Code help Python 2 (List & Dictionaries)

#1

https://www.codecademy.com/courses/learn-python/lessons/a-day-at-the-supermarket/exercises/stocking-out-?action=resume_content_item
Hi,
On Python 2, chp 5 List & Dictionaries.
I don’t get where the “Item” variable is coming from for the Loop.
Thanks,
Regards,
Laki

image

#2

You need to call the function with an argument to pass to the parameter food: For example,

print(compute_bill(shopping_list))

Now, the list, shopping_list goes in wherever you see food, and item is the iterator variable that is used when that list is iterated over.

Note on nomenclature:

If you have a list, my_ list = [‘a’, ‘b’, ‘c’]

… then by the magic of Python’s for - in expression

for thing in my_list:
   print(item)

'''Output:
a
b
c
'''

… every time the loop executes, the variable thing is assigned a new value, in this case, first ‘a’, then ‘b’, then ‘c’.

Here, the list, my_list is referred to as the iterable object (or simply iterable), while the variable thing is referred to as the iteration variable.

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