On Mar 11, 5:02 pm, Gnarlodious <gnarlodi...@gmail.com> wrote: > I am trying to grok this documentation but need > help:http://docs.python.org/library/collections.html#defaultdict-examples > > In a perfect world the dict looks like this: > plistDict={'Style':'ExternalURL', 'Ref':'http://Gnarlodious.com/', > 'Tip':'Opens in a new window', 'Text':'Gnarlodious.com'} > > Let's say I want to prep a dict from a plist to insert the values into > an HTML link string: > "<a class='%(Style)s' href='%(Ref)s' title='%(Tip)s'>%(Text)s</a>" % > plistDict > > However, in this imperfect world the dict might look like this: > plistDict={'Ref':'http://Gnarlodious.com/', 'Text':'Gnarlodious.com'} > > which would error: > KeyError: 'Style' > > So using defaultdict: > from collections import defaultdict > > How do create a dict assigning every missing key with a default > string?
"<a class='%(Style)s' href='%(Ref)s' title='%(Tip)s'>%(Text)s</a>" % defaultdict(lambda:'_MISSING_', plistDict) HTH, George -- http://mail.python.org/mailman/listinfo/python-list
