Mar 5, 2009 · I have a dictionary of values read from two fields in a database: a string field and a numeric field. The string field is unique, so that is the key of the dictionary. I can sort on the keys, but ...

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 …

Aug 30, 2008 · 8 But how does this handle language specific sorting rules? Does it take locale into account? No, list.sort() is a generic sorting function. If you want to sort according to the Unicode …

I have the following list created from a sorted csv list1 = sorted(csv1, key=operator.itemgetter(1)) I would actually like to sort the list by two criteria: first by the value in field 1 and then ...

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

Sep 22, 2010 · 15 You're trying to use key functions with lambda functions. Python and other languages like C# or F# use lambda functions. Also, when it comes to key functions and according to the …

Jan 26, 2017 · There are a number of Python modules that provide dictionary implementations which automatically maintain the keys in sorted order. Consider the sortedcontainers module which is pure …

The function you pass in to key is given each of the items that are being sorted, and returns a "key" that Python can sort by. So, if you want to sort a list of strings by the reverse of the string, you could do this:

One simple way to see it is that the sorted() (or list.sort()) function in Python operates on a single key at a time. It builds a key list in a single pass through the list elements.

2 Sort using a key Since pandas 1.1.0, we can pass a key= parameter which admits a function as a sorting key much like the key argument in the builtin sorted() function in Python. However, unlike the …