Posts tagged: python

So many terminal applications bind q to exit, even the python debugger, its muscle memory for me. But to exit ipython I have to type out exit<ENTER>. This is fine, but since q is muscle memory for me I get this error a few times per day.

╭─────────────────────────────── Traceback (most recent call last) ────────────────────────────────╮ │ <ipython-input-1-2b66fd261ee5>:1 in <module> │ ╰──────────────────────────────────────────────────────────────────────────────────────────────────╯ NameError: name 'q' is not defined

After digging way too deep into how IPython implements its ExitAutoCall I realized there was a very simple solution here. IPython automatically imports all the scripts you put in your profile directory, all I needed was to create...

...

It’s no secret that I love automation, and lately my templating framework of choice has been copier. One hiccup I recently ran into was having spaces in my templated directory names. This makes it harder to run commands against as you need to escape them, and if they end up in a url you end up with ugly %20 all over.

Yes the solution comes from a competing templating framework.

I install copier with pipx, so I need to inject cookiecutter in to my copier environment to use the slugify filter.

pipx inject copier cookiecutter

If you are using a normal virtual environment you can just pip install it.

...

Textual has devtools in the upcoming css branch, and its pretty awesome!

Textual is still very early and not really ready for prime time, but it’s quite amazing how easy some things such as creating keybindings is. The docs are coming, but missing right now so if you want to use textual be ready for reading source code and examples.

As @willmcgugan shows in this tweet it’s pretty easy to setup, it requires having two terminals open, or using tmux, and currently you have to use the css branch.

https://twitter.com/willmcgugan/status/1531294412696956930

...

totally guessed at this post’s date

I’m still trying to understand this one, but this is how you force a python object to stop atexit.

Whenever you are installing python packages, you should always use a virtual environment. pip makes this easy to follow by adding some configuration to pip.

Pip is the pacakage tool for python. It installs third-party packages and is configurable. One of the configuration settings that I highly reccommend everyone to add is require-virtualenv. This will stop pip from installing any packages if you have not activated a virtualenv.

python packages often require many different dependencies, sometimes packages are up to date and sometimes they require different versions of dependencies. If you install everything in one environment its easy to end up with version conflict issues that are really hard to resolve, especially since your system environment cannot easily be restarted.

My one exception that I put in my system level packages is pipx. pipx is very handy as it manages virtual environments for you and is intended for command line utilities that would end up in your system env or require you to manually manage virtual environments without it.

...

I’ve been trying to adopt pyenv for a few months, but have been completely blocked by this issue on one of the main machines I use. Whenever I start up ipython I get the following error.

ImportError: No module named '_sqlite3

I talked about why and how to use pyenv along with my first impressions in this post

According to #678 I need to install libsqlite3-dev on ubuntu to resolve this issue.

libsqlite3-dev can be installed using apt

...

I really like the super clean look of no status menus, no url bar, no bookmarks bar, nothing. Don’t get me wrong these things are useful, but honestly they take up screen real estate and I RARELY look at them. What I really want is a toggle hotkey. I found this one from one of DT’s youtube video’s. I can now tap xx and both the status bar at the botton and the address bar at the top disappear.

When you first start qutebrowser It will create some config files in your home directory for you, but they will be empty.

As far as I know qutebrowser will create this default config out of the box for you, if it doesn’t, then somehow it just appeared for me 😁.

❯ tree ~/.config/qutebrowser /home/waylon/.config/qutebrowser ├── autoconfig.yml ├── bookmarks │   └── urls ├── config.py ├── greasemonkey └── quickmarks 2 directories, 5 files

Why convert #

You might want to confvert if you are more comfortable with the python config, or if like me you just want config in one place and you are stealing configuration options from others who have thiers in config.py.

I am getting ready to do some timeseries analysis on a git repo with python, my first step is to figure out a way to list all of the git commits so that I can analyze each one however I want. The GitPython library made this almost trivial once I realized how.

from git import Repo repo = Repo('.') commits = repo.iter_commits()

This returns a generator, if you are iterating over them this is likely what you want.

commits # <generator object Commit._iter_from_process_or_stream at 0x7f3307584510>

The generator will return git.Commit objects with lots of information about each commit such as hexsha, author, commited_datetime, gpgsig, and message.

GitPython is a python api for your git repos, it can be quite handy when you need to work with git from python.

I recently made myself a handy tool for making screenshots in python and it need to do a git commit and push from within the script. For this I reached for GitPython.

How I Quickly Capture Screenshots directly into My Blog

GitPython is a python library hosted on pypi that we will want to install into our virtual environments using...

...

Python, click install

Edit the System Environment Variables

Environment Variables button

Add the following path to your users Path Variable

Sometimes you just want python to do something else when you hit an exception, maybe that’s fire a text, slack message, email, or system notification like I wanted.

I am working on a quick and dirty python script designed to take screenshots and land them on my website in a single hotkey. With it being designed to run with a hotkey, if it were to error I would not see it.

I could have gone down a logging route, but honestly this is meant to be quick, dirty, and work on my system for me. I just want to get it in my system notification.

Python exposes sys.excepthook for just this case. Here is what I ended up doing to fire a system notification as well as printing the message. Yaya a log would be mroe appropriate, but this is designed to just get done quick and do the job I want it to do.

pygame events are stored in a queue, by default the most suggested way shown in all tutorials “pumps” the queue, which removes all the messages.

You don’t necessarily need a full boilerplate to start looking at events, you just just need to pygame.init() and to capture any keystrokes you need a window to capture them on, so you will need a display running.

import pygame pygame.init() pygame.display.set_mode((854, 480))

get some events #

Let’s use pygames normal event.get method to get events.

events = pygame.event.get()

printing the events reveal this

...

One of the most essential concepts of pygame to start making a game you will need to understand is loading images and blitting them to the screen.

blit stands for block image transfer, to me it feels a lot like layering up layers/images in photoshop or Gimp.

I started by making a spotlight in Gimp, by opening a 64x64 pixel image and painting the center with a very soft brush.

This is what it looks like

...

Dunk is a beautiful git diff tool built on top of rich.

Browsing through twitter the other day I discovered it through this tweet by _darrenburns.

https://twitter.com/_darrenburns/status/1510350016623394817

Before I dive in deep, I do want to mention that Dunk is super new and beta at this point. I am making it my default pager, because I know what I am doing and can quickly shift back...

...