debug.py

def debug(s, *args, **kwargs):
	c_frame = inspect.getouterframes(inspect.currentframe(), 1)[1][0]
	c_args, c_varargs, c_varkw, c_locals = inspect.getargvalues(c_frame)
	d = dict(c_locals)
	if kwargs: d.update(kwargs)
	print s.format(*args, **d)

def foo():
    bar = 'world'
    debug('hello {bar}')

foo()