save project

diy.py

+ndd=''
+with open(r"C:\Users\maku\Desktop\book.txt",'r',encoding="utf-8")as fee:
+    for i in fee:
+        if '小兰：12本'in i:
+            i=i.replace('小兰：12本','小兰：20本')
+        ndd+=i
+with open(r"C:\Users\maku\Desktop\book.txt",'w',encoding="utf-8")as fee:
+    fee.write(ndd)
+with open(r"C:\Users\maku\Desktop\book.txt",'r',encoding="utf-8")as fee:
+    j=fee.read()
+    print(j)
\ No newline at end of file