python文件操作
#coding=utf-8 import sys import time f = open("demo.txt") #打开文件,python3中可以加参数encoding = "utf-8" #print (f.read())#文件光标会跳到最后 #f.write("我今天学习了吗") #w表示写,r表示读,a表示追加,r+ 读写,w+写读,a+追加读,rb二进制文件读(网络传输) #wb二进制写 """ for i in range(5): print (f.readline()) for index,line in enumerate(f.readlines()):#下标和列表项,只适合读小文件 print index,line """ #另一种文件迭代器 num = 0 for line in f: if num == 9: continue print line num +=1 print (f.tell()) #打印当前的指针位置 print (f.seek(0)) #移动光标 print (f.tell()) print (f.name) print (f.flush()) #把书写的内容刷到硬盘上,适合实时写入文件 for i in range(50): time.sleep(0.1) sys.stdout.write("#") #CMD界面简易的进度表 sys.stdout.flush() f.truncate(10)#从当前光标往后截断留下前面的 f.close() #文件的修改 #coding=utf-8 f = open("demo.txt","r") with open("demo.txt","r") as f: print f.read() with open(file1) as obj1, open(file2) as obj2: """ f_new= open("demonew.txt","w") for line in f: if "你的光照" in line: line = line.replace("你的光照","abc") f_new.write(line) f_new.close() print open("demonew.txt","r").read() """