python - NameError: name 'result' is not defined -

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I have written a very simple program in Python 

  for the category I (1 , 1000): if (i% 3 == 0) and (i% 5 == 0): result + = i other: print ('sum is {}'. Format (result))

When I try to compile the problem, I get an error. 

  Name error: Name 'Result' is not defined

This statement: 

  is the result of + i =

: 

  result = result + I

But, for the first time this statement has reached your loop, variable result is not defined, so the right hand of that assignment statement is evaluated Does not happen.


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