Scope

Variables have a certain reach within a program. A global variable can be used anywhere in a program, but a local variable is known only in a certain area (function, loop)

Example:

#!/usr/bin/env python3

balance = 0

def addAmount(x):
    global balance
    balance = balance + x

addAmount(5)
print(balance)

In the program above, balance is a global variable. It can be used anywhere in the code. But the variable x can only be used inside addAmount.

Study drill

Try the exercises below:

1. Add a function reduce amount that changes the variable balance

After completing these continue with the next exercise.

Multiple return
Time and date