python中的列表(list)和字典(dict)数据排序 --SQLite 中文社区-- http://www.sqlite.com.cn/

# sort.py
# 这个类用来演示如何对自定义对象进行排序
class Sortobj:
a = 0
b = ''
def __init__(self, a, b):
self.a = a
self.b = b
def printab(self):
print self.a, self.b
# 演示对字符串列表进行排序
samplelist_str = ['blue','allen','sophia','keen']
print samplelist_str
samplelist_str.sort()
print samplelist_str
print '\n'
# 演示对整型数进行排序
samplelist_int = [34,23,2,2333,45]
print samplelist_int
samplelist_int.sort()
print samplelist_int
print '\n'
# 演示对字典数据进行排序
sampledict_str = {'blue':'5555@sina.com',
'allen':'222@163.com',
'sophia':'4444@gmail.com',
'ceen':'blue@263.net'}
print sampledict_str
# 按照key进行排序
print sorted(sampledict_str.items(), key=lambda d: d[0])
# 按照value进行排序
print sorted(sampledict_str.items(), key=lambda d: d[1])
# 构建用于排序的类实例
obja = Sortobj(343, 'keen')
objb = Sortobj(56, 'blue')
objc = Sortobj(2, 'aba')
objd = Sortobj(89, 'iiii')
print '\n'
samplelist_obj = [obja, objb, objc, objd]
# 实例对象排序前
for obj in samplelist_obj:
obj.printab()
print '\n'
# 按照对象的a属性进行排序
samplelist_obj.sort(lambda x,y: cmp(x.a, y.a))
for obj in samplelist_obj:
obj.printab()
print '\n'
# 按照对象的b属性进行排序
samplelist_obj.sort(lambda x,y: cmp(x.b, y.b))
for obj in samplelist_obj:
obj.printab()