按照字典排序,
按照字典的value排序，类似sort -k命令
import operator
x = {1:2,3:4, 4:3, 2:1, 0:0}
sorted x =sorted(x.iteritems(),
key = operator.itemgetter(1))
0表示根据key排序，1表示根据value排序
In [33]: sorted(x.iteritems(),key=operator.itemgetter(0)) Out[33]: [(0, 0), (1, 2), (3, 4), (4, 3), ('1', 2)] In [34]: sorted(x.iteritems(),key=operator.itemgetter(1)) Out[34]: [(0, 0), (1, 2), ('1', 2), (4, 3), (3, 4)] reverse默认为false，everse=True表示倒序排列
sorted_y = sorted(x.iteritems(),
key=operator.itemgetter(1),reverse=True)
In [35]: sorted(x.iteritems(),key=operator.itemgetter(1),reverse=True) Out[35]: [(3, 4), (4, 3), (1, 2), ('1', 2), (0, 0)] 例子：找出占用空间大的文件
os.walk ＃对目录遍历
os.path.getsize ＃获取文件的大小
dict sort(top10)
#!/usr/bin/env python #ecoding=utf8 import os import sys import operator def gen_dic(topdir): dic = {} a = os.walk(topdir) for p, d, f in a: for i in f: fn = os.path.join(p,i) f_size = os.path.getsize(fn) dic[fn] = f_size return dic if __name__ == '__main__': dic = gen_dic(sys.argv[1]) #生成一个字典，显示argv［1］目录的文件和文件大小 sorted_dic = sorted(dic.iteritems(),key=operator.itemgetter(1),reverse = True) print sorted_dic [root@133 systeminformation]# pwd /opt/python/systeminformation [root@133 systeminformation]# ll 总用量 32 -rw-r--r-- 1 root root 427 12月 2 14:58 1_md5.py -rw-r--r-- 1 root root 453 12月 2 16:48 1_walk.py -rw-r--r-- 1 root root 425 10月 24 05:57 hashlib2.py drwxr-xr-x 2 root root 4096 10月 24 06:03 test -rw-r--r-- 1 root root 527 12月 6 16:00 top10.py -rw-r--r-- 1 root root 430 10月 25 21:56 walk1.py -rw-r--r-- 1 root root 128 10月 25 18:07 yield1.py -rw-r--r-- 1 root root 680 10月 25 21:27 yield2.py [root@133 systeminformation]# python top10.py . #打印当前目录下文件，根据大小排序 [('./yield2.py', 680), ('./top10.py', 527), ('./1_walk.py', 453), ('./walk1.py', 430), ('./1_md5.py', 427), ('./hashlib2.py', 425), ('./yield1.py', 128), ('./test/b', 0), ('./test/a', 0)] [root@133 systeminformation]# vim top10.py #!/usr/bin/env python #ecoding=utf8 import os import sys import operator def gen_dic(topdir): dic = {} a = os.walk(topdir) for p, d, f in a: for i in f: fn = os.path.join(p,i) f_size = os.path.getsize(fn) dic[fn] = f_size return dic if __name__ == '__main__': dic = gen_dic(sys.argv[1]) #生成一个字典，显示argv［1］目录的文件和文件大小 sorted_dic = sorted(dic.iteritems(),key=operator.itemgetter(1),reverse = True) for k,v in sorted_dic[:10]: ＃只显示0-9的大小占前10的文件 print k,v [root@133 systeminformation]# python top10.py ../yield2.py 680./top10.py 556./1_walk.py 453./walk1.py 430./1_md5.py 427./hashlib2.py 425./yield1.py 128./test/b 0./test/a 0