save project

diy.py

@@ -7,3 +7,13 @@ with open(r"C:\Users\lenovo\Desktop\book.txt",'r') as filtel:
     for data in filtel:
         if '222' in data:
             print('数据在文件')
+
+new_data=""
+with open(r"C:\Users\lenovo\Desktop\book.txt",'r')as filtel:
+    for data in filtel:
+        if '111' in data:
+            data=data.replace("111","444")
+        new_data +=data
+
+with open(r"C:\Users\lenovo\Desktop\book.txt",'w')as filtel:
+       filtel.write(new_data)