Calculator

a=1
b='x'
c=2
if (type(a) == int or type(a) == float) and (b in ['+','-','x','/']):
    if (type(c) == int or type(c) == float):
        if b=='+':
            result = a + c
        if b == '-':
            result = a - c
        if b == 'x':
            result = a * c
        if b == '/':
            result = a/c
        print(result)
else:
    print("input error")