diy.py

ndata=' '
# 写入同学们的捐赠明细：'小兰：12本、小丽：11本、李文：9本、张伟：16本'
with open(r"C:\Users\CDLX\Desktop\test.txt",'w',encoding='utf-8') as file:
    file.write('小兰：12本\n小丽：11本\n李文：9本\n张伟：16本\n小强：10本\n')

with open(r"C:\Users\CDLX\Desktop\test.txt",'r',encoding='utf-8') as file:
    for data in file:
        if '小强：10本' in data:
            data=data.replace('小强：10本\n','小强：11本\n')
        ndata=data+ndata

with open(r"C:\Users\CDLX\Desktop\test.txt",'w',encoding='utf-8') as file:
    file.write(ndata)

with open(r"C:\Users\CDLX\Desktop\test.txt",'r',encoding='utf-8') as file:
    a=file.read()
    print(a)