A blog of Python-related topics and code.
The Duffing Oscillator
Posted by: christian on 15 May 2018
The previous blog post described the motion of a quartic oscillator: a particle moving in the potential $V(x) = \frac{1}{4}x^4 - \frac{1}{2}x^2$. In this case, the motion was always periodic (since the particle's energy is conserved).
A quartic oscillator
Posted by: christian on 10 May 2018
Scraping a Wikipedia table with Pandas
Posted by: christian on 25 Apr 2018
In my previous post I gave a short script for scraping a particular Wikipedia page for some string-based data in one table. Then the internet had some advice for me.
Use pandas.read_html they said. It will be easy, they said; everything will be handled for you, they said. Just clean, analyse and report.
Scraping a Wikipedia table with Beautiful Soup
Posted by: christian on 24 Apr 2018
The Beautiful Soup Python library is an excellent way to scrape web pages for their content. I recently wanted a reasonably accurate list of official (ISO 3166-1) two-letter codes for countries, but didn't want to pay CHF 38 for the official ISO document. The ISO 3166-1 alpha-2 contains this information in an HTML table which can be scraped quite easily as follows.
How old are the world's nuclear reactors?
Posted by: christian on 19 Apr 2018
Most of the world's currently-operational nuclear reactors were built in the 1970s and 80s and with an expected lifespan of 30–40 years are coming to the end of their predicted lifetime. Many will need to be decommissioned in the not-too-distant future.