Python Strategy Pattern: using class wrapper not function + simple_vs_easy_logic

Question

I am trying to build a Strategy Pattern using S.Lott's response.
Problem is function returns None.
Am using Hickey's Simple vs Easy {what, how, who}-logic.
-[WHAT] I/O

class base_fnc(object): def fncExc(self,data1,data2): return

-[HOW] DATA <> queue[where,when] (direct injection)

class stump( base_fnc ): def fncExc(self, d1, aContext): return d1 class MAB(base_fnc ): def fncExc(self, d, aContext ): return d+10

-[WHO] API

class context( object ): def __init__(self, alt_how_class ): self.how = alt_how_class def exc(self, d ): return self.how.fncExc(d, self) if __name__ == "__main__": c1 = context(MAB()) ss=c1.exc(10) print ss

ss prints None

Downvoting because this is unlikely to be useful for others. No offense. — Sven Marnach
– Sven Marnach, Commented Jun 25, 2013 at 21:38

BrenBarn · Accepted Answer · 2013-06-25 21:34:50Z

2

You're not returning in exc. You need to do return self.how.fncExc(d, self).

answered Jun 25, 2013 at 21:34

BrenBarn

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