String formatting with two dictionaries?

Carsten Gaebler clpy at
Mon Oct 8 10:42:28 CEST 2001

Hi there!

Given a string

s = "%(foo)s %(spam)s"

and two dictionaries

d1 = {"foo": "bar"}
d2 = {"spam": "eggs"}

how would you apply d1 and d2 to s without modifying or explicitly
copying one of the dicts? I mean, I don't like to

d3 = dictionary(d1)
s = s % d3


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