Not all of the dynamic
we all know,The method is put in the running instance。That is the result of the implementation of the method is based on the instance property came,The property is an example of the current state of change - we call it "dynamic"。
But really all it is dynamic? In fact, not,Some methods give results which will directly and according to your call,It does not need to change according to the change of the instance attribute-that is to say, it will produce a definite result anyway,We call such methods static methods,It is static。
Let's take a look:
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