How to use the habanero.__version__ function in habanero

def make_ua(mailto = None, ua_string = None):
    requa = 'python-requests/' + requests.__version__
    habua = 'habanero/%s' % __version__
    ua = requa + ' ' + habua
    if mailto is not None:
      ua = ua + " (mailto:%s)" % mailto
    if ua_string is not None:
      if not isinstance(ua_string, str):
        raise TypeError("ua_string must be a str")
      ua = ua + " " + ua_string
    strg = {
      'User-Agent': ua,
      'X-USER-AGENT': ua
    }
    return strg

#source_encoding = 'utf-8-sig'

# The master toctree document.
master_doc = 'index'

# General information about the project.
project = u'habanero'
copyright = u'2017, Scott Chamberlain'
author = u'Scott Chamberlain'

# The version info for the project you're documenting, acts as replacement for
# |version| and |release|, also used in various other places throughout the
# built documents.
#
# The short X.Y version.
version = habanero.__version__
# The full version, including alpha/beta/rc tags.
release = version

# The language for content autogenerated by Sphinx. Refer to documentation
# for a list of supported languages.
#
# This is also used if you do content translation via gettext catalogs.
# Usually you set "language" from the command line for these cases.
language = None

# There are two options for replacing |today|: either, you set today to some
# non-false value, then it is used:
#today = ''
# Else, today_fmt is used as the format for a strftime call.
#today_fmt = '%B %d, %Y'