Variable interpolation or indirection for instance attributes
google at moodring.com
Wed Feb 19 07:36:53 CET 2003
New to Python with a Perl background, and I've searched a good bit on
this and can't seem to find the answer. I'd like to know if it is
possible to use a variable to hold the name of an instance attribute
x = 'street'
self.x = '123 Albermarle Street'
such that x in self.x gets evaluated to 'street' and thus self.x
becomes actually self.street. I've seen a number of (possibly
outdated) language proposals about backticks and $ symbols. None of
these seem to work including (self.x), $self.x, self.$x, self.x$,
`self.x`, etc. I did see an external library mentioned that had a
short perhaps 4 character name begining with an 'i' like 'itrp', but
I'm stubbornly thinking that there must be a way within the language
to do it.
At the same time, I'd like to find a way to initialize many class
instance attribuites from a passed in dictionary, without just
creating a dictionary as a n instance attribute. And I really want to
beat this dead horse to understand whether or not these things are
possible, even if there is another way!
A more likely example:
self.props = ['extended','street','locality','region','postalcode']
self.extended = ''
self.street = ''
self.locality = ''
self.region = ''
for addresspart in address.keys():
self.(addresspart) = address[addresspart] # whishful
key = self.props[i]
return eval(self.key) # same here
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