Hi all
I needed something similar to, but not quite the same as,
collections.namedtuple.
The differences are that namedtuple requires the 'names' to be provided at
creation time, and then lends itself to creating multiple instances of
itself. I wanted a more generic class where I could
On Mar 31, 7:49 am, Frank Millman fr...@chagford.com wrote:
Hi all
I needed something similar to, but not quite the same as,
collections.namedtuple.
The differences are that namedtuple requires the 'names' to be provided at
creation time, and then lends itself to creating multiple instances
lbolla lbo...@gmail.com wrote in message
news:f8011c0b-0b1b-4a4f-94ff-304c16ef9...@q16g2000yqq.googlegroups.com...
On Mar 31, 7:49 am, Frank Millman fr...@chagford.com wrote:
Hi all
When subclassing immutable types, you need to override __new__;
otherwise you need to override __init__.
lbolla a écrit :
class MyList(list):
def __init__(self, names, values):
list.__init__(self, values)
for name, value in zip(names, values):
setattr(self, name, value)
names = ['A', 'B', 'C']
values = ['a', 'b', 'c']
lst =
Frank Millman wrote in news:mailman.1360.1270018159.23598.python-
l...@python.org in comp.lang.python:
I came up with a simple solution that seems to work -
class MyTuple(tuple):
... def __new__(cls, names, values):
... for name, value in zip(names, values):
... setattr(cls,
On Mar 31, 2:02 am, Rob Williscroft r...@rtw.me.uk wrote:
Frank Millman wrote in news:mailman.1360.1270018159.23598.python-
l...@python.org in comp.lang.python:
I came up with a simple solution that seems to work -
class MyTuple(tuple):
... def __new__(cls, names, values):
...
Frank Millman fr...@chagford.com writes:
class MyList(list):
... def __new__(cls, names, values):
... for name, value in zip(names, values):
... setattr(cls, name, value)
... return list.__new__(cls, values)
Did you really mean to setattr the class here? If I'm guessing
On Mar 31, 8:49 am, Frank Millman fr...@chagford.com wrote:
Hi all
Thanks to all for the helpful replies.
Rob, you are correct, I had not realised I was adding attributes to the
class instead of the instance. Your alternative does work correctly. Thanks.
Carl, I understand your concern
On Thu, 03 Sep 2009 17:10:12 +, Kreso wrote:
I would prefer that resulting object m belonged to myclist class.
How to obtain such behaviour? Must I somehow implement __getslice__
method myself?
Yes; you should also implement __getitem__(), as this is used for extended
slices.
--
I am subclassing list class and it basically works, but I don't
understand why after splicing these mylist objects I don't get
returned mylist objects. What I get are list objects:
class mylist(list):
def __init__(self):
list.__init__(self)
k = mylist()
k.append(1)
k.append(2
On 9/3/2009 10:10 AM Kreso said...
I am subclassing list class and it basically works, but I don't
understand why after splicing these mylist objects I don't get
returned mylist objects. What I get are list objects:
snip
I would prefer that resulting object m belonged to myclist class.
How
Kreso kknowayu...@donoevil.com wrote:
[...]
I would prefer that resulting object m belonged to myclist class.
I forgot to add that mylist instances in my case have some attributes (that's
why I need special container class in the first place) which should be
preserved after splicing.
In my
Hello everyone,
I'm creating a class which is subclassed from list (Bulit-in type).
It works great.
However, I'm having a hard time finding a way to set a new value to
the object (within the class).
There are methods that alter a part of the object (ex. __setitem__()).
But I couldn't find any
On Tue, Jan 6, 2009 at 12:34 PM, akineko akin...@gmail.com wrote:
Hello everyone,
I'm creating a class which is subclassed from list (Bulit-in type).
It works great.
However, I'm having a hard time finding a way to set a new value to
the object (within the class).
There are methods that
akineko wrote:
Hello everyone,
I'm creating a class which is subclassed from list (Bulit-in type).
It works great.
However, I'm having a hard time finding a way to set a new value to
the object (within the class).
There are methods that alter a part of the object (ex. __setitem__()).
But I
On Tue, 2009-01-06 at 12:34 -0800, akineko wrote:
Hello everyone,
I'm creating a class which is subclassed from list (Bulit-in type).
It works great.
However, I'm having a hard time finding a way to set a new value to
the object (within the class).
