def parse(self, response):
    alphabets_urls = response.xpath('//a[contains(.,"alphabet")]')
    (yield from response.follow_all(alphabets_urls, callback=self.parse_alphabet))
def parse(self, response):
    alphabets_urls = response.xpath('//a[contains(.,"alphabet")]')
    (yield from response.follow_all(alphabets_urls, callback=self.parse_alphabet))