auto save

diy2.py

+a="python"
+b="12345"
+while True:
+    c=input("输入用户名：")
+    d=input("输入密码：")
+    if a==c and b==d:
+        print("输入成功！")
+        break
+    if c!=a:
+        print("用户名错误，请重新输入！")
+    if d!=b:
+        print("密码输入错误，请重新输入！")
+print("欢迎来到贝尔编程！")
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