save project

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'
 # 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'
-# a=open(r"C:\Users\Administrator\Desktop\test.txt",'a',encoding='utf-8')
-# a.write('小兰:12本') 
-# a.write('李明:10本\n')
-# a.write('小强:15本\n')
-# a.close()
-with open(r"C:\Users\Administrator\Desktop\test.txt",'w',encoding='utf-8') as a:
-    a.write('小丽:11本\n')
-    a.write('里文:9本\n')
-    a.write('张伟:16本\n')
+u=''
+with open(r"C:\Users\Administrator\Desktop\test.txt",'r',encoding='utf-8') as file:
+    for i in file:
+        if '小兰:12本' in i:
+            i=i.replace('小兰:12本','小兰:13本')
+        u=u+i
+with open(r"C:\Users\Administrator\Desktop\test.txt",'w',encoding='utf-8') as file:
+    file.write(u)
\ No newline at end of file