String interpolation in Python.

iformat.py

import inspect

def iformat(string):
    frame = inspect.currentframe()
    result = string.format(**dict(frame.f_back.f_globals, **frame.f_back.f_locals))
    del frame
    return result

class Object(object): pass

SOME_CONST = 12

def main():
    o = Object()
    o.foo = "hey!"
    shoe = dict(a=1, b="cat")
    print iformat('{SOME_CONST} - {o.foo} - {shoe[b]}')

if __name__ == '__main__':
    main()