A python Pyramid tween to redirect routes that end in a slash to not end in a slash

trailing_slash_tween.py

# -*- coding: utf-8 -*-
from pyramid.httpexceptions import HTTPMovedPermanently

from urllib.parse import urlunparse
from urllib.parse import urlparse


def trailing_slash_tween(handler, registry):
    """Redirect any route ending with a / to not have a slash."""
    def tween(request):
        if not request.path.endswith('/') or request.path == '/':
            return handler(request)

        return HTTPMovedPermanently(
            urlunparse(urlparse(request.url)._replace(path=request.path[:-1]))
        )

    return tween