1st Script written doesn't output anything. Need some else's eyes

[Kym]

Hi All,
I am 24 hours into Python37 coding using IDLE and have written a calculator script. The calc script should request 2 variables and what needs done with them +-*/. Nothing shows when I run it in Python, it doesn"t ask any of the questions. Script is written off a youtube lesson. Any help would be appreciated. Sorry, when I edit the text all the indents are there and when I save it they all disappear. Any reason for this?

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#returns the sum of num1 and num2 def add(num1, num2):     return num1 + num2   #returns sum of subtracting num1 and num2 def sub(num1, num2):     return num1 - num2   #returns sum of num1 * num2 def mul(num1, num2):     return num1 * num2   #returns sum of num1 / num2 def div(num1, num2):     return num1 / num2         def main(): #Shouldn't there be something between the brackets?(easier than writing parentisis)     operation = input("What do you want to do (+,-,*,/):")     if (operation != '+' and operation != '-' and operation != '*' and operation != '/'):         #invalid operation         print('You must enter a valid operation')     else:         var1 = int(input("Enter number1:"))         var2 = int(input("Enter number2:"))         if(operation == '+'):             print(add(var1,var2))         elif(operation == '-'):             print(sub(var1 - var2))         elif(operation =='*'):             print(mul(var1 * var2))         else:             print(div(var1 / var2))

[sparkz_alot]

In your "main" function, you need to change you're elif's to look like the "if" statement, you can also remove all the redundant parenthesis:

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if operation == '+':     print(add(var1, var2)) elif operation == '-':     print(sub(var1, var2)) elif operation == '*':     print(mul(var1, var2)) else:     print(div(var1, var2))

Then you need to call the function "main()". Add this to the end of your script:

1 2	if __name__ == "__main__":     main()

[Kym]

@sparkz_alot Thank you for the help. While I was frustrated over this problem, my mind kept telling me "There is a better way to do this" Am I imagine this or is the code a little lunky? Perhaps a little cleaner method?

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Is there any real reason to def main() at all?

[nilamo]

Is there any real reason to def main() at all?

So your file can safely be imported from a different file. Which is useful for testing, or if you're building a library.