How to use the pyzotero.zotero.__version__ function in pyzotero

# for bi, hi, ri, ci, wi, ai, index in zip(b, h, r, c, w, a):
        for i in range(0, len(a)):
            ai = a[i]
            ai.bib = b[i]
            ai.html = h[i]
            ai.ris = r[i]
            ai.coins = c[i]
            ai.wikipedia = w[i]
            ai.txtstyle = {s: st[i] for s, st in h_style.items()}
            ai.plain = None
            if bib_style.lower() in ai.txtstyle:
                ai.plain = ai.txtstyle[bib_style.lower()]

        if not no_cache:
            make_sure_path_exists(os.path.dirname(cache_name))
            pickle.dump((datetime.now(), self.zotLastMod, bib_style, zotero.__version__, a),
                        open(cache_name, 'wb'))

        return a

# The encoding of source files.
#source_encoding = 'utf-8-sig'

# The master toctree document.
master_doc = 'index'

# General information about the project.
project = u'Pyzotero'
copyright = u'2011 – %s, %s' % (current_year, author)

# 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 = zot.__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.
#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 patterns, relative to source directory, that match files and
# directories to ignore when looking for source files.
exclude_patterns = ['_build']