# 1. 简单直接粗暴的方式 # f = open("stus.txt",encoding="utf-8") # content = f.read() # content = content.upper() #把字母都变成大写 # f.close() # # f = open("stus.txt",'w',encoding="utf-8") #w模式打开，文件被清空 # f.write(content) # f.close() # # f = open("stus.txt","a+",encoding="utf-8") # f.seek(0) # content = f.read() # f.seek(0) # f.truncate() #删除文件的内容，从指针的位置开始删除 # # print(content.split()) # for stu in content.split(): # stu = stu.capitalize() #把首字母大写 # # f.write(stu) # f.write(stu+"\n") # 2.一行一行处理 import os f = open("stus.txt",encoding="utf-8") f2 = open("stus_new.txt","w",encoding="utf-8") for line in f: line = line.capitalize() f2.write(line) f.close() f2.close() os.remove("stus.txt") #删除原文件 os.rename("stus_new.txt","stus.txt") #把新文件改名成原文件