[Tutor] Levels of Politeness, or Granularity and Placement of Methods?
Israel Evans
israel@lith.com
Thu, 6 Jun 2002 15:49:27 -0700
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I have a question for the Tutor Community that pertains to OOP and, um other
stuff like that. :-)
Let's say that I have a couple of types of objects: A Player and a Card.
#####
#The Player would have look a little like this...(no methods or functions
yet)
class Player:
def __init__(self, name):
self.name = name
self.coolness = 0
self.pythonicallity = 0
self.hand = []
self.applied_cards = []
#The Card would have look a little like this...(no methods or functions yet)
class Card:
def __init__(self, name, suit, effects):
self.name = name
self.suit = suit
self.effects = effects
#Here I'll set up a couple of Cards
cool_card = Card('coolio', 'ice', {'coolness': 10}
snake_card = Card('Pythorlo the Pseudo Coder', 'slitherin',
{'pythonicallity':10}
And gather them into a list called deck.
#
deck = [cool_card, snake_card]
Now I've got a couple of functions for applying the effects of the card to
the Player's attributes, but I'm wondering how "polite" I should make them.
As it stands, the functions I have, take a look at the cards' innards and
applies the effects to the Players attributes. For instance the applyCard
function...
# inside Player
def applyCard(self, deck, card):
self.applied_cards.append(deck.pop(card))
for effect in card.effects:
self.__dict__[effect] = card[effect]
Instead of grubbing around inside of the card should the Player politely ask
the Card for the effect data and wait for an answer, then apply what given
to it to it's attributes?
Maybe something like the following...
# inside Card
def reportEffects(self):
return self.effects
# inside Player
def applyCard(self, deck, card)
self.applied_cards.append(deck.pop(card))
effects = card.reportEffects()
for effect in effects:
self.__dict__[effect] = effects[effect]
I guess what I'm asking is : Should "Communicate" with each other like
equals, or should they "Use" each other. It seems that the more polite an
object is the easier it will be for the objects it deals with to change how
they work internally, but still retain functionality later on.
What would your suggestions be on this subject?
Thanks,
~Israel~
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<body lang=3DEN-US link=3Dblue vlink=3Dpurple =
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<div class=3DSection1>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I have a question for the Tutor Community that =
pertains to
OOP and, um other stuff like that.<span =
style=3D'mso-spacerun:yes'> </span></span></font><font
size=3D2 face=3DWingdings><span =
style=3D'font-size:10.0pt;font-family:Wingdings;
mso-ascii-font-family:Arial;mso-hansi-font-family:Arial;mso-bidi-font-fa=
mily:
Arial;mso-char-type:symbol;mso-symbol-font-family:Wingdings'><span
style=3D'mso-char-type:symbol;mso-symbol-font-family:Wingdings'>J</span>=
</span></font><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Let's say that I have a couple of types of =
objects:<span
style=3D'mso-spacerun:yes'> </span>A Player and a =
Card.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#####<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#The Player would have look a little like this<span
class=3DGramE>...(</span>no methods or functions =
yet)<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><span class=3DGramE><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>class</span></font></span><=
font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> =
Player:<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:1'> &nbs=
p; </span><span
class=3DGramE>def</span> __init__(self, =
name):<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><span
class=3DSpellE>self.name</span> =3D name<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><span
class=3DSpellE>self.coolness</span> =3D 0<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><span
class=3DSpellE>self.pythonicallity</span> =3D =
0<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><span
class=3DSpellE>self.hand</span> =3D []<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><span
class=3DSpellE>self.applied_cards</span> =3D =
[]<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#The Card would have look a little like this<span
class=3DGramE>...(</span>no methods or functions =
yet)<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><span class=3DGramE><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>class</span></font></span><=
font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> =
Card:<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:1'> &nbs=
p; </span><span
class=3DGramE>def</span> __init__(self, name, suit, =
effects):<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><span
class=3DSpellE>self.name</span> =3D name<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><span
class=3DSpellE>self.suit</span> =3D suit<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><span
class=3DSpellE>self.effects</span> =3D =
effects<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#<span class=3DGramE>Here</span> I'll set up a =
couple of
Cards<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><span class=3DSpellE><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>cool_card</span></font></sp=
