save project

Untitled-1.py.py

+with open(r"C:\Users\Windows 10\Desktop\book.txt",'w',encoding='utf-8')as a:
+    a.write("小兰：12本\n小强：10本\n小明：8本\n小红：9本")
+new_a=''
+with open(r"C:\Users\Windows 10\Desktop\book.txt",'r',encoding='utf-8')as a:
+    for i in a:
+        if "小强：10本" in i:
+            i=i.replace("小强：10本","小强：11本")
+        new_a+=i
+with open(r"C:\Users\Windows 10\Desktop\book.txt",'w',encoding='utf-8')as a:
+    a.write(new_a)
\ No newline at end of file