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Python Functional Python The Lambda Lambada Reduce

Posted by Tafadzwa Timothy Gakaka
Tafadzwa Timothy Gakaka
10,978 Points

Functional Python

We have a bunch of prices and sales numbers and we need to find out our total earnings.

Let's start by writing a function named product_sales that takes a single two-member tuple made up of a price and a number of units sold. product_sales should return the product of the price and the number of units.

help im lost

prices.py 
prices = [
    (6.99, 5),
    (2.94, 15),
    (156.99, 2),
    (99.99, 4),
    (1.82, 102)
]
def product_sales((price, unit)):
    price, unit = passed_tuple

1 Answer

Megan Amendola
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STAFF
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Megan Amendola
Treehouse Teacher
Megan Amendola
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Megan Amendola
Treehouse Teacher

Hi! Let me break this down.

  • Let's start by writing a function named product_sales - check! This is correct
  • that takes a single two-member tuple - you should have a single argument in your function, right now you have two inside of a set of extra parentheses
def product_sales(passed_tuple):
  • made up of a price and a number of units sold. - the tuple that is going to be passed in will be made up of these two values
  • product_sales should return the product of the price and the number of units. - you should return the product (*) of the two values that are inside of the tuple
def product_sales(passed_tuple):
    price, units = passed_tuple
    return price * units

I hope this helps!