NBC Sports on MSN: Ranking the 2026 Masters field: Full list of all 91 players at Augusta National FOX Sports on MSN: The Stage is Set! Complete List of All 48 World Cup Teams Ranking the 2026 Masters field: Full list of all 91 players at Augusta National The Stage is Set! Complete List of All 48 World Cup Teams The first, [:], is creating a slice (normally often used for getting just part of a list), which happens to contain the entire list, and thus is effectively a copy of the list.

Understanding the Context

The second, list(), is using the actual list type constructor to create a new list which has contents equal to the first list. Is there a way in Python to list all installed packages and their versions? I know I can go inside python/Lib/site-packages and see what files and directories exist, but I find this very awkward. ...

Key Insights

When reading, list is a reference to the original list, and list[:] shallow-copies the list. When assigning, list (re)binds the name and list[:] slice-assigns, replacing what was previously in the list. Also, don't use list as a name since it shadows the built-in. The first way works for a list or a string; the second way only works for a list, because slice assignment isn't allowed for strings. Other than that I think the only difference is speed: it looks like it's a little faster the first way.

Final Thoughts

Try it yourself with timeit.timeit () or preferably timeit.repeat (). Using Pip List Well !pip list will run inside your jupyter notebook if working there, simplifying the 'quick check' Combine with other utilities like grep (if you have installed) pip list | grep pandas will get you your current pandas version for example edited at 12:57 answered at 15:37 asliceoftom