auto save

diy2.py

+a= "a"
+b= "123456"
+while True:
+    c = input("请输入用户名:")
+    d = input("请输入密码:")
+    if c == a and d == b:
+        print("登录成功!")
+        break 
+    if c != a :
+        print("用户名错误!请重新输入")
+        continue
+    if d != b :
+        print("密码输入错误！请重新输入")
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