I was trying to figure out and demonstrate python's Member Resolution Order... In particular, pay attention to the output from __str__...
#!/usr/bin/env python
# -*- coding: utf-8 -*-
class BeastBase(dict):
def __init__(self, **characteristics):
super(BeastBase, self).__init__(**characteristics)
def __str__(self):
return "; ".join(["%s=%r"%item for item in super(BeastBase, self).iteritems()])
class Mixin(object): pass
class BitingMixin(Mixin):
def __init__(self, jaws=2, teeth_per_mouth=32, **characteristics):
self.jaws=jaws
self.teeth_per_mouth=teeth_per_mouth
super(BitingMixin, self).__init__(**characteristics)
def bite(self):
print "Bite: jaws=%s, teeth=%s"%(self.jaws, self.teeth_per_mouth*self.jaws/2)
def __str__(self):
return "Jawed: %s; %s"%(self.jaws, super(BitingMixin, self).__str__())
class JawedBeast(BeastBase, BitingMixin): pass
class ClawingMixin(Mixin):
def __init__(self, feet=4, toes_per_foot=3, **characteristics):
self.feet=feet
self.toes_per_foot=toes_per_foot
super(ClawingMixin, self).__init__(**characteristics)
def catch(self):
print "Catch: feet=%s, toes=%s"%(self.feet, self.toes_per_foot*self.feet)
def __str__(self):
return "Claws: %s; %s"%(self.toes_per_foot*self.feet, super(ClawingMixin, self).__str__())
class ClawedBeast(BeastBase, ClawingMixin): pass
class FlamingMixin(Mixin):
def __init__(self, eyes=6, flames_per_eye=1, **characteristics):
self.eyes=eyes
self.flames_per_eye=flames_per_eye
super(FlamingMixin, self).__init__(**characteristics)
def flame(self):
print "Flames:", self.eyes*self.flames_per_eye
def __str__(self):
return "Eyes: %s, Flames: %s; %s"%(self.eyes, self.eyes*self.flames_per_eye, super(FlamingMixin, self).__str__())
class FlamedBeast(FlamingMixin, BeastBase): pass
class WhifflingMixin(Mixin):
def whiffle(self): print "Whiffle...."
def __str__(self): return "Whiffling... "+super(WhifflingMixin, self).__str__()
class WhifflingBeast(WhifflingMixin, BeastBase): pass
class BurblingMixin(Mixin):
def burble(self): print "Burble...."
def __str__(self): return "Burbling... "+super(BurblingMixin, self).__str__()
class BurblingBeast(BurblingMixin, BeastBase): pass
class Jabberwocky(BitingMixin, ClawingMixin, FlamingMixin, WhifflingMixin, BurblingMixin, BeastBase):
def __init__(self, **characteristics):
super(Jabberwocky, self).__init__(**characteristics)
def __str__(self):
return "JabberWocky: "+super(Jabberwocky, self).__str__()+" ... Beware! "
if __name__ == "__main__":
# Beware the Jabberwock, my son!
jabberwocky1=Jabberwocky(personality="Friendly", consideration="Temperamental", eyes=5, flames_per_eye=3)
print jabberwocky1
# Beware the Jubjub bird, and shun
# The frumious Bandersnatch!
# The jaws that bite, the claws that catch!
jabberwocky1.bite()
jabberwocky1.catch()
# And as in uffish thought he stood,
# The Jabberwock, with eyes of flame,
jabberwocky1.flame()
# Came whiffling through the tulgey wood,
jabberwocky1.whiffle()
# And burbled as it came!
jabberwocky1.burble()
Output:
JabberWocky: Jawed: 2; Claws: 12; Eyes: 5, Flames: 15; Whiffling... Burbling... consideration='Temperamental'; personality='Friendly' ... Beware!
Bite: jaws=2, teeth=32
Catch: feet=4, toes=12
Flames: 15
Whiffle....
Burble....
