4.py

# 修改小强的数据为11本，以及小兰的数据'小兰：12本'修改为14本，最后读取修改后的数据
new_data=''
with open(r'C:\Users\qihang\Desktop\test.text','r',encoding='utf-8') as file1:
    for data in file1:
        if '小aaa：11本'in data:
            data=data.replace('小aaa：11本','小强：11本')
        if '小兰：12本'in data:
            data=data.replace('小兰：12本','小兰：14本')
        new_data +=data

with open(r'C:\Users\qihang\Desktop\test.text','w',encoding='utf-8') as file1:
    file1.write(new_data)

with open(r'C:\Users\qihang\Desktop\test.text','r',encoding='utf-8') as file1:
    a=file1.read()
    print(a)