学步园

文件、目录的基本操作，在python使用中非常广泛。还是边练习边深入。

目录操作相关：

'''<br /> Created on 2011-5-26<br /> @author: Administrator<br /> '''<br /> import os.path<br /> dir = "C://pyFileTest"<br /> def testDir():<br /> #获得当前目录<br /> cur = os.path.curdir<br /> print(cur)</p> <p> #获得完整路径<br /> full =os.path.abspath(os.path.curdir)<br /> print(full)<br /> print(os.getcwd())</p> <p> #获得基本路径（最末路径)<br /> print(os.path.basename(full))</p> <p> #获得目录下的文件和目录，剔除'.'和'..'<br /> a = os.listdir(dir)<br /> #切换到该目录<br /> os.chdir(dir)<br /> for f in a:<br /> #判断是否为文件或者目录<br /> if (os.path.isdir(f) == True):<br /> print("it's a dir, the name is: " ,f)<br /> else :<br /> print("it's a file, the file size is: " , os.path.getsize(f))</p> <p> #创建目录<br /> os.mkdir("newdir")</p> <p> #递归遍历整个目录<br /> #返回3元组，root顶层目录，dirs为root目录下的子目录（不含","和".."），files为root目录下的文件<br /> #列出个目录下文件的大小<br /> for root, dirs, files in os.walk(dir, True, None, False):<br /> print("the dir is: " , root)<br /> sum = 0<br /> for f in files :<br /> prefix = os.path.splitext(f)[1]<br /> print('the file type is: ' , prefix)<br /> name = os.path.splitext(f)[0]<br /> print('the file name is: ', name)<br /> sum += os.path.getsize(os.path.join(root,f))</p> <p> print(sum)</p> <p>if __name__ == '__main__':<br /> testDir()

文件操作相关：

'''<br /> Created on 2011-5-26<br /> @author: Administrator<br /> '''<br /> def TestFile():<br /> #打开文件，读取每一行<br /> #其中需要用try...finally进行读取的异常处理<br /> path = "C://pyFileTest//"<br /> file = path + "test.txt"<br /> f = open(file)<br /> try:<br /> for l in f:<br /> print(l,)<br /> finally:<br /> f.close()</p> <p> #tell()方法为文件当前的pointer指针位置<br /> #seek()方法进行文件定位<br /> #先读取一行，然后在文件定位到开始<br /> f = open(file)<br /> try:<br /> print(f.readline())<br /> print("the current file pointer is:", f.tell())<br /> f.seek(0)<br /> print(f.read(3))<br /> finally:<br /> f.close()<br /> #在文件中追加数据<br /> f = open(file, "a+")<br /> try:<br /> f.write("/n=====")<br /> finally:<br /> f.close()</p> <p> #创建文件<br /> dest = "newfile.txt"<br /> f = open(path + dest, 'w')<br /> try:<br /> f.write("this is a new file")<br /> finally:<br /> f.close()</p> <p>if __name__ == '__main__':<br /> TestFile()<br />