Here is the solution to Calculator using functions in Python which is given below:

def main():

x = float(input("Input first number: "))

y = float(input("Input second number: "))

```
print("Addition: {0:.2f}".format(x + y))
print("Subtraction: {0:.2f}".format(x - y))
print("Multiplication: {0:.2f}".format(x * y))
print("Division: {0:.2f}".format(x / y))
```

if **name** == ‘**main**’:

main()