save project

12-3.py

+new_data=''
 with open(r'C:\Users\WIN10\Documents\新建文本文档.txt','r',encoding='utf-8')as file:
     for data in file:
         if '1' in data:
             print('1在文件中')
-        if '20' in data:
-            print('20在文件中')
\ No newline at end of file
+            a=data.replace('0','10')
+        new_data += a
+        print(new_data)
+with open(r'C:\Users\WIN10\Documents\新建文本文档.txt','w',encoding='utf-8')as file1:
+    file1.write(new_data)         
\ No newline at end of file