save project

diy.py

-with open(r'C:\book.txt','w',encoding='utf-8') as file:
+new_data=''
+with open(r'C:\book.txt','r',encoding='utf-8') as file1:
     for data in file1:
     for data in file1:
-        if '小强:10本'in data
-            print('小强数据在文件中')
-        if '小兰:12本'in data
-            print('小兰数据在文件中')
-
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-
+        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 +=new_data
+
+with open(r'C:\book.txt','r',encoding='utf-8') as file1:
+    file1.write(new_data)
+
+with open(r'C:\book.txt','r',encoding='utf-8') as file1:
+    a=file1.read()
+    print(a)