save project

diy.py

@@ -10,7 +10,15 @@
 #     file1.write('小强:12本\n')
 #     file1.write('李明:15本\n')
 
+new_data = ''
 with open(r'C:\Users\EDZ\Desktop\test.txt','r',encoding = 'utf-8') as file1:
     for data in file1:
-        if '小强:12本\n' in data:
-            print('数据在文件中')
\ No newline at end of file
+        print(data)
+        if '小强:12本' in data:
+            print('数据在文件中')
+            data = data.replace('12','11')
+            print(data)
+        new_data += data
+
+with open(r'C:\Users\EDZ\Desktop\test.txt','w',encoding = 'utf-8') as file1:
+    file1.write(new_data)
\ No newline at end of file