python - How to add a number to a certain index in a list? -

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  list = [4, 7, 5, 3]

This list, I think, is the index of 0 in number 4, 1 in 5, 2 has 2 and 3 of 3, but how do I add a value to a personal index? 

  (list [1] + 1) I thought that the above will have to do this when I print the list:  
  print (list) [4, 8, 5, 3]

You are required to actually provide a value with = , so once you have removed the result with this addition): 

  list [ 1] + = 1 # Short list [1] = List [1] + 1

Integers are unchanging , so that you can place them in place Can not be modified. You have to allocate the name again to change its value - so here we allocate a new number which is greater than the last of 1.

Now it works with the demo: 

  & gt; & Gt; & Gt; List 1 = [4, 7, 5, 3]> gt; & Gt; & Gt; List 1 [1] + = 1> & gt; & Gt; & Gt; Print (List 1) [4, 8, 5, 3]

do not name only a variable list , this is the underlying mask


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