Remove a list inside a list

Question

I want to remove the list [1,2,3] inside the outer list. I tried or isinstance(item, list) but that didn't work, the nested list was still there.

messy_list = ["a", 2, 3, 1, False, [1, 2, 3]]

# Your code goes below here
messy_list.pop(3)
messy_list.insert(0,1)

for item in messy_list:
    if isinstance(item, str) or isinstance(item, bool):
        messy_list.remove(item)

messy_list.pop(-1)

print(messy_list)

I would like to know if there wasn't a better way to check if there's a list inside the list, and then remove from the outer list, instead of having to hardcode it with .pop(-1)

Solution

Will remove ALL inner lists:

messy_list = ["a", 2, 3, 1, False, [1, 2, 3]] 

cleaned = [item for item in messy_list if not isinstance(item,list)]

print(cleaned)

I am using a list comprehension that inspects all items of your messy_list and only adds it to the resulting new list if it is not a list itself.