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Groups > comp.lang.python > #67037
| From | Peter Otten <__peter__@web.de> |
|---|---|
| Subject | Re: Coding a simple state machine in python |
| Date | 2014-02-25 11:04 +0100 |
| Organization | None |
| References | <65ac9612-fd48-472a-b077-c802be96ece3@googlegroups.com> <41DAA444-F51A-458D-8F79-8CD3117A4879@mac.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.7351.1393322706.18130.python-list@python.org> (permalink) |
William Ray Wing wrote: > > On Feb 24, 2014, at 8:30 PM, Ronaldo <abhishek1899@gmail.com> wrote: > >> How do I write a state machine in python? I have identified the states >> and the conditions. Is it possible to do simple a if-then-else sort of an >> algorithm? Below is some pseudo code: >> >> if state == "ABC": >> do_something() >> change state to DEF >> >> if state == "DEF" >> perform_the_next_function() >> ... >> >> I have a class to which certain values are passed from a GUI and the >> functions above have to make use of those variables. How do I go about >> doing this? I have the following algorithm: >> >> class TestClass(): >> def __init__(self, var1, var2): #var1 and var2 are received from a GUI >> self.var1 = var1 >> ... >> if state == "ABC" >> doSomething(var1, var2) >> .. >> >> Could someone point me in the right direction? Thank you! >> >> -- >> https://mail.python.org/mailman/listinfo/python-list > > And, to extend Tim's suggestion of a dictionary just a bit, note that > since Python functions are happy to pass function names as arguments, you > can use a dictionary to make a really nice compact dispatch table. That > is, function A does its thing, gets to a new state, and returns as one of > its return arguments the key into the dictionary that points to the next > function_name to be called based on that new state. > > Stackoverflow has a couple of compact examples here: > > http://stackoverflow.com/questions/715457/how-do-you-implement-a-dispatch- table-in-your-language-of-choice Why have the function return a name? Why not just another function?
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Coding a simple state machine in python Ronaldo <abhishek1899@gmail.com> - 2014-02-24 17:30 -0800
Re: Coding a simple state machine in python Tim Daneliuk <tundra@tundraware.com> - 2014-02-24 19:46 -0600
Re: Coding a simple state machine in python William Ray Wing <wrw@mac.com> - 2014-02-24 21:55 -0500
Re: Coding a simple state machine in python Tim Daneliuk <tundra@tundraware.com> - 2014-02-24 21:27 -0600
Re: Coding a simple state machine in python Tim Daneliuk <tundra@tundraware.com> - 2014-02-24 21:27 -0600
Re: Coding a simple state machine in python alex23 <wuwei23@gmail.com> - 2014-02-25 15:19 +1000
Re: Coding a simple state machine in python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-25 08:35 +0000
Re: Coding a simple state machine in python Peter Otten <__peter__@web.de> - 2014-02-25 11:01 +0100
Re: Coding a simple state machine in python alex23 <wuwei23@gmail.com> - 2014-03-03 14:49 +1000
Re: Coding a simple state machine in python Peter Otten <__peter__@web.de> - 2014-02-25 11:04 +0100
Re: Coding a simple state machine in python Marko Rauhamaa <marko@pacujo.net> - 2014-02-25 13:20 +0200
Re: Coding a simple state machine in python Roy Smith <roy@panix.com> - 2014-02-24 20:54 -0500
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