A blog of Python-related topics and code.
A circle problem
Posted by: christian in Featured on frontpage on 30 Sep 2023
A recent tweet by @iwontoffendyou posed the following problem: with reference to the figure below, what is the radius of the orange circle, which is tangent to the $y$-axis, the unit circle and the curve $y = \sqrt{x}$?
The Square Roots of Integers Visualized as Sharks Teeth
Posted by: christian on 27 Sep 2023
The Spiral of Theodorus (also known as the Snail of Pythogoras), illustrated below, is a well-known visualization of the square roots of the integers as the length of the hypotenuses of a sequence of right triangles, placed edge-to-edge.
Cool DOIs in Python
Posted by: christian on 12 Sep 2023
A DOI (digital object identifier) is a persistent identifier used to uniquely identify various objects (usually documents or data sets). DOIs are typically presented as a link consisting of a proxy, a prefix and a suffix: for example:
Dyck paths and Catalan numbers
Posted by: christian on 8 Aug 2023
A Dyck path can be described as a sequence of $n$ horizontal steps for which, at each step a vertical step of $+1$ or $-1$ is taken subject to the constraints that the vertical coordinate never decreases below its initial value and the number of "up" and "down" steps is equal. For example,
A QR code generator in Django
Posted by: christian on 30 Jul 2023
The following code is the views.py file for the make_qr app behind this QR code generator app. The qrcode Python package generates a Pillow Image object, which is encoded in base-64 for rendering in the template, saving the need for an intermediate PNG file.