Save results to csv/excel file

>>> from scrapex import Scraper
>>> from collections import OrderedDict
>>>
>>> s = Scraper(use_cache=True)
>>> doc = s.load('https://github.com/search?q=scraping+framework')
>>> nodes = doc.query("//ul[@class='repo-list']/li")
>>> print('num of nodes:', len(nodes))
num of nodes: 10
>>>
>>> for node in nodes:
...     item = OrderedDict()
...     item['name'] = node.extract(".//div[contains(@class,'text-normal')]/a")
...     item['description'] = node.extract(".//div[@class='mt-n1']/p").strip()
...     item['tags'] = node.query(".//a[contains(@class,'topic-tag')]").join(', ')
...
...     s.save(item, 'results.csv')
...     s.save(item, 'other_file.xlsx') #save this same item to another file
...
>>>