def load(self, requirements_file=None):
        """Load or reload requirements from a requirements.txt file.

        :param requirements_file: if not given, the filename used from
            initialization will be read again.
        """
        if requirements_file is None:
            requirements_file = self.filename
            if requirements_file is None:
                raise ValueError("no filename provided")
        elif isinstance(requirements_file, text_type):
            requirements_file = Path(requirements_file)
        self.clear()
        with requirements_file.open() as f:
            self.loads(f.read())

        if isinstance(requirements_file, (text_type, Path)):
            self.filename = requirements_file
def edit_forum(forum_id):
    forum = Forum.query.filter_by(id=forum_id).first_or_404()

    form = EditForumForm(forum)
    if form.validate_on_submit():
        form.save()
        flash(_("Forum updated."), "success")
        return redirect(url_for("management.edit_forum", forum_id=forum.id))
    else:
        if forum.moderators:
            form.moderators.data = ",".join([
                user.username for user in forum.moderators
            ])
        else:
            form.moderators.data = None

    return render_template("management/forum_form.html", form=form,
                           title=_("Edit Forum"))