Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Python Collections (2016, retired 2019) Lists Removing items from a list

Posted by aa114
aa114
1,697 Points

Coding Challenge

can some help me how to solve this one? hallenge Task 2 of 2 Great! Now use .remove() and/or del to remove the string, the boolean, and the list from inside of messy_list. When you're done, messy_list should have only integers in it.

Thanks.

lists.py 
messy_list = ["a", 2, 3, 1, False, [1, 2, 3]]

# Your code goes below here
messy_list.insert(0,messy_list.pop(3))

1 Answer

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

There are several valid approaches to this step. The "brute force" way is to just to delete (del) the items you don't want by directly referencing them using an index number. A more elegant way might be to create a loop that removes items based on their type. Either way will work when correctly implemented.

Decide on a method, give it a shot, and post your code if you have any trouble with it.

aa114
aa114
1,697 Points

Hello... would you share your answer version. Thanks

messy_list_2 = messy_list.copy()
for item in messy_list_2:
    if type(item) != type(1):
        messy_list.remove(item)
Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

I might do a slightly more compact version of the same thing:

for item in messy_list.copy():
    if type(item) != int:
        messy_list.remove(item)

But what I'd really do (though you may not have covered list comprehensions yet) would be this:

messy_list = [ n for n in messy_list if type(n)==int ]

Happy coding!