正確的：

def parse(self, url, content):
? ? print 'parse'
? ? if url is None or content is None:
? ? ? ? return
? ? soup = BeautifulSoup(content, 'html.parser', from_encoding = 'utf-8')

? ? new_data = self._get_new_data(url, soup)
? ? new_urls = self._get_new_urls(url, soup)

? ? return ?new_urls, new_data

錯(cuò)誤的：

def parse(self, url, content):
? ? print 'parse'
? ? if url is None or content is None:
? ? ? ? return
? ? soup = BeautifulSoup(content, 'html.parser', from_encoding = 'utf-8')

? ? new_data = self._get_new_data(url, soup)
? ? new_urls = self._get_new_urls(url, soup)

? ? return ?new_data, new_urls

在試驗(yàn)過程中，發(fā)現(xiàn)錯(cuò)誤是最后的return順序弄反導(dǎo)致的，導(dǎo)致的錯(cuò)誤代碼是：

TypeError: 'set' object has no attribute '__getitem__'

用的pycharm 4.5.3，python 2.7.12.

謝謝老師~~