Declare a function using definition of input

Declare a function using definition of input

1. The variable outside of this function is global

2. Before adding a value, the variable is 'none' which has no value yet

   • Use other functions such as random.radint
     • One may use return: statement to return a value
       • If needed, we could define a new function, which is inside of random.radint funciton
         • use print function, and use (+) to connect two strings together inside of the print function
           • After executing the function that was defined, we may call the function
       • Variables that are part of this function are local

3. The input might be a string