There are methods that alter a part of
Hello Chris and James,
Thank you for you guys' prompt response.
Yes, that is what I wanted to do.
I, somehow, didn't think of using those list methods.
Instead, I was looking for a single method to override.
Big Thanks!
Aki-
On Jan 6, 12:43 pm, Chris Rebert c...@rebertia.com wrote:
If you
Hamish McKenzie wrote:
I want to write a Vector class and it makes the most sense to just
subclass list. I also want to be able to instantiate a vector using either:
Vector( 1, 2, 3 )
OR
Vector( [1, 2, 3] )
so I have this:
class Vector(list):
def __new__( cls, *a ):
try:
Hamish McKenzie wrote:
I want to write a Vector class and it makes the most sense to just
subclass list. I also want to be able to instantiate a vector using either:
Vector( 1, 2, 3 )
OR
Vector( [1, 2, 3] )
so I have this:
class Vector(list):
def
I want to write a Vector class and it makes the most sense to just subclass
list. I also want to be able to instantiate a vector using either:
Vector( 1, 2, 3 )
OR
Vector( [1, 2, 3] )
so I have this:
class Vector(list):
def __new__( cls, *a ):
try:
I want to write a Vector class and it makes the most sense to just subclass
list. I also want to be able to instantiate a vector using either:
Vector( 1, 2, 3 )
OR
Vector( [1, 2, 3] )
so I have this:
class Vector(list):
def __new__( cls, *a ):
try:
print a
Hamish McKenzie [EMAIL PROTECTED] writes:
I want to write a Vector class and it makes the most sense to just
subclass list. I also want to be able to instantiate a vector using
either:
Vector( 1, 2, 3 )
OR
Vector( [1, 2, 3] )
so I have this:
class Vector(list):
def __new__(
On Jun 13, 8:43 pm, Matimus [EMAIL PROTECTED] wrote:
...chop...
So, it looks like as long as you want to subclass list, you are stuck
implementing both __*slice__ and __*item__ methods.
Matt
Thanks. That was clear and concise, just what I needed.
--
Matimus [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
| So, it looks like as long as you want to subclass list, you are stuck
| implementing both __*slice__ and __*item__ methods.
Unless writing in 3.0, where they have finally disappeared.
--
On Jun 13, 1:38 pm, Mike Kent [EMAIL PROTECTED] wrote:
For Python 2.5 and new-style classes, what special method is called
for mylist[2:4] = seq and for del mylist[2:4] (given that mylist is a
list, and seq is some sequence)?
I'm trying to subclass list, and I'm having trouble determining
For Python 2.5 and new-style classes, what special method is called
for mylist[2:4] = seq and for del mylist[2:4] (given that mylist is a
list, and seq is some sequence)?
I'm trying to subclass list, and I'm having trouble determining what
special methods I have to override in my class for the
En Fri, 13 Jun 2008 15:38:15 -0300, Mike Kent [EMAIL PROTECTED] escribió:
For Python 2.5 and new-style classes, what special method is called
for mylist[2:4] = seq and for del mylist[2:4] (given that mylist is a
list, and seq is some sequence)?
I'm trying to subclass list, and I'm having
On Jun 13, 11:38 am, Mike Kent [EMAIL PROTECTED] wrote:
For Python 2.5 and new-style classes, what special method is called
for mylist[2:4] = seq and for del mylist[2:4] (given that mylist is a
list, and seq is some sequence)?
I'm trying to subclass list, and I'm having trouble determining
I want to subclass list so that each value in it is calculated at call
time. I had initially thought I could do that by defining my own
__getitem__, but 1) apparently that's deprecated (although I can't
find that; got a link?), and 2) it doesn't work.
For example:
class Foo(list):
... def
On Apr 25, 4:03 pm, Kirk Strauser [EMAIL PROTECTED] wrote:
I want to subclass list so that each value in it is calculated at call
time. I had initially thought I could do that by defining my own
__getitem__, but 1) apparently that's deprecated (although I can't
find that; got a link?), and 2)
On Apr 25, 7:03 am, Kirk Strauser [EMAIL PROTECTED] wrote:
I want to subclass list so that each value in it is calculated at call
time. I had initially thought I could do that by defining my own
__getitem__, but 1) apparently that's deprecated (although I can't
find that; got a link?), and 2)
Hi,
I have a simple class that subclasses list:
class CaListOfObj(list):
subclass of list
def __init__(self, *args, **kwargs):
list.__init__(self, *args, **kwargs)
a = CaListOfObj([1,2,3])
I want an instance method to be run EVERY time a is modified. Is this
possible?
