1. 判断输入的字符是否一致
SIZE="hello"
char=input("输入字符名称:")
if char == SIZE:
print("字符名称%s"%char,"等于",SIZE)
else:
print("请输入字符",SIZE)
2.判断登录验证用户名密码
user="desperado"
pwd="123456"
username=input("用户名：")
password=input("密码：")
if username == user and password == pwd:
print("login successful ...")
elif username != user:
print("the user does not exist")
else:
print("login fail")
原文：http://www.cnblogs.com/shansongxian/p/6029816.html