app\auth\views(4).py

#...
from .forms import LoginForm, RegistrationForm, ChangePasswordForm,\
    PasswordResetRequestForm, PasswordResetForm, ChangeEmailForm
#...

@auth.route('/change-password', methods=['GET', 'POST'])
@login_required
def change_password():
    form = ChangePasswordForm()
    if form.validate_on_submit():
        if current_user.verify_password(form.old_password.data):
            current_user.password = form.password.data
            db.session.add(current_user)
            db.session.commit()
            flash('Your password has been updated.')
            return redirect(url_for('main.index'))
        else:
            flash('Invalid password.')
    return render_template("auth/change_password.html", form=form)


@auth.route('/reset', methods=['GET', 'POST'])
def password_reset_request():
    if not current_user.is_anonymous:
        return redirect(url_for('main.index'))
    form = PasswordResetRequestForm()
    if form.validate_on_submit():
        user = User.query.filter_by(email=form.email.data.lower()).first()
        if user:
            token = user.generate_reset_token()
            send_email(user.email, 'Reset Your Password',
                       'auth/email/reset_password',
                       user=user, token=token)
        flash('An email with instructions to reset your password has been '
              'sent to you.')
        return redirect(url_for('auth.login'))
    return render_template('auth/reset_password.html', form=form)


@auth.route('/reset/<token>', methods=['GET', 'POST'])
def password_reset(token):
    if not current_user.is_anonymous:
        return redirect(url_for('main.index'))
    form = PasswordResetForm()
    if form.validate_on_submit():
        if User.reset_password(token, form.password.data):
            db.session.commit()
            flash('Your password has been updated.')
            return redirect(url_for('auth.login'))
        else:
            return redirect(url_for('main.index'))
    return render_template('auth/reset_password.html', form=form)


@auth.route('/change_email', methods=['GET', 'POST'])
@login_required
def change_email_request():
    form = ChangeEmailForm()
    if form.validate_on_submit():
        if current_user.verify_password(form.password.data):
            new_email = form.email.data.lower()
            token = current_user.generate_email_change_token(new_email)
            send_email(new_email, 'Confirm your email address',
                       'auth/email/change_email',
                       user=current_user, token=token)
            flash('An email with instructions to confirm your new email '
                  'address has been sent to you.')
            return redirect(url_for('main.index'))
        else:
            flash('Invalid email or password.')
    return render_template("auth/change_email.html", form=form)


@auth.route('/change_email/<token>')
@login_required
def change_email(token):
    if current_user.change_email(token):
        db.session.commit()
        flash('Your email address has been updated.')
    else:
        flash('Invalid request.')
    return redirect(url_for('main.index'))