save project

diy2.py

+a=0
+u = "python"
+us = "123456"
+while True:
+    if a<0
+        n = input("请输入用户名:")
+        p = input("请输入密码:")
+        if n == u and p == us:
+            print("登录成功!")
+            break
+        if u !=n:
+            print("用户名错误!请重新输入")
+            a=a-1
+            continue
+        if us!= p:
+            print("密码错误!请重新输入") 
+        if a==0:
+            exit
+print("欢迎来到贝尔编程!")
\ No newline at end of file