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 of which are more …

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

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 returns the last …

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 function on the list. In …

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 …

Please use Why do these list operations (methods) return None, rather than the resulting list? to close questions where OP has inadvertently assigned the result of .sort(), rather than using sorted or a …

I have a list of lists. For example, [ [0,1,'f'], [4,2,'t'], [9,4,'afsd'] ] If I wanted to sort the outer list by the string field of the inner lists, how would you do that in python?

@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 you like and it'll still …

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 data was as follows: