python 小程序 查找最大的python文件

使用os.path模块方法介绍

1. 扫描标准库目录

    I 通过glob模块遍历一个目录下面的所有文件，glob接收shell中常用文件名模式语法：“？”代表任何单个字符，*代表任意字符

 import glob
 import os
 import sys

 dirname = '/usr/lib/python3.5' if len(sys.argv) == 1 else sys.argv[1]
 allsize = []

 allpy = glob.glob(dirname + os.sep + '*.py')
 for filename in allpy:
     filesize = os.path.getsize(filename)
     allsize.append((filesize, filename))

 allsize.sort()
 print(allsize[-2:])

2. 扫描标准目录树

I 通过os.walk方法来循环遍目录树

 import os
 import pprint

 dirname = '/usr/lib/python3.5'

 allsize = []
 for (curDir, subDir, fileHere) in os.walk(dirname):
     print(curDir)
     for filename in fileHere:
         if filename.endswith('.py'):
             fullname = os.path.join(curDir,filename)
             filesize = os.path.getsize(fullname)
             allsize.append((filesize,fullname))

 allsize.sort(key= lambda x:x[0])
 pprint.pprint(allsize[-2:])

3. 扫描模块搜索路径

   通过sys.path来查找，sys.path包含了所有导入的模块

 import sys
 import os
 import pprint

 allSize = []
 visited = {}
 for srcDir in sys.path:
     for(curDir, subDir, fileHere) in os.walk(srcDir):
         curDir = os.path.normpath(curDir)
         fixCase = os.path.normcase(curDir)
         if fixCase in visited:
             continue
         else:
             visited[fixCase] = True
         for filename in fileHere:
             if filename.endswith('.py'):
                 pypath = os.path.join(curDir, filename)
                 try:
                     pysize = os.path.getsize(pypath)
                 except os.error as e:
                     print(e)
                 else:
                     pylines = len(open(pypath, 'rb').readlines())
                 allSize.append((pysize, pylines, pypath))

 allSize.sort(key=lambda x:x[0])
 pprint.pprint(allSize[-2:])