auto save

diy.py

+f=''
+a=open(r'C:\Users\EDZ\Desktop\test.txt','r',encoding='UTF-8')
+for i in a:
+    if '小兰：12本'in i:
+        p=i.replace('小兰：12本','小兰：19本')
+    f=f+p
+a.close()
+
+with open(r'C:\Users\EDZ\Desktop\test.txt','w',encoding='UTF-8') as a:
+    a.write(f)
\ No newline at end of file