May 2017
Beginner to intermediate
220 pages
5h 2m
English
Content preview from Python Web Scraping - Second Edition
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Overview of Redis
Here is an example of how to save some example website data in Redis and then load it:
In [5]: url = 'http://example.webscraping.com/view/United-Kingdom-239' In [6]: html = '...'In [7]: results = {'html': html, 'code': 200}In [8]: r.set(url, results)Out[8]: TrueIn [9]: r.get(url)Out[9]: b"{'html': '...', 'code': 200}"
We can see with the get output, that we will receive bytes back from our Redis storage, even if we have inserted a dictionary, or a string. We can manage these serializations the same way we did for our DiskCache class, by using the json module.
What happens if we need to update the content of a URL?
In [10]: r.set(url, {'html': 'new html!', 'code': 200})Out[10]: TrueIn [11]: r.get(url)Out[11]: b"{'html': ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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