Coding a simple state machine in python
Peter Otten
__peter__ at web.de
Tue Feb 25 05:04:26 EST 2014
William Ray Wing wrote:
>
> On Feb 24, 2014, at 8:30 PM, Ronaldo <abhishek1899 at 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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