本文實(shí)例講述了Python設(shè)計(jì)模式之狀態(tài)模式原理與用法。分享給大家供大家參考，具體如下：

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狀態(tài)模式(State Pattern):當(dāng)一個(gè)對(duì)象的內(nèi)在狀態(tài)改變時(shí)允許改變其行為，這個(gè)對(duì)象看起來像是改變了其類

下面是一個(gè)狀態(tài)模式的demo：

#!/usr/bin/env python
# -*- coding:utf-8 -*-
__author__ = 'Andy'
"""
大話設(shè)計(jì)模式
設(shè)計(jì)模式——狀態(tài)模式
狀態(tài)模式(State Pattern):當(dāng)一個(gè)對(duì)象的內(nèi)在狀態(tài)改變時(shí)允許改變其行為，這個(gè)對(duì)象看起來像是改變了其類
應(yīng)用場(chǎng)景:當(dāng)控制一個(gè)對(duì)象的狀態(tài)轉(zhuǎn)換的條件表達(dá)式過于復(fù)雜時(shí),把狀態(tài)的判斷邏輯轉(zhuǎn)移到表示不同狀態(tài)的一系列類當(dāng)中,可以把復(fù)雜的判斷邏輯簡(jiǎn)化
(當(dāng)一個(gè)對(duì)象的行為取決于它的狀態(tài),并且它必須在運(yùn)行時(shí)刻根據(jù)狀態(tài)改變他的行為)
"""
class State(object):
  def __init__(self):
    pass
  def write_program(self, w):
    pass
class Work(object):
  def __init__(self):
    self.hour = 9
    self.curr = ForenoonState()
  def set_state(self, s):
    self.curr = s
  def write_program(self):
    self.curr.write_program(self)
class ForenoonState(State):
  def write_program(self, w):
    if w.hour < 12:
      print "當(dāng)前時(shí)間:%s點(diǎn),"%w.hour,"精神百倍"
    else:
      w.set_state(AfternoonState())
      w.write_program()
class AfternoonState(State):
  def write_program(self, w):
    if w.hour < 17:
      print "當(dāng)前時(shí)間:%s點(diǎn),"%w.hour,"狀態(tài)還行,繼續(xù)努力"
    else:
      w.set_state(EveningState())
      w.write_program()
class EveningState(State):
  def write_program(self, w):
    if w.hour < 21:
      print "當(dāng)前時(shí)間:%s點(diǎn),"%w.hour,"加班呢,疲勞了"
    else:
      w.set_state(SleepState())
      w.write_program()
class SleepState(State):
  def write_program(self, w):
    print "當(dāng)前時(shí)間:%s點(diǎn),"%w.hour,"不行了,睡著了"
if __name__=="__main__":
  work = Work()
  work.hour = 9
  work.write_program()
  work.hour = 15
  work.write_program()
  work.hour = 20
  work.write_program()
  work.hour = 22
  work.write_program()

文章題目：Python設(shè)計(jì)模式之狀態(tài)模式原理與用法詳解-創(chuàng)新互聯(lián)
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