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