# 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\Administrator\Desktop\test.txt','a',encoding='utf-8')as file1:
        file1.write('小强:12本\n')
        file1.write('李明:15本\n')
file1=open(r'C:\Users\Administrator\Desktop\test.txt','a',encoding='utf-8')
file1.write('小丽:10')
file1.close()#追加

file1=open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8')
a=file1.read()
print(a)
file1.close()'''#读取
new_data=''
with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8') as file1:
        for data in file1:
            if '小强:12本' in data:
                data=data.replace('小强:12本','小强:13本')
            new_data+=data
with open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8')
    file1.write(new_data)       
with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8')
    a=file1.read()
    print(a)