Hello All,
I have been seeing this term "duck typing" for quite sometime now. It
will be nice if one of us can give an example in Python demonstrating
duck typing and/or link to some Python references.
Regards,
Srijit
10  3535 
<sr****@yahoo.com> wrote in message
news:22**************************@posting.google.c om... Hello All,
I have been seeing this term "duck typing" for quite sometime now. It
will be nice if one of us can give an example in Python demonstrating
duck typing and/or link to some Python references.
Why in the world would anyone want to do such a thing? I hadn't
heard the term until you just brought it up, so a quick Google defined
it. AFAICT, it's simply a cute name that's applied to a very common
technique in languages that don't use static typing.
In other words, if you need a file-like object, and someone passes
you an object, your options are either to just use it (and handle the
exceptions if it doesn't really support the proper interface) or use
reflection to see if it has methods with the proper name and number
of parameters, and then be prepared to handle the exceptions when
they don't do what you expect.
Six of one, half a dozen of the other.
John Roth
Regards,
Srijit
On Tue, Sep 16, 2003 at 02:01:18AM -0700, sr****@yahoo.com wrote: Hello All,
I have been seeing this term "duck typing" for quite sometime now. It
will be nice if one of us can give an example in Python demonstrating
duck typing and/or link to some Python references.
class Duck:
def quack(self):
print "Quack!"
class MeWearingSillyDuckOutfit:
def quack(self):
print "ummm... Quack!"
def make_it_quack(obj):
obj.quack()
a = Duck()
b = MeWearingSillyDuckOutfit()
make_it_quack(a)
make_it_quack(b)
"Oren Tirosh" <or*******@hishome.net> wrote ... On Tue, Sep 16, 2003 at 02:01:18AM -0700, sr****@yahoo.com wrote: Hello All,
I have been seeing this term "duck typing" for quite sometime now. It
will be nice if one of us can give an example in Python demonstrating
duck typing and/or link to some Python references.
class Duck:
def quack(self):
print "Quack!"
class MeWearingSillyDuckOutfit:
def quack(self):
print "ummm... Quack!"
def make_it_quack(obj):
obj.quack()
a = Duck()
b = MeWearingSillyDuckOutfit()
make_it_quack(a)
make_it_quack(b)
exquacktly [ducks and runs]
regards
--
Steve Holden http://www.holdenweb.com/
Python Web Programming http://pydish.holdenweb.com/pwp/
Steve Holden wrote:
exquacktly [ducks and runs]
^^^^^
Steve, did you even _know_ you did this? You're sick!
-Peter :-)
Peter Hansen wrote: Steve Holden wrote:
exquacktly [ducks and runs]
^^^^^
Steve, did you even _know_ you did this? You're sick!
-Peter :-)
people are currently turning their heads to me to see why I
suddenly bursted out in laughter :-)
--Irmen
"Peter Hansen" <pe***@engcorp.com> wrote in message
news:3F***************@engcorp.com... Steve Holden wrote:
exquacktly [ducks and runs]
^^^^^
Steve, did you even _know_ you did this? You're sick!
-Peter :-)
Aah, I see, you think I'm stupid.
Of course I knew - without the bracketed afterthought it would hardly have
been worth posting.
I'll send you a bill ;-)
regards
--
Steve Holden http://www.holdenweb.com/
Python Web Programming http://pydish.holdenweb.com/pwp/
Steve Holden wrote:
"Peter Hansen" <pe***@engcorp.com> wrote in message
news:3F***************@engcorp.com... Steve Holden wrote:
exquacktly [ducks and runs] ^^^^^
Steve, did you even _know_ you did this? You're sick!
-Peter :-)
Aah, I see, you think I'm stupid.
No, I just knew Irmen was asleep at his keyboard. ;-)
Of course I knew - without the bracketed afterthought it would hardly have
been worth posting.
I'll send you a bill ;-)
If you make it a twenty, would that be a "sawduck"?
-Peter
On Tue, Sep 16, 2003 at 03:47:11PM +0000, Steve Holden wrote: "Oren Tirosh" <or*******@hishome.net> wrote ... On Tue, Sep 16, 2003 at 02:01:18AM -0700, sr****@yahoo.com wrote: Hello All,
I have been seeing this term "duck typing" for quite sometime now. It
will be nice if one of us can give an example in Python demonstrating
duck typing and/or link to some Python references.
class Duck:
def quack(self):
print "Quack!"
class MeWearingSillyDuckOutfit:
def quack(self):
print "ummm... Quack!"
def make_it_quack(obj):
obj.quack()
a = Duck()
b = MeWearingSillyDuckOutfit()
make_it_quack(a)
make_it_quack(b)
exquacktly [ducks and runs]
class Run:
def quack(self):
print "QUACK!"
ducks = [Duck() for i in range(10)]
runs = [Run() for i in range(10)]
apply(make_it_quack, ducks+runs)
Oren
"Peter Hansen" <pe***@engcorp.com> wrote in message
news:3F***************@engcorp.com... Steve Holden wrote:
"Peter Hansen" <pe***@engcorp.com> wrote in message
news:3F***************@engcorp.com... Steve Holden wrote:
>
> exquacktly [ducks and runs]
^^^^^
Steve, did you even _know_ you did this? You're sick!
-Peter :-)
Aah, I see, you think I'm stupid.
No, I just knew Irmen was asleep at his keyboard. ;-)
Of course I knew - without the bracketed afterthought it would hardly
have been worth posting.
I'll send you a bill ;-)
If you make it a twenty, would that be a "sawduck"?
You'll never beat me at this game. After all, I did write "Web Programming
in Python" ;-)
regards
--
Steve Holden http://www.holdenweb.com/
Python Web Programming http://pydish.holdenweb.com/pwp/ This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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