Calc

##init var
##Calc by Anzo, it's shitty just training ty.
inp=0
ust=0
a=1
b=1
opt=["sum","substraction","multiplication","division"]
rst=[a+b,a-b,a*b,a/b]
r2t=["+","-","x","/"]
##Importing os for cls
import os
def cls():
    os.system('cls')
cls()
#OptionSelect
while True:
    cls()
    print("What options do you choose/nPress Enter to select, type 'C' to confirm")
    print(">>",opt[ust],"<<")
    ##debug
    print(ust)
    inp=input("")
    if inp=="C":break
    elif inp!="":continue
    if not ust>2:
        ust=ust+1
    else:ust=0
    #Garbage code
    #print("you chose "+str(opt[ust])+".")
    #input("Press Enter to continue")
##Calc
while True:
    cls()
    print("Input first number to calculate")
    try:
        a=int(input())
    except ValueError:continue
    break
##Calcstep2
while True:
    cls()
    print("Input second number to calculate")
    try:
        b=int(input(str(a)+r2t[ust]))
    except ValueError:continue
    break
#Result
while True:
    rst=[a+b,a-b,a*b,a/b]
    cls()
    print("the result of the "+str(opt[ust])+" is:")
    print(str(a)+str(r2t[ust])+str(b)+"="+str(rst[ust]))
    print("Press Enter to exit")
    input()
    break
#Bye