通过Python编写一个简单登录功能过程解析

import datetime
count = 0
while count < 3:
  username = input("username: ")
pwd = input("password: ")
date = datetime.date.today()
if username.strip() == ""
or pwd.strip() == "":
  print("您输入的是空值，请重新输入")
count = count + 1
continue
elif username == "shenxianlu"
and pwd == "123456":
  print("%s,欢迎您登录，今天日期是：%s" % (username, date))
break
else :
  print("输入的账号密码有误请重试")
count = count + 1
else :
  print("您的三次机会已经用完，无法继续输入")