diy.py

# 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'
file1=open("C:\\Users\\Administrator\\Desktop\\book.txt",'w',encoding="utf-8")
file1.write('小兰:12\n')
file1.write('小丽：11\n')
file1.write('李文：9\n')
file1.close()
with open("C:\\Users\\Administrator\\Desktop\\book.txt",'w',encoding="utf-8")
file1=open(r"C:\\Users\\Administrator\\Desktop\\book.txt",'r',encoding="utf-8")
a=file1.read()
print(a)
for date in file1:
    if'小丽:11本'in date:
        date=date.replace('小丽：11本','小丽：10本')
    print('数据在文件中')
file1.close()