'Return terms of series for self up to O(x**n) at x=0
from the positive direction.
This is a method that should be overridden in subclasses. Users should
never call this method directly (use .nseries() instead), so you don\'t
have to write docstrings for _eval_nseries().'

def _eval_nseries(self, x, n, logx):

    from sympy.utilities.misc import filldedent
    raise NotImplementedError(filldedent(('\n                                                                                    The    _eval_nseries    method    should    be    added    to\n                                                                                    %s    to    give    terms    up    to    O(x**n)    at    x=0\n                                                                                    from    the    positive    direction    so    it    is    available    when\n                                                                                    nseries    calls    it.' % self.func)))
