python读写文件
#--------------readwrite.py-----------------##--------------read and write file----------##write(string)f = open("readwrite.txt",'w')f.write("Welcome to this file\nThere is nothing here except\nThis stupid haiku\n")f.close()#writelines(list)f = open("readwrite.txt")#默认为读lines = f.readlines()f.close()lines[0] = "#-----writelines(list)-------#\nWelcome to this file\n"f = open("readwrite.txt",'a')#a模式在原文件上继续添加f.writelines(lines)f.close()#read(n)读取前n个字符f = open("readwrite.txt","r")print "#-------------------------read(n)----------------------------#"print f.read(4)f.close()#readline()按行读取f = open("readwrite.txt")print "#-------------------------readline()----------------------------#"for i in range(3): print str(i) + ": " + f.readline() #str(i)将object转为stringf.close()#readlines()返回列表，每项为一行import pprintf = open("readwrite.txt")l = f.readlines()#返回列表print l#输出列表print "---------------------------------------"pprint.pprint(l)#每项为一行显示，而且是文件对象自动关闭的方法，所以无f.close() ?
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另一个读写实例
#----------picknames.py----------"import os#os.getcwd()返回一个表示当前工作目录的字符串，若在D:\python目录下执行此函数则返回结果"D:\PYTHON"#os.listdir()返回一个参数所指定目录的所有文件名字符串的列表，若目录内有文件file1.rm，flie2.rm，file3.rm则返回结果['file1.rm','file2.rm','file3.rm']filenames = os.listdir(os.getcwd())for name in filenames: filenames[filenames.index(name)] = name[:-3]#将每项名字去掉后三位#open为内建函数，w表示写模式，该语句新建names.txt可以进行写操作out = open("names.txt","w")for name in filenames: out.write(name + "\n")#开始写内容out.close()#读文件f = open("names.txt","r")#读取前四个字符print f.read(4)#读取剩下的字符print f.read()?
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1 楼 wanglei2999 2012-07-13 #----------picknames.py----------"