python论文下载问题

运行’Python实现一个论文下载器‘文章里的代码出现如下问题 要怎么解决
原代码

        else:
            print('论文链接：%s' % downUrl)
            print('下载中...')
            pdf = download_article(downUrl)
            with open('%s.pdf' % request, 'wb') as f:
                f.write(pdf)
            print('---下载完成---')
        time.sleep(0.8)

问题

Traceback (most recent call last):
  File "C:/Users/86139/.PyCharmCE2018.3/config/scratches/scratch.py", line 92, in <module>
    with open('%s.pdf' % request, 'wb') as f:
FileNotFoundError: [Errno 2] No such file or directory: '10.1002/btpr.3138.pdf'

改路径啊。确定有10.1002这个文件夹？