save project

1.P.Y/1.PY

+with open(r'C:\Users\mk11\Desktop\Z.txt','r',encoding = 'utf-8') as file:
+    for date in file:
+        if '小强：10本' in date:
+            print('小强数据在文件中')
+        if '小兰：10本' in date:
+            print('小兰数据在文件中')
+        
\ No newline at end of file

diy.py

+file = open(r'C:\Users\mk11\Desktop\Z.txt','a',encoding = 'utf-8')
+file.write('小强：10本\n')
+file.write('李明：15本\n')
+file.close()
+with open(r'C:\Users\mk11\Desktop\Z.txt','a',encoding = 'utf-8') as file:
+    file.write('小强：10本\n')
+    file.write('李明：15本\n')
\ No newline at end of file