[Tutor] using **kwargs in __init__() as attributes

2007-10-01 Thread János Juhász 
Dear Tutors,

I would like to make a new class instance, where
the intance attributes coming from the kwargs hash.

class ADUser:
def __init__(self, **kwargs):
for key in kwargs.keys():
self.key = kwargs[k]

a = ADUser(name='papa')


It isn't working :(



Yours sincerely,
__
Janos Juhasz

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Re: [Tutor] using **kwargs in __init__() as attributes

2007-10-01 Thread Kent Johnson 
János Juhász wrote:
 Dear Tutors,
 
 I would like to make a new class instance, where
 the intance attributes coming from the kwargs hash.
 
 class ADUser:
 def __init__(self, **kwargs):
 for key in kwargs.keys():
 self.key = kwargs[k]

This sets the 'key' attribute of self to the value of the keyword. You 
want to use the value of of key as the attribute name. You can do this 
with setattr():

   setattr(self, key, kwargs[k])

You can also update all the kwargs at once with
   self.__dict__.update(kwargs)

 It isn't working :(

A more specific description of the problem is often helpful; for best 
results copy and paste the exact error message, including the traceback, 
into your email.

Kent
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Re: [Tutor] using **kwargs in __init__() as attributes

2007-10-01 Thread Dave Kuhlman 
On Mon, Oct 01, 2007 at 04:51:53PM +0200, J?nos Juh?sz wrote:
 Dear Tutors,
 
 I would like to make a new class instance, where
 the intance attributes coming from the kwargs hash.
 
 class ADUser:
 def __init__(self, **kwargs):
 for key in kwargs.keys():
 self.key = kwargs[k]
 

You are asking a more sophisticated form of a question that has
been asked on this list several times before: 

How do I create names in a namespace from string values?

It's likely that you do not really want (or need) to do this.  Try
the following instead:

def __init__(self, **kwargs):
self.values = kwargs

Then access the values with:

x = self.values['name']

or, safer:

x = self.values.get('name', 'no_name')

If you are determined to create names in a namespace, on the fly,
look at the exec command (http://docs.python.org/ref/exec.html).
But, that's a dangerous way to code.

Dave



-- 
Dave Kuhlman
http://www.rexx.com/~dkuhlman
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Re: [Tutor] using **kwargs in __init__() as attributes

2007-10-01 Thread Alan Gauld 

János Juhász [EMAIL PROTECTED] wrote

 class ADUser:
def __init__(self, **kwargs):
for key in kwargs.keys():
self.key = kwargs[k]

 a = ADUser(name='papa')


 It isn't working :(

Try using setattr instead of self.key assignment.

HTH,


-- 
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld 


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Re: [Tutor] using **kwargs in __init__() as attributes

2007-10-01 Thread Noufal Ibrahim 
János Juhász wrote:
 Dear Tutors,
 
 I would like to make a new class instance, where
 the intance attributes coming from the kwargs hash.
 
 class ADUser:
 def __init__(self, **kwargs):
 for key in kwargs.keys():
 self.key = kwargs[k]
 
 a = ADUser(name='papa')
 


Your snippet above will set the attribute key to kwargs[k] (it will 
overwrite the values for the previous keys so you won't get anywhere).

You need to use setattr to do this since the names of the attributes are 
available as strings. Here's an example.

  class Foo(object):
...   def __init__(self,**d):
...for i in d:
... setattr(self,i,d[i])
...
 
 
  x= Foo(name=Papa)
  x.name
'Papa'
 



-- 
~noufal
http://nibrahim.net.in/
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