with open("文件路径"，"模式"，"编码")  as file   ("r" 是读，"w"是写)

with open(r"D:\python-installer\python-code\pythonProject\src\关于文件操作练习/人物介绍.txt","r",encoding="utf-8") as file1:
    data=file1.read()
    print(type(data)) #检验读取到的文章数据是什么类型（字符串类型）
newData=data.replace("刘小言","刘晓言")
with open(r"D:\python-installer\python-code\pythonProject\src\关于文件操作练习/人物介绍.txt","w",) as file2:
    file2.write(newData)