Hi all,
I'm trying to make a float-like class (preferably a subclass of
'float') that wraps around. The background: I'm modeling a
multi-dimensional space, and some of those dimensions are circular.
Here is my code so far:
class WrapFloat(float ):
def __init__(self, value, wrap = None):
float.__init__( self, value)
self.wrap = wrap
The problem is this:
Python 2.4.1 (#2, Mar 30 2005, 21:51:10)
[GCC 3.3.5 (Debian 1:3.3.5-8ubuntu2)] on linux2
Type "help", "copyright" , "credits" or "license" for more information. from engine.geometry import WrapFloat WrapFloat(45)
45.0 WrapFloat(45, 3)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: float() takes at most 1 argument (2 given)
So my question to you is: how can I change my code so I can pass two
values to the WrapFloat constructor?
Thanks in advance,
Sybren
--
The problem with the world is stupidity. Not saying there should be a
capital punishment for stupidity, but why don't we just take the
safety labels off of everything and let the problem solve itself?
Frank Zappa 3 3478
On Sat, 17 Sep 2005 11:12:34 +0200, Sybren Stuvel <sy****@localho st.localdomain> wrote: Hi all,
I'm trying to make a float-like class (preferably a subclass of 'float') that wraps around. The background: I'm modeling a multi-dimensional space, and some of those dimensions are circular.
Here is my code so far:
class WrapFloat(float ): def __init__(self, value, wrap = None): float.__init__( self, value) self.wrap = wrap
The problem is this:
Python 2.4.1 (#2, Mar 30 2005, 21:51:10) [GCC 3.3.5 (Debian 1:3.3.5-8ubuntu2)] on linux2 Type "help", "copyright" , "credits" or "license" for more information. from engine.geometry import WrapFloat WrapFloat(45)45.0 WrapFloat(45, 3)
Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: float() takes at most 1 argument (2 given)
So my question to you is: how can I change my code so I can pass two values to the WrapFloat constructor?
Float is an immutable, so you need to override __new__
Regards,
Bengt Richter
Sybren Stuvel wrote: Hi all,
I'm trying to make a float-like class (preferably a subclass of 'float') that wraps around. The background: I'm modeling a multi-dimensional space, and some of those dimensions are circular.
Here is my code so far:
class WrapFloat(float ): def __init__(self, value, wrap = None): float.__init__( self, value) self.wrap = wrap
The problem is this:
Python 2.4.1 (#2, Mar 30 2005, 21:51:10) [GCC 3.3.5 (Debian 1:3.3.5-8ubuntu2)] on linux2 Type "help", "copyright" , "credits" or "license" for more information.
from engine.geometry import WrapFloat WrapFloat(4 5) 45.0 WrapFloat(4 5, 3)
Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: float() takes at most 1 argument (2 given)
So my question to you is: how can I change my code so I can pass two values to the WrapFloat constructor?
You also have to override __new__ I think. It automatically gets passed
the arguments to __init__. C.f. http://www.python.org/2.2/descrintro.html#__new__
In [11]: class WrapFloat(float ):
....: def __new__(cls, value, *args, **kwds):
....: return float.__new__(c ls, value)
....: def __init__(self, value, wrap=None):
....: float.__init__( self, value)
....: self.wrap = wrap
....:
In [12]: x = WrapFloat(45, 3)
In [13]: x
Out[13]: 45.0
In [14]: x.wrap
Out[14]: 3
--
Robert Kern rk***@ucsd.edu
"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter
Bengt Richter enlightened us with: Float is an immutable, so you need to override __new__
Thanks, that works!
Sybren
--
The problem with the world is stupidity. Not saying there should be a
capital punishment for stupidity, but why don't we just take the
safety labels off of everything and let the problem solve itself?
Frank Zappa This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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