python学习：字典排序

按字典值排序

按照字典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))

In [38]: sorted_x

Out[38]: [(0, 0), (2, 1), (1, 2), (4, 3), (3, 4)]

sorted_y = sorted(x.iteritems(),

key=operator.itemgetter(1),reverse=True)

找出占用空间大的文件

os.walk

os.path.getsize

dict sort(top10)

#!/usr/bin/env python

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])

sorted_dic = sorted(dic.iteritems(), key=operator.itemgetter(1),reverse=True)

for k, v in sorted_dic[:10]:

print k, ‘---->‘,v

[[email protected] day2]# python 4_top10.py .

./2_walk.py ----> 781

./3_dup.py ----> 727

./4_top10.py ----> 484

./1_md5sum.py ----> 421

./3_yield.py ----> 127

./test/a ----> 0

./test/b ----> 0

[[email protected] day2]# python 4_top10.py /etc

/etc/selinux/targeted/policy/policy.24 ----> 8377047

/etc/selinux/targeted/modules/active/policy.kern ----> 8377047

/etc/pki/tls/certs/ca-bundle.trust.crt ----> 1066943

/etc/pki/tls/cert.pem ----> 877042

/etc/pki/tls/certs/ca-bundle.crt ----> 877042

/etc/alternatives/libnssckbi.so.x86_64 ----> 709880

/etc/services ----> 641020

/etc/pki/ca-trust/extracted/openssl/ca-bundle.trust.crt ----> 359773

/etc/selinux/targeted/modules/active/file_contexts.template ----> 296225

/etc/selinux/targeted/modules/active/file_contexts ----> 290594