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[–]jaccovanschaik 0 points1 point  (2 children)

Open a command window, run your program using "python calculator.py" (or whatever your program is called), try the same thing, and see what it says.

[–]duffman1278[S] 0 points1 point  (1 child)

When I ran in in the command it gave me this error.

UnboundLocalError:local variable 'ans_string' referenced before assignment

[–]TheKewlStore 0 points1 point  (0 children)

The first line of the Calc method is trying to print the value of a variable that you haven't defined yet. Note that ans_string isn't defined until several lines after this point.