import operator import sys
ops = {"+": operator.add, "-": operator.sub, '*': operator.mul, '/': operator.truediv, }
def calculation():
while True:
calculation_input = input('Enter an operation: ')
if calculation_input == '+' or calculation_input == '-' or calculation_input == '*' or calculation_input == '/':
return cal(calculation_input)
break
def isint(value): try: int(value) return True except: return False
def cal(calculation):
while True:
number_2 = input('Enter another number: ')
if isint(number_2):
number_2 = int(number_2)
result = ops[calculation](number_1, number_2)
print('Result:', result)
print(' ')
calculation1()
else:
print ("This is not a number.")
cal(calculation)
break
def calculation1(): while True: number_1 = input('Enter number (or a letter to exit): ') if isint(number_1): number_1 = int(number_1) calculation() else: sys.exit(0)
while True: number_1 = input('Enter number (or a letter to exit): ') if isint(number_1): number_1 = int(number_1) calculation() else: break
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