批量下载b站视频列表，下载第二个的时候报错：
    raise URLError(‘unknown url type: %s’ % type)
    urllib.error.URLError: <urlopen error unknown url type: [‘https>

    加上—debug，输出的错误信息为：

    1. Traceback (most recent call last):
    2.   File "/home/xiongz/anaconda3/bin/you-get", line 11, in <module>
    3.     sys.exit(main())
    4.   File "/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/__main__.py", line 92, in main
    5.     main(**kwargs)
    6.   File "/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/common.py", line 1831, in main
    7.     script_main(any_download, any_download_playlist, **kwargs)
    8.   File "/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/common.py", line 1719, in script_main
    9.     **extra
    10.   File "/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/common.py", line 1343, in download_main
    11.     download_playlist(url, **kwargs)
    12.   File "/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/common.py", line 1827, in any_download_playlist
    13.     m.download_playlist(url, **kwargs)
    14.   File "/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/extractors/bilibili.py", line 620, in download_playlist_by_url
    15.     self.__class__().download_by_url(purl, **kwargs)
    16.   File "/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/extractor.py", line 61, in download_by_url
    17.     self.download(**kwargs)
    18.   File "/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/extractor.py", line 241, in download
    19.     av=stream_id in self.dash_streams)
    20.   File "/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/common.py", line 1024, in download_urls
    21.     headers=headers, **kwargs
    22.   File "/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/common.py", line 649, in url_save
    23.     chunk_sizes = [url_size(url, faker=faker, headers=tmp_headers) for url in url]
    24.   File "/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/common.py", line 649, in <listcomp>
    25.     chunk_sizes = [url_size(url, faker=faker, headers=tmp_headers) for url in url]
    26.   File "/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/common.py", line 533, in url_size
    27.     response = urlopen_with_retry(request.Request(url, headers=headers))
    28.   File "/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/common.py", line 408, in urlopen_with_retry
    29.     return request.urlopen(*args, **kwargs)
    30.   File "/home/xiongz/anaconda3/lib/python3.6/urllib/request.py", line 223, in urlopen
    31.     return opener.open(url, data, timeout)
    32.   File "/home/xiongz/anaconda3/lib/python3.6/urllib/request.py", line 526, in open
    33.     response = self._open(req, data)
    34.   File "/home/xiongz/anaconda3/lib/python3.6/urllib/request.py", line 544, in _open
    35.     '_open', req)
    36.   File "/home/xiongz/anaconda3/lib/python3.6/urllib/request.py", line 504, in _call_chain
    37.     result = func(*args)
    38.   File "/home/xiongz/anaconda3/lib/python3.6/urllib/request.py", line 1361, in https_open
    39.     context=self._context, check_hostname=self._check_hostname)
    40.   File "/home/xiongz/anaconda3/lib/python3.6/urllib/request.py", line 1320, in do_open
    41.     raise URLError(err)
    42. urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:833)>

    解决：
    在/home/xiongz/anaconda3/lib/python3.6/site-packages/you_get/__main__.py里添加代码：

    1. import ssl
    2. ssl._create_default_https_context = ssl._create_unverified_context

    就ok了。

    python—urllib.error.URLError:certificate verify failed: unable to get local issuer certificat