Posts tagged: python

All posts with the tag "python"

275 posts latest post 2026-03-31
Publishing rhythm
Feb 2026 | 1 posts
💭 python script is not found None

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When setting up a new machine, vm, docker image you might be installing command line tools from places like pip. They will often put executables in your ~/.local/bin directory, but by default your shell is not looking in that directory for commands.

WARNING: The script dotenv is installed in '/home/falcon/.local/bin' which is not on PATH. Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.

To solve this you need to add that directory to your $PATH.

export PATH=$PATH:~/.local/bin

To make this change permanant add this line to your shell’s init script, which is likely something like ~/.bashrc or ~/.zshrc.

💭 URL Decoding query strings or form parameters in Python | URLD... www.urldecoder.io

In order to turn url encoded links back into links that I would find in the database of my thoughts project I need to urldecode them when they hit the api. When anything hits the api it must urlencode the links in order for them to be sent correctly as data and not get parsed as part of the url.

Here is a snippet of how I am using urlib.parse.unquote to un-encode encoded urls so that I can fetch posts from the database.

Python scandir ignores hidden directories

The next version of markata will be around a full second faster at building it’s docs, that’s a 30% bump in performance at the current state. This performance will come when virtual environments are stored in the same directory as the source code.

I was looking through my profiler for some unexpected performance hits, and noticed that the docs plugin was taking nearly a full second (sometimes more), just to run glob.

| |- 1.068 glob markata/plugins/docs.py:40 | | |- 0.838 <listcomp> markata/plugins/docs.py:82 | | | `- 0.817 PathSpec.match_file pathspec/pathspec.py:165 | | | [14 frames hidden] pathspec, <built-in>, <string>

Python scandir ignores hidden directories #

I started looking for different solutions and what I found was that I was hitting pathspec with way more files than I needed to.

len(list(Path().glob("**/*.py"))) # 6444 len([Path(f) for f in glob.glob("**/*.py", recursive=True)]) # 110

After digging into the docs I found that...

...

Pycon 2023

I don’t want to be an expert python developer.

https://www.youtube.com/watch?v=iKzOBWOHGFE

# Version 1 def newton(f, x0, fprime, maxiter=100): ... # Version 2 def newton(f, x0, fprime, tol=1e-6, maxiter=100): ... # 🔴 Broke in Version 2 newton(f, x0, fprime, 100)

In an alternate timeline the maintainer of newton could have chose to use keyword only arguments to prevent pain for users of libraries, or poor api design due to fear of changing api on users.

1 min read
python
Getting Started with Pydantic

global Field global BaseModel from pydantic import BaseModel from pydantic import Field

Pydantic is a Python library for serializing data into models that can be validated with a deep set of built in valitators or your own custom validators, and deserialize back to JSON or dictionary.

To install pydantic you will first need python and pip. Once you have pip installed you can install pydantic with pip.

pip install pydantic

Always install in a virtual environment

To get started with pydantic you will first need to create a Pydantic model. This is a python class that inherits from pydantic.BaseModel.

...

Pydantic and singledispatch

I was reading about pydantic-singledispatch from Giddeon’s blog and found it very intersting. I’m getting ready to implement pydantic on my static site generator markata, and I think there are so uses for this idea, so I want to try it out.

Let’s set up some pydantic settings. We will need separate Models for each environment that we want to support for this to work. The whole idea is to use functools.singledispatch and type hints to provide unique execution for each environment. We might want something like a path_prefix in prod for environments like GithubPages that deploy to /<name-of-repo> while keeping the root at / in dev.

...

2 min read
python
pipx textual devtools

I really like having global cli command installed with pipx. Since textual 0.2.x (the css release) is out I want to be able to pop into textual devtools easily from anywhere.

You can pipx install textual.

pipx install textual

But if you try to run any textual cli commands you will run into a ModuleNotFoundError, because you need to install the optional dev dependencies.

Traceback (most recent call last): File "/home/u_walkews/.local/bin/textual", line 5, in <module> from textual.cli.cli import run File "/home/u_walkews/.local/pipx/venvs/textual/lib/python3.10/site-packages/textual/cli/cli.py", line 4, in <module> import click ModuleNotFoundError: No module named 'click'

Pipx Inject #

In order to install optional dependencies with pipx you need to first install the library, then inject in the optional dependencies using the square bracket syntax.

textual app devtools

I am working through the textual tutorial, and I want to put it in a proper cli that I can pip install and run the command without textual run --dev app.py. This is a fine pattern, but I also want this to work when I don’t have a file to run.

I set up a new project running hatch new, and added the following entrypoint, giving me a tutorial cli command to run.

... [project.scripts] tutorial = 'textual_tutorial.tui:tui'

https://waylonwalker.com/hatch-new-cli/

If you are using setup.py, you can set up entrypoints in the setup command.

...

Markata GitHub Pages
11ty https://www.rockyourcode.com/how-to-deploy-eleventy-to-github-pages-with-github-actions/ hugo puts it in the base url https://gohugo.io/getting-started/configuration/#baseurl mkdocs uses a special cli build command https://squidfunk.github.io/mkdocs-material/publishing-your-site/#github-pages
Using Django Rest Framework inside react
npx create-react-app todoreact import React,{useState,useEffect} from 'react'; import './App.css'; function App() { const [data,setData]=useState([]); const [newName,setNewName]=useState([]); const getData=()=>{ fetch('/api' ,{ headers : { 'Content-Type': 'application/json', 'Accept': 'application/json' } } ) .then(function(response){ return response.json(); }) .then(function(myJson) { setData(myJson) }); } useEffect(()=>{ getData() },[]) const addItem= async () => { const rawResponse = await fetch('/api/add/', { method: 'POST', headers: { 'Accept': 'application/json', 'Content-Type': 'application/json' }, body: JSON.stringify({&#34;name&#34;: newName}) }); const content = await rawResponse; console.log(content); getData() } return ( <div className=&#34;App&#34;> { data && data.length>0 && data.map((item)=><p>{item.id}{item.priority}{item.name}<button>raise priority</button></p>) } <input type='text' value={newName} onChange={(e) => (setNewName(e.target.value))} /> <button onClick={addItem} >add item</button> </div> ); } export default App;
Getting Started with Django REST framework

In my adventure to learn django, I want to be able to setup REST api’s to feed into dynamic front end sites. Potentially sites running react under the hood.

To get started lets open up a todo app that I created with django-admin startproject todo.

pip install djangorestframework

Install APP #

Now we need to declare rest_framwork as an INSTALLED_APP.

INSTALLED_APPS = [ ... "rest_framework", ... ]

create the api app #

Next I will create all the files that I need to get the api running.

...