Formatted string to object

[janama]

Hi,

can such a thing be done somehow?


aaa = self.aaa
bbb = %s.%s % ('parent', 'bbb')

Can you use strings or %s strings like in the above or

aaa = 'string'
aaa.%s() % 'upper'

Somehow?

Thanks for taking a look at this

Regards
Janama

[Tim Chase]

Re: Formatted string to object

> Can you use strings or %s strings like in the above or[color=blue]
>
> aaa = 'string'
> aaa.%s() % 'upper'
>
> Somehow?[/color]

Looks like you want to play with the eval() function.
[color=blue][color=green][color=darkred]
>>> aaa = 'hello'
>>> result = eval("aaa.%s()" % 'upper')
>>> result[/color][/color][/color]
'HELLO'

Works for your second example. May work on your first example too.

-tkc

[bruno at modulix]

Re: Formatted string to object

Tim Chase wrote:[color=blue][color=green]
>> Can you use strings or %s strings like in the above or
>>
>> aaa = 'string'
>> aaa.%s() % 'upper'
>>
>> Somehow?[/color]
>
>
> Looks like you want to play with the eval() function.
>[color=green][color=darkred]
>>>> aaa = 'hello'
>>>> result = eval("aaa.%s()" % 'upper')
>>>> result[/color][/color]
> 'HELLO'[/color]

Using eval() or exec should be really avoided whenever possible IMHO.
This one is best done with getattr(obj, attribute_name [,default]), ie:
[color=blue][color=green][color=darkred]
>>> aaa = "string"
>>> getattr(aaa, 'upper')()[/color][/color][/color]
'STRING'[color=blue][color=green][color=darkred]
>>>[/color][/color][/color]


--
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'onurb@xiludom. gro'.split('@')])"

[Steven Bethard]

Re: Formatted string to object

janama wrote:[color=blue]
> can such a thing be done somehow?
>
> aaa = self.aaa
> bbb = %s.%s % ('parent', 'bbb')
>
> Can you use strings or %s strings like in the above or
>
> aaa = 'string'
> aaa.%s() % 'upper'[/color]

Use the getattr() function::
[color=blue][color=green][color=darkred]
>>> class parent(object):[/color][/color][/color]
... class bbb(object):
... pass
...[color=blue][color=green][color=darkred]
>>> module_ns = __import__(__na me__)
>>> getattr(getattr (module_ns, 'parent'), 'bbb')[/color][/color][/color]
<class '__main__.bbb'>[color=blue][color=green][color=darkred]
>>> import string
>>> getattr(getattr (module_ns, 'string'), 'upper')[/color][/color][/color]
<function upper at 0x00B502B0>

I've imported the module itself here so you can use getattr, but you
could also use globals() instead of the inner getattr() call::
[color=blue][color=green][color=darkred]
>>> getattr(globals ()['parent'], 'bbb')[/color][/color][/color]
<class '__main__.bbb'>[color=blue][color=green][color=darkred]
>>> getattr(globals ()['string'], 'upper')[/color][/color][/color]
<function upper at 0x00B502B0>

HTH,

STeVe

[bruno at modulix]

Re: Formatted string to object

janama wrote:[color=blue]
> Hi,
>
> can such a thing be done somehow?
>
>
> aaa = self.aaa
> bbb = %s.%s % ('parent', 'bbb')[/color]

Given the first line, I assume this is inside a method body, and parent
is a local var. Then the answer is:

bbb = getattr(locals( )['parent'], 'bbb')

read the doc for these two functions to get more infos.
[color=blue]
> Can you use strings or %s strings like in the above or
>
> aaa = 'string'
> aaa.%s() % 'upper'
>
> Somehow?[/color]

Not directly - but here again, getattr() is your friend.


--
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'onurb@xiludom. gro'.split('@')])"

[janama]

Re: Formatted string to object

Thankyou everyone for help last time:

The following works ok when setting a
wx.lib.buttons. GenBitmapTextBu tton's disabled bitmap in using wxpython

instead of this:
self.b1.SetBitm apDisabled(self .yellow)

i can use this:
aaa = 1
result1 = eval("self.b%s. SetBitmapDisabl ed(self.yellow) " % aaa)
result

YAY!


How would i to achieve this with getattr() ?

getattr(locals( )['parent'], aaa) ???

Why would this be better as recommended in previous post here

http://groups.google.com.au/group/comp.lang.python/browse_frm/thread/2529515bc85cd954/c2f080b21d668081?q=janama&rnum=1#c2f080b21d668081

Any help appreciated

ta

[Scott David Daniels]

Re: Formatted string to object

janama wrote:[color=blue]
> i can use this:
> aaa = 1
> result = eval("self.b%s. SetBitmapDisabl ed(self.yellow) " % aaa)
>
> .... How would i to achieve this with getattr() ?[/color]

result = getattr(self, 'b%s' % aaa).SetBitmapD isabled(self.ye llow)

--Scott David Daniels
scott.daniels@a cm.org