Is something wrong with the indentation?
while True: print('My Python Calculator..') input('This is just a simple calculator that does basic maths. Press the enter button to proceed to the OPTION MENU...') print('Options :') print('Enter the "+" button to add:') print('Enter the "-" to subtract:') print('Enter the "/" to divide:') print('Enter the "quit" button to exit the program:') user_input=input(' : ') if user_input=="quit": break if user_input=="+": num=float(input('Enter a number: ')) num2=float(input('Enter another number: ')) result=num + num2 print('Your answer is', result) if user_input=="-": num=float(input('Enter a number: ')) num2=float(input('Enter another number: ')) result=num - num2 print('Your answer is', result) if user_input=="/": num=float(input('Enter a number: ')) num2=float(input('Enter another number: ')) result=num / num2 print('Your answer is', result) else: print('Unknown input')