save project

diy2.py

+i=4
+username = "python"
+userpassword = "1"
+while i>0:
+    print(i) 
+    i-=1
+    if i==0:
+        print("sb")
+        exit()
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
+    if name == username and password == userpassword:
+        print("登录成功!")
+        break
+    if name!=username:
+        print("用户名错误!请重新输入")    
+        print("sb还有"+str(i)+"次")
+        continue
+    if password!=userpassword:
+        print("用密码错误!请重新输入")
+print("欢迎来到贝尔编程!")
\ No newline at end of file