On Wed, 11 May 2005, Bernard Lebel wrote:
> Let say I have several class instances in a list, and these class > instances have an attribute named "value", whose value is an integer. > > I would like to know if it is possible to loop over the list of > instances to change their "value" attribute, using a map( ( lambda:...), > ... ) type of loop. Hi Bernard, Hmmm... then map() is probably not what you want. map() is meant to transform a list of things into another list of things, but isn't really meant to mutate its input. It is possible to abuse map() to do what you're trying to do, using the setattr() function: ###### Pseudocode map(lambda instance: setattr(instance, 'value', 42)) ###### but this is definitely language abuse. *grin* map() is not intended to be run just to affect changing assignments on its input. It'll probably be clearest in Python just to write out the loop explicitely. Best of wishes to you! _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
