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

Posted by Namrata Lamba
Namrata Lamba
1,347 Points

Removing integers

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.

lists.py 
messy_list = ["a", 2, 3, 1, False, [1, 2, 3]]
num1 = messy_list.pop(3)
messy_list.insert(0,num1)
for item in messy_list[:]:
    try :
        int(item)
    except ValueError:
        messy_list.remove(item)
# Your code goes below here

1 Answer

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

This is a rather clever approach to this challenge I've not seen before! Most folks just target each item to be removed with individual statements. But I see two issues:

  • ValueError won't be the only exception, you'll also need to catch TypeError
  • int() will successfully convert True into 0 without an error

A similar approach that might avoid these issues would be to make use of the type() function. :wink: