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How does the code work [I for i in Range (51) if I % 2 == 0]?

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  Evens_to_50 = [I  for  i  in   range  ( 51 )  if  i %  2  ==  0 ]   Print  Evens_to_50    
 This code generates a list of even numbers up to fifty. But I, as new in programming, do not understand some points -: 
  
      
  1.  Why the generation occurs in square brackets, they are usually used when working with indices 
    2.   
  2.  What does the first  i  do  for ? Why after  range (51)  there are no colonies and transfer to a new line with tabulation? 
    3.   
  3.  Where else can square brackets be used in Python besides lists and indexing? 
    4.
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