save project

diy2.py

+a = "ba ba"
+b = "1234"
+while True:
+    A = input("请输入用户名:")
+    B = input("请输入密码:")
+    if A == a and B == b:
+        print("登录成功!")
+        break
+    elif a!=A:
+        print("用户名错误!")
+    else :
+        print("密码错误!")
+    print("用户名和密码错误!请重新输入")
+print("欢迎来到贝尔编程!")
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