current_route_url.py

from pyramid.url import route_url
def current_route_url(request, route_name=None, *elements, **query):
    if not route_name:
        route_name = getattr(request, 'matched_route', None)
        route_name = getattr(route_name, 'name')
    matchdict = {}
    matchdict.update(getattr(request, 'matchdict', {}) or {})
    matchdict.update(query)
    return route_url(route_name, request, *elements, **matchdict)