Getting a class from its name

Michael Hudson mwh at python.net
Wed Aug 21 11:37:47 CEST 2002


Henrik Motakef <henrik.motakef at web.de> writes:

> Hi,
> 
> I guess thats an easy one, but somehow I'm blocked.
> How do I get a class given its name (or an object of this class
> ultimatly)?
> 
> Say I have the string "xml.dom.Node", how do I use it to make a Node
> object?

s = 'xml.dom.Node'

First, split off the package name:

parts = s.split('.')
package = '.'.join(parts[:-1])
classname = parts[-1]

Import the package:

__import__(package)
mod = sys.modules[package]

Find the class:

klass = getattr(mod, classname)

(Inspiration from pickle.py:Unpickler.find_class).

HTH,
M.

-- 
81. In computing, turning the obvious into the useful is a living
    definition of the word "frustration".
  -- Alan Perlis, http://www.cs.yale.edu/homes/perlis-alan/quotes.html



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