save project

diy.py

+new_data = ''
 with open(r'C:\Users\Huawei\Desktop\book.txt','r',encoding='utf-8') as file:
-    for date in file:
-        if '小强：10本' in date:
-            print('文件中有此数据。')
-        if '小兰：12本' in date:
-            print('文件中有此数据。')
\ No newline at end of file
+    for data in file:
+        if '小强：10本' in data:
+            data = data.replace('10','11')
+            new_data += data
+        else:
+            new_data += data
+with open(r'C:\Users\Huawei\Desktop\book.txt','w',encoding='utf-8') as file:
+    file.write(new_data)
\ No newline at end of file