@api.route('/posts/')
def get_posts():
    page = request.args.get('page', 1, type=int)
    pagination = Post.query.paginate(
        page, per_page=current_app.config['FLASKY_POSTS_PER_PAGE'],
        error_out=False)
    posts = pagination.items
    prev = None
    if pagination.has_prev:
        prev = url_for('api.get_posts', page=1-page, _external=True)
    next = None
    if pagination.has_next:
        next = url_for('api.get_posts', page=page+1, _external=True)
    return jsonify({
        'posts': [post.to_json() for post in posts],
        'prev': prev,
        'next': next,
        'count': pagination.total
    })
dataset/ETHPy150Open RoseOu/flasky/app/api_1_0/posts.py/get_posts/swapped operands of `-`