save project

a.py

+a = "SB"
+b = "1234567890"
+
+while True:
+    c=input("请输入账号：")
+    d=input("请输入密码：")
+    if a==c:
+        if b==d:
+            print("登录成功")
+            break
+    if a!=c and b==d:
+        print("账号错误")
+    if a==c and b!=d:
+        print("密码错误")
+    if a!=c and b!=d:
+        print("密码错误，账号错误")
\ No newline at end of file