Please i cant understand why this code doesn't run when I choose 2(-) as my operator but instead gives a 'num1' not defined

Question

#This is a simple calculator I'm trying to program as my first project in python
import sys
while True:
print('The choices/operations available are:')
print('type 1 for addition (+)')
print('type 2 for substraction (-)')
print('type 3 for multiplication (*)')
print('type 4 for division (/)')
print('type 5 for square root (^2)')
print('type 6 for remainder (%)')
print('type 0 to close (exit)')

choice=int(input('enter ur choice:'))
if choice==0:
sys.exit
elif choice==1:
num1=float(input('enter first number: '))
num2=float(input('enter second number:'))
result=num1 + num2
print(result)
if choice==2:
num1=float(input('enter first number:'))
num2=float(input('enter second number:'))
result=num1 - num2
print(result)

Answer 1

# Hint:
Why not put the number inputs outside then write your conditional statements. Like this:

choice = input('enter your choice')
num1 = float(input())
num2 = float(input())

If choice == this:
do that
elif choice == that:
do this......

This way you won't have to repeat yourself 😃😃
Hope it helps.

Answer 2

Thanks