auto save

diy.py

+# ay=open(r'C:\Users\Administrator\Desktop\book.txt','w',encoding='uft-8')
+# ay.write('小兰：12本')
+#ay.write('小丽：12本')
+#ay.write('李文：9本')
+#ay.write('张伟：16本')
+#ay.close()
+
+
+with open(r'C:\Users\Administrator\Desktop\book.txt','r',encoding='uft-8')as file1:
+    for data in file1:
+        if data in file1:
+            if'小强：10本'in data:
+                print('数据在文件中')
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