auto save

diy.py

+ij=open(r'C:\Users\29018\Desktop\uxcucya.txt','w',encoding='utf-8')
+ij.write('小兰：12本,小丽：11本,李文：9本,张伟：16本')
+ij.close()
+
+new_data=''
+ij=open(r'C:\Users\29018\Desktop\uxcucya.txt','r',encoding='utf-8')
+for i in ij:
+    if '小兰' in i:
+        data=i.replace('小兰','小灰')
+        new_data=new_data+data
+    else:
+        print('不在')
+        
+ij=open(r'C:\Users\29018\Desktop\uxcucya.txt','w',encoding='utf-8')
+ij.write(new_data)
+ij.close()