Dict comp help

[Leonard, Arah]

> Hi,
> Slightly different take on an old problem, I have a list of dicts, I need to build one dict from this based on two values from each dict in the list. Each of the dicts in the list have similar key names, but values of course differ.
> 
> 
> [{'a': 'xx', 'b': 'yy', 'c': 'zz'},  {'a': 'dd', 'b': 'ee', 'c': 'ff'}]
> 
> 
> { 'xx': 'zz', 'dd': 'ff'}
> 
> 
> Anyone have insight on how to pull this off?
> 
> 
> Thanks!
> jlc
> 

listy = [{'a':'xx', 'b':'yy', 'c':'zz'}, {'a':'dd', 'b':'ee','c':'ff'}]
kryten = {}
keys = []
for l in listy:
	for key in l.keys():
		if key not in keys: keys.append(key)
for key in keys:
	kryten[key] = ''
	for l in listy:
		kryten[key] += l.has_key(key) and l[key] or ''
print kryten