r = {}
for x in a: if x not in b: r[x] = r[a]
for x in b: if x not in a: r[x] = r[b]
I know, this is wrong :-]
This looks better:
r = {}
for x in a: if x not in b: r[x] = a[x]
for x in b: if x not in a: r[x] = b[x]
Bearophile
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