I don’t know if the link below will take you to the problem I’m having an issue with but if it does not I
have a screenshot
https://www.codecademy.com/paths/build-python-web-apps-flask/tracks/flask-python-data-structures-loops/modules/learn-python3-lists/projects/python-lens-slice
What I would like to know is, is there a way to get the output of what I circled in the picture?
I added the list using the “+” operation and that didn’t work. Based off what was taught in python 3 so far there was not a way to get the result I circled in the picture unless I manually make the list myself like this
pizza_and_prices = [2, ‘pepperoni’]
[prices + toppings] = failed
[prices, toppings] = failed
You will learn about it in later lessons, but there are two ways to do what you want; both involve using the zip() function.
The first method will produce a list of tuples when using zip() by itself. If you want a list of lists, then you can combine zip() with list comprehension
toppings = ["pepperoni", "pineapple", "cheese", "sausage", "olives", "anchovies", "mushrooms"]
prices = [2, 6, 1, 3, 2, 7, 2]
# Method 1 using standalone zip
pizza_and_prices_using_zip = list(zip(prices, toppings))
print("Using standalone zip method:")
print(pizza_and_prices_using_zip)
print()
# Method 2 using zip with list comprehension
pizza_and_prices_with_list_comprehension = [list(element) for element in zip(prices, toppings)]
print("Using zip with list comprehension:")
print(pizza_and_prices_with_list_comprehension)
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maybe a list comprehension is what you’re looking for.
prices_and_pizzas = [ [prices[i], pizzas[i]] for i in range(len(pizzas)) ]
I guess you could do that with a loop instead.
prices_of_pizzas = []
length = len(pizzas)
for i in range(length):
prices_of_pizzas.append( [prices[i], pizzas[i]] )
print(prices_of_pizzas[0]) #// print first list in prices_of_pizzas list of lists
1 Like
Yes, you are correct. I had to take a break for this one, but it shouldn’t be asked if it hasn’t been shown. It could be something don’t know so I’ll go back and see if I can report that section and I guess we’ll see if they’ll make any changes.
Thank you!
This project used to use .zip() but it was then revised & .zip() was removed. The copyediting could have been handled better in the project. I don’t know if list comprehensions are covered prior to this either…
