def do_urlencode(value):
    """Escape strings for use in URLs (uses UTF-8 encoding).  It accepts both
    dictionaries and regular strings as well as pairwise iterables.

    .. versionadded:: 2.7
    """
    itemiter = None
    if isinstance(value, dict):
        itemiter = iteritems(value)
    elif not isinstance(value, string_types):
        try:
            itemiter = iter(value)
        except __HOLE__:
            pass
    if itemiter is None:
        return unicode_urlencode(value)
    return u'&'.join(unicode_urlencode(k) + '=' +
                     unicode_urlencode(v, for_qs=True)
                     for k, v in itemiter)
dataset/ETHPy150Open GoogleCloudPlatform/appengine-flask-skeleton/lib/jinja2/filters.py/do_urlencode