'Returns a generator of `+=`, `=`, etc. or None if there is no operation.'

def yield_operators(self):

    first = self.children[1]
    if (first.type == 'annassign'):
        if (len(first.children) <= 2):
            return
        first = first.children[2]
    (yield first)
    for operator in self.children[3::2]:
        (yield operator)
