'Compute an asymptotic expansion around args0, in terms of self.args.
This function is only used internally by _eval_nseries and should not
be called directly; derived classes can overwrite this to implement
asymptotic expansions.'

def _eval_aseries(self, n, args0, x, logx):

    from sympy.utilities.misc import filldedent
    raise PoleError(filldedent(('\n                                                Asymptotic    expansion    of    %s    around    %s    is\n                                                not    implemented.' % (type(self), args0))))
