save project

diy2.py

+new_data=''
 with open(r'c:\Users\bellcode\Desktop\myfile2.txt','r',encoding='utf-8') as file:
-    for i in file:
-        if '李明:12'in i:
-            print('数据在txt文件中')
\ No newline at end of file
+    for data in file:
+        if '李明:12'in data:
+            data=data.replace('李明:12','李明:28')
+        new_data=new_data+data
+with open(r'c:\Users\bellcode\Desktop\myfile2.txt','w',encoding='utf-8') as file:
+    file=file.write(new_data)
+
+with open(r'c:\Users\bellcode\Desktop\myfile2.txt','r',encoding='utf-8') as file:
+    a=file.read()
+    print(a)
\ No newline at end of file