auto save

q.py

+# 修改小强的数据为11本，以及小兰的数据'小兰：12本'修改为14本，最后读取修改后的数据
+new_data=''
+with open(r'C:\Users\yangymhp\Desktop\book.txt','r',encoding='utf-8') as file1:
+    for data in file1:
+        if '小强：10本'in data:
+            data=data.replace('小强：10本','小强：11本')
+        if '小兰：12本'in data:
+            data=data.replace('小兰：12本','小兰：14本')
+        new_data +=data
+
+with open(r'C:\Users\yangymhp\Desktop\book.txt','w',encoding='utf-8') as file1:
+    file1.write(new_data)
+
+with open(r'C:\Users\yangymhp\Desktop\book.txt','r',encoding='utf-8') as file1:
+    a=file1.read()
+    print(a) 
+