Returning Values¶

Let us understand more about returning values to the caller.

We typically have one or more return statements inside the function body.
The statement return exits a function, we can return back an expression or variable or object to the caller. A return statement with no expression is the same as return None.
If there is no return statement in the function body then the function returns None object.
We can return multiple expressions in Python.

def get_commission_amount(sales_amount, commission_pct):
    """Function to compute commission amount. commission_pct should be passed as percent notation (eg: 20%)
       20% using percent notation is equal to 0.20 in decimal notation.
    """
    commission_amount = (sales_amount * commission_pct / 100) if commission_pct else 0
    return commission_amount

get_commission_amount(1000, 20)

200.0

def get_phone_count(employee_id: int, phone_numbers: list):
    valid_count = 0
    invalid_count = 0
    for phone_number in phone_numbers:
        if len(phone_number) != 10:
            invalid_count += 1
        else:
            valid_count += 1
    return valid_count, invalid_count

get_phone_count(1, ['1234567890', '245 789 1234', '+1 156 290 1489'])

(1, 2)

Mastering Python

Returning Values¶