Special function for Vardan

gistfile1.py

def fun(teff=None, mass=None):
	if teff and mass:
		# gave two parameters
		pass  # goto 1
	elif teff:
		# don't have mass, have teff
		mass = f(teff)
	elif mass:
		# don't have teff, have mass
		# teff = f(mass)

	# (1)
	# you have both teff and mass defined


fun(2., 1.) # teff=2, mass=1
fun(teff=2., mass=3.) # teff=2, mass=3
fun(mass=4., teff=0.) # ...