Python sort, sorted

1.

(1) the. Sorted () method returns a new list (the default ascending order).

List.sort ()

(2). Another difference: the List.sort () method is defined only in the list, and the sorted () method is valid for all iteration sequences.

2.key Parameters/Functions

Starting with python2.4, the key parameter is added in List.sort () and sorted (), and the key is called at a lighter of each element.

For example, use the function specified by key to ignore the case of the string:

The sequence of complex objects is sorted by certain values of complex objects:

To sort complex objects that have named properties:

3.Operator module functions

The operator module has itemgetter, Attrgetter, which increases the Methodcaller method starting from 2.6.

operator allow multilevel sorting: first with grade, then by age

4. Ascending and Descending

Both List.sort () and sorted () accept a parameter of reverse (True or False) to indicate ascending or descending order.

5. Stability and complexity of sequencing

When multiple elements have the same key, their order of precedence is unchanged before and after sorting.

Note: The order of the "blue" after sorting is maintained, i.e. (' Blue ', 1) in front of (' Blue ', 2).

Build multiple steps for a more complex sort: Student data is sorted first in descending order of grade and then in ascending order of age

Python sort, sorted