Python has supported the key= for .sort since 2.4, that is year 2004, it does the Schwartzian transform within the sorting code, in C; thus this method is useful only on Pythons 2.0-2.3. all …

I have a list of Python objects that I want to sort by a specific attribute of each object:

And the sort method has a parameter, called key, which you can pass a function. Using this parameter, your list won't be ordered by the values of the list, but by the values of your …

Aug 30, 2008 · What is the best way of creating an alphabetically sorted list in Python?

Aug 3, 2010 · The key argument to sort specifies a function of one argument that is used to extract a comparison key from each list element. So we can create a simple lambda that …

Use list.sort() when you want to mutate the list, sorted() when you want a new sorted object back. Use sorted() when you want to sort something that is an iterable, not a list yet.

Can I also get the indices of the sort, so to sort another related list of lists in the same order?

Python built-ins stick to one or the other; methods on immutable types like str do chain (they can't mutate in place, so they return a new object with the mutation applied), while most methods on …

Apr 20, 2010 · 4 Especially if the data is numeric, negation can be used to sort in descending order. This is especially useful if you need to pass a sorting key anyway. For example, if the …

@Cemre as for the second example, sort here is a method of List object of Python, which receives a lambda function as its key parameter. You may name it as tup, or t, or whatever …