an><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> =3D <span
class=3DGramE>Card(</span>'<span class=3DSpellE>coolio</span>', 'ice',
{'coolness': 10}<o:p></o:p></span></font></p>
<p class=3DMsoNormal><span class=3DSpellE><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>snake_card</span></font></s=
pan><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> =3D <span
class=3DGramE>Card(</span>'<span class=3DSpellE>Pythorlo</span> the =
Pseudo
Coder', '<span class=3DSpellE>slitherin</span>', =
{'pythonicallity':10}<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>And gather them into a list called =
deck.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#<o:p></o:p></span></font></p>
<p class=3DMsoNormal><span class=3DGramE><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>deck</span></font></span><f=
ont
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> =3D [<span
class=3DSpellE>cool_card</span>, <span =
class=3DSpellE>snake_card</span>]<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Now I've got a couple of functions for applying the
effects of the card to the Player's attributes, but I'm wondering
how "polite" I should make them.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>As it stands, the functions I <span =
class=3DGramE>have,</span>
take a look at the cards' innards and applies the effects to the =
Players
attributes. For instance the <span class=3DSpellE>applyCard</span> =
function...<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'># <span class=3DGramE>inside</span> =
Player<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:1'> &nbs=
p; </span><span
class=3DGramE>def</span> <span class=3DSpellE>applyCard</span>(self, =
deck, card):<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><span
class=3DSpellE>self.applied_<span =
class=3DGramE>cards.append</span></span><span
class=3DGramE>(</span><span =
class=3DSpellE>deck.pop</span>(card))<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><span
class=3DGramE>for</span> effect in <span =
class=3DSpellE>card.effects</span>:<br>
<span =
style=3D'mso-tab-count:3'> &nbs=
p; &nbs=
p; &nbs=
p; </span><span
class=3DSpellE>self.__dict</span>_<span class=3DGramE>_[</span>effect] =
=3D
card[effect]<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Instead of grubbing around inside of the card should =
the
Player politely ask the Card for the effect data and wait for an =
answer, then
apply what given to it to <span class=3DGramE>it's</span> =
attributes?<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Maybe something like the =
following...<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'># <span class=3DGramE>inside</span> =
Card<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:1'> &nbs=
p; </span><span
class=3DGramE>def</span> <span =
class=3DSpellE>reportEffects</span>(self):<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><span
class=3DGramE>return</span> <span =
class=3DSpellE>self.effects</span><o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'># <span class=3DGramE>inside</span> =
Player<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:1'> &nbs=
p; </span><span
class=3DGramE>def</span> <span class=3DSpellE>applyCard</span>(self, =
deck, card)<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:1'> &nbs=
p; </span><span
style=3D'mso-tab-count:1'> &nbs=
p; </span><span
class=3DSpellE>self.applied_<span =
class=3DGramE>cards.append</span></span><span
class=3DGramE>(</span><span =
class=3DSpellE>deck.pop</span>(card))<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><span
class=3DGramE>effects</span> =3D <span =
class=3DSpellE>card.reportEffects</span>()<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><span
class=3DGramE>for</span> effect in effects:<br>
<span =
style=3D'mso-tab-count:3'> &nbs=
p; &nbs=
p; &nbs=
p; </span><span
class=3DSpellE>self.__dict</span>_<span class=3DGramE>_[</span>effect] =
=3D effects[effect]<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I guess what I'm asking <span class=3DGramE>is =
:</span><span
style=3D'mso-spacerun:yes'> </span>Should "Communicate" with
each other like equals, or should they "Use" each other.<span
style=3D'mso-spacerun:yes'> </span>It seems that the more polite =
an object
is the easier it will be for the objects it deals with to change how =
they work
internally, but still retain functionality later on. =
<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>What would your suggestions be on this =
subject?<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Thanks,<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'> &nbs=
p; &nbs=
p; </span><o:p></o:p></span></font></p>
<p class=3DMsoAutoSig><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt;mso-no-proof:yes'><o:p> </o:p></span></font></p>
<p class=3DMsoAutoSig><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt;mso-no-proof:yes'><o:p> </o:p></span></font></p>
<p class=3DMsoAutoSig><font size=3D2 face=3D"Courier New"><span =
style=3D'font-size:
10.0pt;font-family:"Courier =
New";mso-no-proof:yes'>~</span></font><st1:country-region><st1:place><fo=
nt
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
=
mso-no-proof:yes'>Israel</span></font></st1:place></st1:country-region><=
font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
mso-no-proof:yes'>~<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>
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