'Return 0 if the leftmost argument of the first argument is a not a
q_creator, else 1 if it is above fermi or -1 if it is below fermi.
Examples
>>> from sympy import symbols
>>> from sympy.physics.secondquant import NO, F, Fd
>>> a = symbols(\'a\', above_fermi=True)
>>> i = symbols(\'i\', below_fermi=True)
>>> NO(Fd(a)*Fd(i)).has_q_creators
1
>>> NO(F(i)*F(a)).has_q_creators
-1
>>> NO(Fd(i)*F(a)).has_q_creators           #doctest: +SKIP
0'

@property
def has_q_creators(self):

    return self.args[0].args[0].is_q_creator
