Python\u72b6\u6001\u6a21\u5f0f<\/h1>\n

Python\u72b6\u6001\u6a21\u5f0f\u8be6\u7ec6\u64cd\u4f5c\u6559\u7a0b<\/span>\n <\/div>\n

\n \u5b83\u4e3a\u72b6\u6001\u673a\u63d0\u4f9b\u4e86\u4e00\u4e2a\u6a21\u5757\uff0c\u8be5\u6a21\u5757\u4f7f\u7528\u4ece\u6307\u5b9a\u72b6\u6001\u673a\u7c7b\u6d3e\u751f\u7684\u5b50\u7c7b\u5b9e\u73b0\u3002\u8fd9\u4e9b\u65b9\u6cd5\u4e0e\u72b6\u6001\u65e0\u5173\uff0c\u5e76\u5bfc\u81f4\u4f7f\u7528\u88c5\u9970\u5668\u58f0\u660e\u8f6c\u6362\u3002\n <\/div>\n

\u5982\u4f55\u5b9e\u73b0\u72b6\u6001\u6a21\u5f0f\uff1f<\/h2>\n

\n \u72b6\u6001\u6a21\u5f0f\u7684\u57fa\u672c\u5b9e\u73b0\u5982\u4e0b\u6240\u793a-\n <\/div>\n

 # Filename : example.py<\/span>
# Copyright : 2020 By Bianchenghao6<\/span>
# Author by : bianchenghao6.com<\/span>
# Date : 2020-08-22<\/span>
class <\/span>ComputerState(object):
     name = \"state\"<\/span>
     allowed = []
     def <\/span>switch(self, state):
         \"\"<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\" Switch to new state \"<\/span>\"\"
         if <\/span>state.name in <\/span>self.allowed:
             print('Current:'<\/span><\/span>,self,' => switched to new state'<\/span>,state.name)
             self.__class__ = state
         else:<\/span>
             print('Current:',self,' => switching to'<\/span>,state.name,'not possible.'<\/span>)
     def <\/span>__str__(self):
         return <\/span>self.name
 class <\/span>Off(ComputerState):
     name = \"off\"<\/span>
     allowed = ['on'<\/span><\/span><\/span>]
 class <\/span>On(ComputerState):
     \"\"\" State of being powered on and <\/span>working \"<\/span>\"\"
     name = \"on\"<\/span>
     allowed = ['off'<\/span>,'suspend'<\/span>,'hibernate'<\/span>]
 class <\/span>Suspend(ComputerState):
     \"\"\" State of being in <\/span>suspended mode after switched on \"<\/span>\"\"
     name = \"suspend\"<\/span>
     allowed = ['on']
 class <\/span>Hibernate(ComputerState):
     \"\"\" State of being in <\/span>hibernation after powered on \"<\/span>\"\"
     name = \"hibernate\"<\/span>
     allowed = ['on']
 class <\/span>Computer(object):
     \"\"\" A class <\/span>representing a computer \"<\/span>\"\"
     def <\/span>__init__(self, model='HP'<\/span>):
         self.model <\/span>= model
         # State of the computer - default is <\/span>off.
<\/span>         self.state = Off<\/span>()
     def <\/span>change(self, state):
         \"\"\" Change state \"<\/span>\"\"
         self.state.switch<\/span>(state)
 if <\/span>__name__ == \"__main__\"<\/span>:
     comp = Computer()
     comp.change<\/span>(On)
     comp.change<\/span>(Off)
     comp.change<\/span>(On)
     comp.change<\/span>(Suspend)
     comp.change<\/span>(Hibernate)
     comp.change<\/span>(On)
     comp.change<\/span>(Off)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\u8f93\u51fa<\/h3>\n\n    \u4e0a\u9762\u7684\u7a0b\u5e8f\u751f\u6210\u4ee5\u4e0b\u8f93\u51fa-\n  <\/div>\n\nCurrent: off => switched to new state on \n
 Current: on => switched to new state off \n
 Current: off => switched to new state on \n
 Current: on => switched to new state suspend \n
 Current: suspend => switching to hibernate not possible. \n
 Current: suspend => switched to new state on \n
 Current: on => switched to new state off<\/code><\/pre>\n<\/p><\/div>\n <\/body>
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