auto save

11.py

+newdata=""
 with open(r'\\Mac\Home\Desktop\book.txt','r',encoding='utf-8') as file:
 with open(r'\\Mac\Home\Desktop\book.txt','r',encoding='utf-8') as file:
     for data in file:
     for data in file:
         if '小强：10本' in data:
         if '小强：10本' in data:
-            print("小强数据在")
-        if '小兰：10本' in data:
-            print("小兰数据在")
-   
+            data=data.replace("小强：10本","小强：11本")
+        if '李白：15本' in data:
+            data=data.replace("李白：15本","李白：10本")
+        newdata+=data
+with open(r'\\Mac\Home\Desktop\book.txt','w',encoding='utf-8') as file:
+    file.write(newdata)
+with open(r'\\Mac\Home\Desktop\book.txt','r',encoding='utf-8') as file:
+    a=file.read()
+    print(a)
     
     
-# with open(r'\\Mac\Home\Desktop\book.txt','r',encoding='utf-8') as file:
-#     for data in file:
-#         if '小强：10本' in data:
-#             print('小强数据在文件中')
+# 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\CM\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:
 #         if '小兰：12本'in data:
-#             print('小兰数据在文件中')
+#             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\CM\Desktop\book.txt','w',encoding='utf-8') as file1:
+#     file1.write(new_data)
+
+# with open(r'C:\Users\CM\Desktop\book.txt','r',encoding='utf-8') as file1:
+#     a=file1.read()
+#     print(a)
\ No newline at end of file