Concise string interpolation in python

gistfile1.py

def tostr(msg, inhash=locals()):
  import io
  outstr = io.StringIO()
  print(outstr, msg % inhash)
  return outstr.getvalue()

usage example:

s="Some message from %(froma)s \n on the %(day)d of %(month)s %(year)d \n Says %(message)s\n"

froma="Steven Iceberg" ; day=15; month="September"; year=1987; message="I'm thinking of doing another Indiana Jones Movie"


tostr(s)

updated to python3