check_env.py

import numpy
import matplotlib
import scipy  # things like coordinates matching, modeling, convolution use this
import astropy
from distutils import version

# Astropy version 0.3.2 or later, and 0.4.0 for coordinates
astropy_version = version.LooseVersion(astropy.__version__)
if astropy_version < version.LooseVersion('0.3.2'):
    print('Error: astropy version 0.3.2 or later is required, you have {0}'
          .format(astropy.__version__))
if astropy_version < version.LooseVersion('0.4.0'):
    print('Warning: astropy version 0.4.0 is later is needed for the '
          'coordinates part of the tutorial, you have {0}.  Consider installing 0.4 '
          'if you want to do the coordinates exercises.'.format(astropy.__version__))

# BeautifulSoup4 for one bit of the ASCII tables section.
try:
    import bs4
except ImportError:
    print('Warning: BeautifulSoup4 is not installed, so you will not be able to '
          'run the example for reading HTML tables.  This is not required.')