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:])