Original version by Andrew Dalke with a major update by Raymond Hettinger
原始版本是Andrew Dalke，然后更新的是Raymond Hettinger
There are many ways to use them to sort data and there doesn't appear to be a single, central place in the various manuals
describing them, so I'll do so here.
有许多方法对数据排序，但在各种手册中没有一个单一的，集中的地方描述。所以我将来做这件事。
Sorting Basics
基本排序
A simple ascending sort is very easy -- just call the sorted() function. It returns a new sorted list:
一个简单的升序排序很简单 -- 调用 sorted() 函数。它返回一个排好序的列表
You can also use the list.sort() method of a list. It modifies the list in-place (and returns None to avoid confusion).
Usually it's less convenient than sorted() - but if you don't need the original list, it's slightly more efficient.
你也可以就地使用list自带的list.sort()（返回None为了避免混乱），通常它没有sorted()方便。--但是如果你不需要原始的list.他稍微更加高效
a = [5, 2, 3, 1, 4]
a_asc = sorted(a)
print a_asc
a_desc = sorted(a, reverse=True)
print a_desc
运行结果：
C:\Python27\python.exe F:/python/pysort.py
[1, 2, 3, 4, 5]
[5, 4, 3, 2, 1]
a = [5, 2, 3, 1, 4]
a.sort()
print a
a = [5, 2, 3, 1, 4]
q = a.sort(reverse=True)
print a
print q
运行结果：
C:\Python27\python.exe F:/python/pysort.py
[1, 2, 3, 4, 5]
[5, 4, 3, 2, 1]
None
Another difference is that the list.sort() method is only defined for lists. In contrast, the sorted() function accepts any iterable.
有一点不同，list.sort()适用于lists，于此相反，而sorted（）适用于所有iterable
__author__ = 'dell'
from operator import itemgetter, attrgetter
b = sorted({1: 'D', 2: 'B', 3: 'B', 4: 'E', 5: 'A'})
print b
sen = 'this is a test string from andrew'.split()
res = sorted(sen, key=str.lower)
print res
class Student:
def __init__(self, name, grade, age):
self.name = name
self.grade = grade
self.age = age
def __repr__(self):
return repr((self.name, self.grade, self.age))
student_objects = [Student('john', 'A', 15), Student('jane', 'B', 12), Student('dave', 'B', 10)]
res_std = sorted(student_objects, key= lambda student: student.age)
print res_std
res_std = sorted(student_objects, key=attrgetter('age'))
print res_std
res_std = sorted(student_objects, key=attrgetter('grade', 'age'))
print res_std
print '---------------------------------------------------------------'
student_tuples = [('john', 'A', 15), ('jane', 'B', 12), ('dave', 'B', 10)]
stus = sorted(student_tuples, key= lambda student: student[2])
print stus
stus = sorted(student_tuples, key=itemgetter(2))
print stus
stus = sorted(student_tuples, key=itemgetter(1, 2))
print stus
