May 2017
Beginner to intermediate
220 pages
5h 2m
English
Content preview from Python Web Scraping - Second Edition
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Drawbacks of DiskCache
Our disk-based caching system was relatively simple to implement, does not depend on installing additional modules, and the results are viewable in our file manager. However, it has the drawback of depending on the limitations of the local filesystem. Earlier in this chapter, we applied various restrictions to map URLs to safe filenames, but an unfortunate consequence of this system is that some URLs will map to the same filename. For example, replacing unsupported characters in the following URLs will map them all to the same filename:
- http://example.com/?a+b
- http://example.com/?a*b
- http://example.com/?a=b
- http://example.com/?a!b
This means that, if one of these URLs were cached, it would look like the other three ...
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