How to flatten list by python

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Flattening list

Sometimes we will encounter complex data structures, such as the list inside the list, layer by layer nesting, very troublesome. Methods that can be flattened:

Traditional methods

Comments: this is solved by recursion, the train of thought is very simple and clear, but recursion must have an exit, we should pay attention to it when designing.

In addition, there are two master writing methods, which are more complicated to understand. Here, you can look for those who are interested.

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