ref = {"fst": 1, "snd": 2}
print "first is {fst}, second is {snd}".format(**ref)

<warning descr="Too few arguments for format string">"{}"</warning>.format()
ref = {"fst": 1, "snd": 2}
print "first is {fst}, second is {snd}".format(**ref)

<warning descr="Too few arguments for format string">"{}"</warning>.format()