auto save

diy.py

 # 写入同学们的捐赠明细：'小兰：12本'、'小丽：11本'、'李文：9本'、'张伟：16本'
-file1 = open(r"D:\test1.txt",'a',encoding="utf-8")
-file1.write("\n")
-file1.write("刘能 51岁")
-file1.close()
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+# file1 = open(r"D:\test1.txt",'a',encoding="utf-8")
+# file1.write("\n")
+# file1.write("小兰：12\n")
+# file1.write("小丽：11本\n")
+# file1.close()
+
+with open(r"D:\test1.txt",'r',encoding="utf-8") as file1:
+    for i in file1:
+        if "小黑：12" in i: 
+            print("有数据")
+        else:
+            print("压根没有这个人")
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