How to use the jplephem.names.target_name_pairs function in jplephem

"""An interface between JPL ephemerides and Skyfield."""

import os
from collections import defaultdict

from jplephem.exceptions import OutOfRangeError
from jplephem.spk import SPK
from jplephem.names import target_name_pairs

from .constants import AU_KM, DAY_S
from .errors import EphemerisRangeError
from .timelib import calendar_date
from .vectorlib import VectorFunction, VectorSum, _jpl_code_name_dict

_jpl_name_code_dict = dict(
    (name, target) for (target, name) in target_name_pairs
)

class SpiceKernel(object):
    """Ephemeris file in NASA .bsp format.

    A "Spacecraft and Planet Kernel" (SPK) file from NASA provides
    (x,y,z) coordinates for bodies in the Solar System like the Sun,
    planets, moons, and spacecraft.

    You can download a .bsp file yourself and use this class to open it,
    or use the Skyfield ``load()`` function to automatically download a
    popular ephemeris.  Once loaded, you can print this object to the
    screen to see a report on the segments that it includes:

    >>> planets = load('de421.bsp')
    >>> print(planets)