Python scripts can be run on Android using the Scripting Layer For Android (SL4A) in combination with a Python interpreter for Android.

QPython is a script engine that runs Python scripts and projects on android devices. It contains the Python interpreter, console, editor, and the SL4A Library for Android. It offers a great development kit which lets you easily develop Python projects and scripts on your phone. If you know about some other good apps that allows to do. The source code for both the apps (Python file, APK, and buildozer spec) can be found at this GitHub repository. If you don’t want to use the APK generated into your devices then you simply host them online using a free service called Appetize.io which allows you to run android apps in browsers!

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SL4A
The SL4A project makes scripting on Android possible, it supports many programming languages including Python, Perl, Lua, BeanShell, JavaScript, JRuby and shell. The SL4A project has a lot of contributors from Google but it is not an official Google project.

Scripts can access Android specific features such as calling, text message (SMS), take picture, text to speech, bluetooth and many more.

In this article you will learn how to run Python on Android devices using SL4A.

Install SL4A

QR: Link to SL4A APK
First enable installation of programs from unknown sources. By default Android devices can only install apps from the Google Play Store.
You have to enable the permission ‘Install from Unknown Sources’, by going to Settings -> Security -> Unknown Sources and tap the box.
After you have have updated these settings donwload the SL4A APK. Visit https://github.com/kuri65536/sl4a on your Android device and download the SL4A APK (or use the QR code on the right).
Once downloaded an installation menu will popup, requesting all permissions on your Android device.
SL4A-Permissions

Install Python 3 for Android

QR Code Python 3 for Android
Install the Py4A app. The Python for Android app is built to run solely on
Android devices. You should use this app together with SL4A.
You can pick any version of Py4A, but bare in mind the supported version on Android:

• Python 2 requires Android Device >= 1.6


• Python 3 requires Android Device >= 2.3.1

The git repository is: https://github.com/kuri65536/python-for-android/releases
You could also use the QR code on the right using a QR scanner on your Android device.
Once Py4A is installed, start the app and press install. This will install the Python interpreter.
Android Python 3 Install

SL4A

Open SL4A again. Many scripts will appear (in a list). You can now run Python scripts on your Android Device!
Python-On-Android
Press on a program such as speak.py A little popup will be shown. Pressing on the terminal icon will start the Python script.
SL4A-Python-Menu
The third button (the pencil) will open an editor. This is not a full blown IDE but a simple editor.
It doesn’t have syntax highlighting.

Scripting on Android

You may prefer your favorite Python editor whatever it may be (vim/emacs fans here? PyCharm? Atom?)
All scripts are stored in /sl4a/scripts/

Python Runner Download

Python Runner For Android Free

A simple program (Spaceship Launch):

Python Runner File

More examples:
http://www.mattcutts.com/blog/android-barcode-scanner/
https://github.com/damonkohler/sl4a/blob/wiki/Tutorials.md