old_contents: import os
  from distutils.core import setup
  
  build_num = os.environ['CIRCLECI_BUILD_NUM']
  
  setup(
      name='pydobot',
      packages=['pydobot'],
      version='0.2.%s' % build_num,
      description='Python 3 library for Dobot Magician',
      author='Luis Mesas',
      author_email='luismesas@gmail.com',
      url='https://github.com/luismesas/pydobot',
      download_url='https://github.com/luismesas/pydobot/archive/0.2.%s.tar.gz' % build_num,
      keywords=['dobot', 'magician', 'robotics'],
      classifiers=[],
      install_requires=['pyserial']
  )
  
new_contents: import os
  from distutils.core import setup
  
  build_num = os.environ['CIRCLE_BUILD_NUM']
  
  setup(
      name='pydobot',
      packages=['pydobot'],
      version='0.2.%s' % build_num,
      description='Python 3 library for Dobot Magician',
      author='Luis Mesas',
      author_email='luismesas@gmail.com',
      url='https://github.com/luismesas/pydobot',
      download_url='https://github.com/luismesas/pydobot/archive/0.2.%s.tar.gz' % build_num,
      keywords=['dobot', 'magician', 'robotics'],
      classifiers=[],
      install_requires=['pyserial']
  )
  
subject: fix circleci environment variable usage