Calculator B

x = '1 + 2'
y = x.split()
print(y)
a = float(y[0])
b = y[1]
c = float(y[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")