python - Modify query parameters in current GET request for new url -

i access page path /mypage?a=1&b=1&c=1. want create link similar url, parameters changed: /mypage?a=1&b=2&c=1, b changed 1 2. know how current arguments request.args, structure immutable, don't know how edit them. how make new link in jinja template modified query?

write function modifies current url's query string , outputs new url. add function template context can used in jinja templates.

from flask import request werkzeug import url_encode  @app.template_global() def modify_query(**new_values):     args = request.args.copy()      key, value in new_values.items():         args[key] = value      return '{}?{}'.format(request.path, url_encode(args)) 

<a href="{{ modify_query(b=2) }}">link updated "b"</a>