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'
+#with open(r"C:\Users\Administrator\Desktop\book.txt",'a',encoding='utf-8')as file: 
+    #file.write('小兰:12本\n')
+    #file.write('小丽:11本\n')
+    #file.write('李文:9本\n')
+    #file.write('张伟:16本\n')
+    #file.write('小强:12本\n')
+    #file.write('李明:15本\n')
+new=''
+with open(r"C:\Users\Administrator\Desktop\book.txt",'r',encoding='utf-8')as file: 
+    for sb in file:
+        if '小强:12本' in sb:
+            sb=sb.replace('小强:12本','小强:11本')
+        if '小兰:12本' in sb:
+            sb=sb.replace('小兰:12本','小兰:14本')
+        new=new+sb
+
+with open(r"C:\Users\Administrator\Desktop\book.txt",'w',encoding='utf-8')as file:
+    file.write(new)
\ No newline at end of file