Can someone please tell me the reason behind this type error?

Was the input value "5 5"?  There is no way to make that an integer.

In Python print itself is a function. You assign the value print returns to the variable total_throws. This hint should be sufficient.

If you want to understand the error message, too: The print function usually returns None. The value None is the only object of the class NoneType.

help('NONE')