Hi,
I have a simple class that subclasses a list:
class CaListOfObj(list):
subclass of list
def __init__(self, *args, **kwargs):
list.__init__(self, *args, **kwargs)
a= CaListOfObj([1,2,3])
Is it possible to have a method in the class that is called EVERY time
a is modified?
test
--
http://mail.python.org/mailman/listinfo/python-list
Gerard Flanagan wrote:
Hello all
Could anyone shed any light on the following Exception? The code which
caused it is below. Uncommenting the 'super' call in 'XmlNode' gives
the same error. If I make XmlNode a subclass of 'object' rather than
'list' then the code will run.
Thanks in
Simon Percivall wrote:
The error you're seeing is because you've rebound 'list' to something
else. Try putting list = type([]) somewhere above your code.
That's it! I had rebound 'list' earlier (in error), and though I
deleted the code it must have been remembered somehow. Restarting
Hello all
Could anyone shed any light on the following Exception? The code which
caused it is below. Uncommenting the 'super' call in 'XmlNode' gives
the same error. If I make XmlNode a subclass of 'object' rather than
'list' then the code will run.
Thanks in advance.
Exception:
Traceback
Gerard Flanagan wrote:
Hello all
Could anyone shed any light on the following Exception? The code which
caused it is below. Uncommenting the 'super' call in 'XmlNode' gives
the same error. If I make XmlNode a subclass of 'object' rather than
'list' then the code will run.
...
Code:
Steve Juranich wrote:
Gerard Flanagan wrote:
Hello all
Could anyone shed any light on the following Exception? The code which
caused it is below. Uncommenting the 'super' call in 'XmlNode' gives
the same error. If I make XmlNode a subclass of 'object' rather than
'list' then the
The error you're seeing is because you've rebound 'list' to something
else. Try putting list = type([]) somewhere above your code.
--
http://mail.python.org/mailman/listinfo/python-list
I've googled like crazy and can't seem to find an answer to why this
isn't working.
I want to create a custom list class that acts as a circular list.
ie: my_list = (0, 1, 2)
how I want it to behave:
my_list[0] - 0
my_list[1] - 1
my_list[2] - 2
my_list[3] - 0
my_list[4] - 1
...etc
so, what
spike wrote:
I've googled like crazy and can't seem to find an answer to why this
isn't working.
I want to create a custom list class that acts as a circular list.
ie: my_list = (0, 1, 2)
how I want it to behave:
my_list[0] - 0
my_list[1] - 1
my_list[2] - 2
my_list[3] - 0
spike wrote:
I've googled like crazy and can't seem to find an answer to why this
isn't working.
I want to create a custom list class that acts as a circular list.
ie: my_list = (0, 1, 2)
Perhaps you mean [0, 1, 2]
how I want it to behave:
my_list[0] - 0
my_list[1] - 1
my_list[2]
You also need to post the code that raises the error, or no one else can
debug it.
sorry, I thought I had pasted that line in there, but I guess I missed
it. Here's the full code (after modifying it slightly based on your
post):
#! /usr/bin/env python
def circular_list(list):
def
spike grobstein wrote:
You also need to post the code that raises the error, or no one else can
debug it.
sorry, I thought I had pasted that line in there, but I guess I missed
it. Here's the full code (after modifying it slightly based on your
post):
#! /usr/bin/env python
def
Hi,
I want to subclass list. The documentation states to prefer subclassing
list instead of UserList. How to you clear the contents of a list subclass
without creating a new object?
Thanks in advance
Uwe
--
http://mail.python.org/mailman/listinfo/python-list
class newList(list):
def clear(self):
self[:] = []
is one way.
HTH
Regards,
Fuzzy
http://www.voidspace.org.uk/python/index.shtml
--
http://mail.python.org/mailman/listinfo/python-list
[Uwe]
How [do] you clear the contents of a list subclass
without creating a new object?
Use the paranoia emoticon: del x[:]. For example:
class L(list):
... pass
...
x = L()
x.append(Spam)
del x[:]
x
[]
type(x)
class '__main__.L'
with-thanks-to-Gordon-McMillan-ly y'rs,
--
Richie
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