Return a jinja template ready for rendering. If needed, global variables are initialized.

    Parameters
    ----------
    template_name: str, the name of the template as defined in the templates mapping

    Returns
    -------
    The Jinja template ready for rendering

def template(template_name):
    """Return a jinja template ready for rendering. If needed, global variables are initialized.

    Parameters
    ----------
    template_name: str, the name of the template as defined in the templates mapping

    Returns
    -------
    The Jinja template ready for rendering
    """
    globals = None
    if template_name.startswith('row_'):
        # This is a row template setting global variable
        globals = dict()
        globals['vartype'] = var_type[template_name.split('_')[1].upper()]
    return jinja2_env.get_template(templates[template_name], globals=globals)