keyerror '__repr__'
hi
i have this class book
class book:
def __init__(self,name,price):
self.name = name
self.price = price
def __getattr__(self,attr):
if attr == '__str__':
print 'intercepting in-built method call '
return '%s:%s' %
(object.__getattribute__(self,'name'),object.__getattribute___(self,'price'))
else:
return self.__dict__[attr]
>>>b = book('the tempest',234)
>>>b
Traceback (most recent call last):
File "", line 1, in
File "", line 11, in __getattr__
KeyError: '__repr__'
i am missing on a concept here. please enlighten me.
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Coercing one object to type of another
Hi
Inside a function i get a two arguments, say arg1 and arg2, how can i convert
arg2 to same type as arg1 ?
I dont know type of arg1 or arg2 for that matter, I just want to convert arg2
to type of arg1 if possible and handle the exception if raised.
Also:
>>> int('2')
2
>>> float('2.0')
2.0
>>> coerce(2,2.0)
(2.0,2.0)
but coerce('2',2) fails.If int('2') equals 2, why should it fail ?
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Re: Coercing one object to type of another
On Saturday, February 9, 2013 4:13:28 PM UTC+5:30, Chris Angelico wrote:
> On Sat, Feb 9, 2013 at 9:29 PM, Vijay Shanker wrote:
>
> > Hi
>
> > Inside a function i get a two arguments, say arg1 and arg2, how can i
> > convert arg2 to same type as arg1 ?
>
> > I dont know type of arg1 or arg2 for that matter, I just want to convert
> > arg2 to type of arg1 if possible and handle the exception if raised.
>
> > Also:
>
> >>>> int('2')
>
> > 2
>
> >>>> float('2.0')
>
> > 2.0
>
> >>>> coerce(2,2.0)
>
> > (2.0,2.0)
>
> > but coerce('2',2) fails.If int('2') equals 2, why should it fail ?
>
>
>
> You can get the type of any object, and call that:
>
>
>
> def coerce(changeme,tothis):
>
> return type(tothis)(changeme)
>
>
>
> ChrisA
well it will always return me this:
what i want is if i know arg1 is of string type(and it can be of any type, say
list, int,float) and arg2 is of any type, how can i convert it to type of arg1,
if arg1='hello world', type(arg1).__name__ will give me 'str', can i use this
to convert my arg2 to this type, w/o resorting to if-elif conditions as there
will be too many if-elif-else and it doesn really sounds a great idea !
thanks
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Python Learning Environment
Hi, My Linux box is ubuntu system. I want to create a development environment on my system for python programing language. I got to see there are two versions of python language 1. python 2.5.6 2. python 3.1.2 To find out what version i look in to my "/usr/bin" folder. There are many entries for python command - python - python2 - python2.5 - python2.6 - python3 - python3.1 what does this mean? I am able to run run my first program with all these command. should i remove all these and have the latest one? I am confused about these finding. Is this okay to have these all? Regards, Vijay Shanker Dubey -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Learning Environment
Thanks friend, Got the point. Regards, Vijay Shanker Dubey On Sat, Apr 17, 2010 at 11:31 PM, Krister Svanlund < krister.svanl...@gmail.com> wrote: > On Sat, Apr 17, 2010 at 7:06 PM, Vijay Shanker Dubey > wrote: > > Yes you are right about symlink thing. > > So what should I do for a clever developer environment? > > Should I change that python link to python3 or python3.1? > > > > Regards, > > Vijay Shanker Dubey > > > > It all depends on what you want to do. I would say that you shouldn't > change your python link at all, if you want to run a python script > using 3.1 just call the script using python3 as an interpreter. > -- > http://mail.python.org/mailman/listinfo/python-list > -- http://mail.python.org/mailman/listinfo/python-list
