save project

diy2.py

-# N="a"
-# P = "q"
-# while True:
-#     n=input("请输入用户名:")
-#     p=input("请输入密码:")
-#     if n!=N:
-#         print("用户不存在")
-#     if p!=P:
-#         print("密码错误")
-#     if n==N and p==P:    
-#         print("登录成功!")
-#         break
-# print("欢迎来到贝尔编程!")
-# cl=["red","violet","yellow","orange"]
-# import turtle
-# s=turtle.Screen()
-# pen=turtle.Pen()
-# for i in range (1,300):
-#     pen.forward(i)
-#     pen.pencolor(cl[i%4])
-#     pen.right(91)
-# s.bgcolor(black)
-# pen.hideturtle()
+N="a"
+P = "q"
+while True:
+    n=input("请输入用户名:")
     
-# turtle.done()
     
-# for i in range(1,10):
-#     for j in range(1,i+1):
-#         print(j,'X',i,'=',(i*j),end=(" "))
-#     print()
-br1="关"
-br2="刘"
-br3="张"
-brs=["刘","关","张"]
-br1=["关",160,8.5]
-br2=["刘",161,9.1]
-br3=["张",163,8.3]
-brs[0]="关"
-brs[1]="刘"
+    if n!=N:
+        print("用户不存在")
+        continue
+    p=input("请输入密码:")
+    if p!=P:
+        print("密码错误")
+    if n==N and p==P:    
+        print("登录成功!")
+        break
+print("欢迎来到贝尔编程!")
+