python 类实例化，修改属性值

class User(object):
   def __init__(self, first_name, last_name, login_attempts):
      self.first_name = first_name
      self.last_name = last_name
      self.login_attempts = login_attempts

   def increment_login_attempts(self, miles):
      '''递增'''
      self.login_attempts += miles

   def reset_login_attempts(self):
      '''重置'''
      self.login_attempts = 0

   def read_login_attempts(self):
      '''打印'''
      print self.first_name + ' ' + self.last_name + ' ' + 'this is ' + str(self.login_attempts)

user = User('xiao', 'ming', 5)
user.increment_login_attempts(10)
user.read_login_attempts()

user.increment_login_attempts(10)
user.read_login_attempts()

user.increment_login_attempts(10)
user.read_login_attempts()

user.reset_login_attempts()
user.read_login_attempts()