I have this type of situation and wonder if I should use a global variable
outside the recursive function instead of passing the updated parameter
through.
I want to get a union of all the values that any 'things' key may have, even in
a nested dictionary (and I do not know beforehand how deep the nesting might
go):
d = {'things':1, 'two':{'things':2}}
def walk(obj, res):
if not hasattr(obj, 'keys'):
return set(), set()
if 'things' in obj:
res.add(obj['things'])
for k in obj:
walk(obj[k], res)
return res
walk(d, set()) # returns {1, 2}
Is it better to use a global to keep track of the values or does it even matter?
thanks,
--Tim
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