alpha-filter 0.9.2

differential filter

and greater

alpha-filter

When parsing, sometimes it is necessary to reduce the number of requests to the server, for example, our script collects links from pagination to the product every day, and then parses each product separately. But what to do if some time ago we already parsed these goods, why do it twice. alpha-filter will help filter out those ads that have already been read, and will return only new ones.

Getting starting

pip install alpha-filter

Usage

from alphafilter import filter_ads, mark_as_processed, is_processed

>>> first_parsing_urls = ["https://www.example.com/1", "https://www.example.com/2"]
>>> new, old = filter_ads(first_parsing_urls)
>>> new
["https://www.example.com/1", "https://www.example.com/2"]
>>> old
[]

second_parsing_urls = first_parsing_urls # second parsing same with first

>>> new, old = filter_ads(second_parsing_urls)
>>> new
[]
>>> old
[]

>>>third_parsing_urls = ["https://www.example.com/2", "https://www.example.com/3"]

>>> new, old = filter_ads(third_parsing_urls)
>>> new
["https://www.example.com/3"]
>>> old
["https://www.example.com/1"]

Also you can mark your urls for some purposes

>>> urls_for_mark = ["https://www.example.com/2", "https://www.example.com/3"]
>>> mark_as_processed(urls_for_mark)
>>> is_processed("https://www.example.com/2")
True
>>> is_processed("https://www.example.com/4")
False

It uses a fast sqlite database to store urls. The database file ('ads.db') will be created in the root directory

Warning!!! this package has no protection against sql injection, do not use it for the external interface