4. File modification

General methods for modifying the contents of documents ：

Rewrite the data into a new file , Then delete the old file , Then change the copy to the main version

The following is a general's surname “ Zhou ” Replace with last name ：“ Yang ” The operation of

The code is as follows ：

import os

with open(' name .txt',mode='r',encoding='utf-8') as f1,\
    open(' name - copy .txt',mode='w',encoding='utf-8') as f2:
    for i in f1:
        if i.startswith(' Zhou '):
            i = i.replace(' Zhou ',' Yang ')
        f2.write(i)

os.remove(' name .txt') #  Delete the original document 
os.rename(' name - copy .txt',' name .txt')  #  Rename the copy file