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Archive for January, 2016

getting started with Kivy

January 24, 2016 Leave a comment

Intro
Kivy is an open source library for developing multi-touch applications. It is cross-platform (Linux/OSX/Windows/Android/iOS) and released under the terms of the MIT License.

It comes with native support for many multi-touch input devices, a growing library of multi-touch aware widgets and hardware accelerated OpenGL drawing. Kivy is designed to let you focus on building custom and highly interactive applications as quickly and easily as possible.” (source)

Problem
How to install it in a virtual environment? I could install it but when I wanted to create a basic app, it dropped some error messages (“pygame or sdl missing”).

Solution
Instead of Pygame I chose the SDL way. So under Manjaro I had to install globally the following packages:

sudo pacman -S gstreamer sdl2_ttf sdl2_mixer sdl2_image

Maybe gstreamer is not necessary, I’m not sure.

I suggest working with Kivy in a Python 2 virtual environment. Why? If you want to build your app for Android, then you can use the buildozer tool. However, at the moment it doesn’t support Python 3 :( I’m sure it’ll change but at the moment stick with Python 2.

Then, in your virtual environment, install these:

pip install cython
pip install kivy

Let’s try if it works. Activate your virt. env. and launch the Python interpreter in it. Then try this code:

>>> from kivy.app import App
>>> App().run()

If you get a blank window with black background, then everything is fine.

Links

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find out a github user’s (hidden) email address

January 11, 2016 Leave a comment

Problem
You want to contact someone on GitHub but (s)he doesn’t indicate his/her email on the profile page. What to do?

Solution
Figure it out :) The manual steps are indicated here. I made a Python script of it that can be found here: https://github.com/jabbalaci/Bash-Utils/blob/master/github_user_email.py .

Usage example:

$ ./github_user_email.py 
Github info (username or repo. link): https://github.com/jabbalaci/Bash-Utils                                 
jabba.laci@gmail.com

If you want to hide your email address, then here are some tips.

Categories: python Tags: ,

differences between Python 2 and Python 3 with examples

January 7, 2016 Leave a comment
Categories: python Tags: ,

Pew: A tool to manage multiple virtual environments written in pure Python

January 4, 2016 Leave a comment

Problem
You are fed up with virtualenv and virtualenvwrapper.

Solution
Use Pew, which is a new kid on the block. I collected my notes about it here, where I also provide two convenience scripts. I don’t want to copy all that here, so check out the GitHub link.