save project

12345.py

+new_data=''
 with open(r'C:\Users\lhy\Desktop\新建文件夹\book.txt','r',encoding='utf-8') as file:
 with open(r'C:\Users\lhy\Desktop\新建文件夹\book.txt','r',encoding='utf-8') as file:
     for dada in file:
     for dada in file:
         if'小明：10本'in dada:
         if'小明：10本'in dada:
-            print('数据在文件中')
+            data=data.replace('小强：10本','小强：11本')
         if'小兰：10本'in dada:
         if'小兰：10本'in dada:
-            print('数据在文件中')
+            data=data.replace('小兰：12本','小兰：14本')
\ No newline at end of file
+        new_data +=data
+
+
+with open(r'C:\Users\lhy\Desktop\新建文件夹\book.txt','w',encoding='utf-8') as file:
+    file1.write(new_data)
+
+
+with open(r'C:\Users\lhy\Desktop\新建文件夹\book.txt','r',encoding='utf-8') as file:
+    a=file1.read()
+    print(a)
\ No newline at end of file