save project

diy.py

@@ -4,7 +4,11 @@ filel.write('小兰：12本')
 filel.close()
 with open(r'C:\Users\Administrator\Desktop\test.txt',"a",encoding='utf-8') as filel:    
  filel.write("小强：10本")
+new_data="
+with open(r'C:\Users\Administrator\Desktop\test.txt',"r",encoding='utf-8') as filel:
+
 with open(r'C:\Users\Administrator\Desktop\test.txt',"r",encoding='utf-8') as filel:    
    for data in data:
-       if '小兰：12本' in data:
-           print('数据在文件中')
\ No newline at end of file
+       if '小强：12本' in data:
+           data=data.replace('小强：12本','小强：10本'）
+        new_data+=data
\ No newline at end of file