How to use the asteval.__version__ function in asteval

#source_encoding = 'utf-8'

# The master toctree document.
master_doc = 'index'

# General information about the project.
project = u'asteval'
copyright = u'{}, Matthew Newville, The University of Chicago'.format(date.today().year)

# 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.
import asteval
release = asteval.__version__.split('+', 1)[0]


# The language for content autogenerated by Sphinx. Refer to documentation
# for a list of supported languages.
#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'

# List of documents that shouldn't be included in the build.
#unused_docs = []

# List of directories, relative to source directory, that shouldn't be searched