python - Why is this list not 'saving' after I execute the function? -

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So I'm only coding for a few weeks and today, I was messing around writing an algorithm in Python The list that fills the empty list. I have written this: 

  def wth (a, b): list = [] i = 0 j = b while len (list) & lt; A: list.insert (i, j) i = I + 1J = J + 1 return list

This works, for example: 

 < [10, 11, 12] However, if I want to keep this list and want to do something for it, then it just returns to an empty list: [13] 14, 15, 16, 17, 18, 19]  

  print list []

Why is it so? Many thanks in advance.

If you want to use the result of a function, you must assign it to

Instead of this code, you can simply use for a variable like 

  new_list = wth (a, b)  b)

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