How to call functions with list and keyword arguments?

[John Z. Smith]

Hi,
I want to subclass a class (more precisely, optparse.Option). that looks
like

class Option:
def __init__(self, *opts, **attrs):
do_something()
I want to do something in my __init__ and and also call Option.__init__.
Then I don't know how to pass the arguments. For example,

class MyOption:
def __init__(self, *opts, **attrs):
do_my_own_thing()
Option.__init__(self, opts, attrs)

does not work (and you know why). I figured out some very ugly ways to do
this
but I believe there should be an elegant way to pass the argments to
superclass.

[anton muhin]

John Z. Smith wrote:

Hi,
I want to subclass a class (more precisely, optparse.Option). that looks
like

class Option:
def __init__(self, *opts, **attrs):
do_something()
I want to do something in my __init__ and and also call Option.__init__.
Then I don't know how to pass the arguments. For example,

class MyOption:
def __init__(self, *opts, **attrs):
do_my_own_thing()
Option.__init__(self, opts, attrs)

does not work (and you know why). I figured out some very ugly ways to do
this
but I believe there should be an elegant way to pass the argments to
superclass.

Option.__init__(self, *opts, **attrs) should work. BTW, some purists
recommend to use super ;)

hth,
anton.

[John Z. Smith]

Thanks. I didn't event know that's legal syntax. Just checked the tutorial
and reference
manual but didn't find it. Could you point me to it? Thanks again.

"anton muhin" <an********************************@rambler.ru> wrote in
message news:bq**********@news.peterlink.ru...

John Z. Smith wrote:

Hi,
I want to subclass a class (more precisely, optparse.Option). that looks like

class Option:
def __init__(self, *opts, **attrs):
do_something()
I want to do something in my __init__ and and also call Option.__init__.
Then I don't know how to pass the arguments. For example,

class MyOption:
def __init__(self, *opts, **attrs):
do_my_own_thing()
Option.__init__(self, opts, attrs)

does not work (and you know why). I figured out some very ugly ways to do this
but I believe there should be an elegant way to pass the argments to
superclass.

Option.__init__(self, *opts, **attrs) should work. BTW, some purists
recommend to use super ;)

hth,
anton.

[anton muhin]

John Z. Smith wrote:

Thanks. I didn't event know that's legal syntax. Just checked the tutorial
and reference
manual but didn't find it. Could you point me to it? Thanks again.

You're welcome.

In my ActiveState distributive it's under Python Documentation\Language
Reference\Expressions\Primaries\Calls. I hope ActiveState follows
standard reference.

regards,
anton.

[Robin Munn]

John Z. Smith <jz*****@optonline.net> wrote:

Thanks. I didn't event know that's legal syntax. Just checked the tutorial
and reference
manual but didn't find it. Could you point me to it? Thanks again.

Looking through the manual myself, it's a little hard to find. The tutorial
mentions the *args syntax in section 4.7.4:

http://www.python.org/doc/current/tu...00000000000000

but never mentions the **kwargs syntax at all that I could find. I believe
the tutorial could stand to be updated in that respect, maybe by expanding
section 4.7.4. If the *args syntax is in there, **kwargs should be also.

The language reference has mentions the syntax in the section on callable
objects, 5.3.4:

http://www.python.org/doc/current/ref/calls.html

And finally, the extended call syntax is mentioned in the description of the
builtin function apply(), as the reason why apply() is now deprecated:

http://www.python.org/doc/current/li...-in-funcs.html

--
Robin Munn
rm***@pobox.com