解决 ValueError: Missing scheme in request url: h

start_url 应该是应该列表,不能是元组!

2018-06-11 16:01:13 [scrapy.core.engine] INFO: Spider opened
2018-06-11 16:01:13 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2018-06-11 16:01:13 [scrapy.extensions.telnet] DEBUG: Telnet console listening on 127.0.0.1:6023
2018-06-11 16:01:13 [scrapy.core.engine] ERROR: Error while obtaining start requests
Traceback (most recent call last):
  File "D:\PyProject\venv\lib\site-packages\scrapy\core\engine.py", line 127, in _next_request
    request = next(slot.start_requests)
  File "D:\PyProject\venv\lib\site-packages\scrapy\spiders\__init__.py", line 83, in start_requests
    yield Request(url, dont_filter=True)
  File "D:\PyProject\venv\lib\site-packages\scrapy\http\request\__init__.py", line 25, in __init__
    self._set_url(url)
  File "D:\PyProject\venv\lib\site-packages\scrapy\http\request\__init__.py", line 62, in _set_url
    raise ValueError('Missing scheme in request url: %s' % self._url)
ValueError: Missing scheme in request url: h

2018-06-11 16:01:13 [scrapy.core.engine] INFO: Closing spider (finished)