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May 13, 2021 / Last updated : May 13, 2021 admin Python Code

ffill_bfill

Forward Fill and Backward Fill Demo   year profit 0 2018 50.0 1 2019 100.0 2 2020 NaN 3 2021 0.0 Forward Fill (from row above)   year profit 0 2018 50.0 1 2019 100.0 2 2020 100.0 3 2021 0.0 Forward Fill (from previous (left) column )   year profit 0 2018.0 50.0 1 […]

May 12, 2021 / Last updated : March 10, 2023 admin Pandas

Data Analysis With Pandas

If you want to learn about Data Analysis with Pandas and Python and you’re not familiar with Kaggle, check it out! Time to read article : 5 mins TLDR; We show how to use idxmax and apply with Pandas Introduction Here we will look at some functions in Pandas which will help with ‘EDA’ – […]

May 8, 2021 / Last updated : February 16, 2023 admin ebay api

EBAY API – Python Code

If you have been looking for EBAY API – Python code then this article can help. Rather than use web scraping techniques you can access live EBAY listings via the API with an SDK for Python. Time to read this article about EBAY API – Python Code : 5 mins TLDR; Watch the ebay api […]

April 27, 2021 / Last updated : April 27, 2021 admin postgres

PostgreSQL

PostgreSQL is a free, powerful SQL database which is frequently used with Python How to connect to postgres sudo -i -u postgres run psql postgres@rag-laptop:~$ psql psql (12.6 (Ubuntu 12.6-0ubuntu0.20.04.1)) Type “help” for help. list databases postgres=# l List of databases Name | Owner | Encoding | Collate | Ctype | Access privileges ———–+———-+———-+————-+————-+———————– gis […]

April 26, 2021 / Last updated : February 27, 2023 admin Python Code

Extract links with Scrapy

Using Scrapy’s LinkExtractor method you can get the links from every page that you desire. What are Link Extractors? “A link extractor is an object that extracts links from responses.” Summary The above code gets all of the hrefs very quickly and give you the flexibility to omit or include very specific attirbutes Watch the video Extract Links | how to scrape website urls | Python + Scrapy […]

April 21, 2021 / Last updated : April 21, 2021 admin Python Code

Read Scrapy ‘start_urls’ from csv file

How can the start_urls for scrapy be imported from csv? Using a list comprehension and a csv file you can make Scrapy get specific URLs from a predefined list use the .strip() method to remove newline characters Here you can see the line.strip() is performing the removal: [line.strip() for line in file] Demonstration of how […]

April 16, 2021 / Last updated : April 16, 2021 admin Python Code

How to web scrape iframes with scrapy

Web Scraping pages with iframes in can be done with Scrapy if you use a separate URL to access the data inside the iframe. You need to identify the name of the page of the iframe and then append that to your base url to provide a 2nd URL for the Scrapy spider to visit. […]

April 9, 2021 / Last updated : February 13, 2023 admin Python Code

How to scrape iframes

If you are scraping a website with pop up messages asking you to agree to accept cookies. This can prevent your scraper from continuing to the pages you want to scrape. How do you get past these? Using Selenium you need to switch to the iframe (which you can identify using browser tools / inspect […]

March 12, 2021 / Last updated : March 12, 2021 admin Python Code

Comparing values in SQL against previously scraped data

If you have scraped data on more than one occasion and want to check if a value has changed in a column since the previous scrape you could use this: select col1, col2  from TABLENAME  group by col1, col2  having count(col2) <2 This will compare and check if a value for col2 has changed since the previous scrape Let’s put some real names […]

March 9, 2021 / Last updated : February 14, 2023 admin Python Code

Parsing Scraped Data with Pandas

Once you have some data you’ll need to find the relevant parts and use them for further analysis. Rather than use the proverbial Excel sheet you can write code to automate the task. Consider the following : The following code will match where the row contains “Djibouti” and return the value that is in the […]

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