auto save

diy.py

+with open(r"C:\Users\admin\Desktop\111222.txt",'w',encoding='utf-8') as nb:
+    nb.write('sb')
+xin_nb=''
+with open(r"C:\Users\admin\Desktop\111222.txt",'r',encoding='utf-8') as nb:
+    for i in nb:
+        if 'sb' in nb:
+            nb=nb.replace('sb','fw')
+        xin_nb += nb
+with open(r"C:\Users\admin\Desktop\111222.txt",'w',encoding='utf-8') as nb:
+    nb.write(xin_nb)
\ No newline at end of file