@bp.route('/settings/<username>', methods=['GET', 'POST'])
@login_required
def settings():
    profile = User.query.get_or_404(username)
    form = SettingsForm()
    if form.validate_on_submit():
        profile.email = form.email.data
        profile.location = form.location.data
        profile.website = form.website.data
        profile.bio = form.bio.data
        profile.twitter = form.twitter.data
        profile.weibo = form.weibo.data
        profile.github = form.github.data
        profile.instagram = form.instagram.data

        db.session.add(profile)
        db.session.commit()

        return redirect(url_for('main.index'))

就是那几行profile.xxx = form.xxx.data