Sample script of Ruby to use Python with PyCall.

pycall_sgp4.rb

#! /usr/local/bin/ruby

require 'pycall/import'
include PyCall::Import

pyfrom 'sgp4.earth_gravity', import: :wgs72
pyfrom 'sgp4.io', import: :twoline2rv

TLE_1 = "1 25544U 98067A   17293.55189421  .00016717  00000-0  10270-3 0  9004"
TLE_2 = "2 25544  51.6380 133.3720 0005197  35.8378 324.3123 15.54181626  1244"

satellite = twoline2rv(TLE_1, TLE_2, wgs72)
res = satellite.propagate(2017, 10, 21, 15, 44, 10)
position, velocity = res[0], res[1]
puts "ERROR:\n\t#{satellite.error}(#{satellite.error_message})"
puts "POSITION:\n\t#{position}"
puts "VOLOCITY:\n\t#{velocity}"