x = int(input("Enter a number: "))
y = int(input("Enter a number: "))

print((x+y))

Enter a number: one



---------------------------------------------------------------------------

ValueError                                Traceback (most recent call last)

<ipython-input-2-d1355a0ae898> in <module>()
----> 1 x = int(input("Enter a number: "))
      2 y = int(input("Enter a number: "))
      3 
      4 print((x+y))


ValueError: invalid literal for int() with base 10: 'one'

# As you see above, python will throw error if you type anything other than number

x = int(input("Enter a number: "))
y = int(input("Enter a number: "))

print((x+y))

Enter a number: 5
Enter a number: 6
11