Python之练习Demo

遍历本地文件系统 (sys, os, path)，例如写一个程序统计一个目录下所有文件大小并按各种条件排序并保存结果，代码如下:

#coding:GBKimportos;defSortList(item):returnitem[1];defReadSize(fileName):returnfloat(os.path.getsize(fileName));defWriteAll(path):

l=[]

loger= open("test.log","w");

writer= open("path.txt","w");

reader= open("path.txt","r");

size=0;forroot,dirs,filesinos.walk(path):forfilesPathinfiles:try:

fllePath=os.path.join(root,filesPath);

fileSize= float(ReadSize(fllePath)/1024);

size+=fileSize;

x=(fllePath,int(fileSize));

l.append(x);except:

loger.write("读取:"+os.path.join(root,filesPath)+"文件大小失败!\n");continue;

l= sorted(l,key=SortList,reverse=True);foriteminl:

strTmp="";iffloat(item[1]/1024) > 1024:

strTmp= item[0]+""+str(int(float(item[1]/1024/1024)))+"GB\n";elifitem[1] > 1024:

strTmp= item[0]+""+str(int(float(item[1]/1024)))+"MB\n";else:

strTmp= item[0]+""+str(item[1])+"KB\n";

writer.write(strTmp);

writer.write("共使用磁盘空间:"+str(float(size/1024))+"MB");

loger.close();

writer.close();PRint(reader.read());

reader.close();

fileName=os.getcwd();

WriteAll(fileName);

raw_input("END...");