Lua vs python

P ytho n vs L ua

S K p la ne t
신호철

Script for making Applications

 Background
- The complexity of applications increased extremely.
- Applications need to be applied large-scale refactoring.

 What can the script do ?
- Can reduce code-size and increase maintainability.
- Make it easy to append new applications.
- When the middleware layer is modified, the modification doesn’t propagate to the
application layer.
It’s limited to the script-engine layer.

 Candidate script languages
- Lua, Python

What’s Lua

 Lua is Implemented and maintained by Tecgraf*1.

 Lua has used in many industrial applications
such as Adobe’s Photoshop Lightroom.

 Lua is the leading scripting language in games.

 Lua is Embedded in games ( e.g. World of Warcraft ) and Ginga*2.

: Tecgraf - http://www.tecgraf.puc-rio.br/
*1

: Ginga brasil – 브라질향 데이터방송 규격
*2

Why Lua

 Lua is small
- The source contains around 17,000 Lines of C.
- All standard libraries take just 144K Bytes.

 Lua is powerful
- Lua provides meta-mechanisms for implementing classes and inheritance.
- Lua provides garbage collection.

 Lua is fast
- Several benchmarks show Lua as the one of the fastest languages.

 Lua is portable & embeddable
- Lua is definitely easy to be embedded with small footprint.

 Lua is free : MIT License*1
: MIT License - http://ko.wikipedia.org/wiki/MIT_%EB%9D%BC%EC%9D%B4%EC%84%A0%EC%8A%A4
*1

Lua-Application Prototyping - 1/2

 We ported mobile Calculator into Lua

- We implemented UI Wrapper functions which are required in Calculator.
- GTK-related functions and Softkey functions.

- Calculator Logic is implemented by Lua script.
- Main functions which is needed in 4 fundamental rules of Arithmetic are ported now.

- The prototype of Lua-Calculator is successfully ported in our mobile platform.

Lua-Application Prototyping - 2/2

 GTK mapping
- Wrapper functions are implemented.
- makeWindow, makeButton, makeLabel,
setLabel, makeSoftkey.

 Calculator Logic
- 190 Lines of Lua code.

 Calculator UI
- 54 Lines of Lua code.

 Wrapper Code & Lua script

Main.c Calc.lua

What’s Python

 Released first by Guido van Rossum in 1991.

 Now managed by Python Software Foundation*1

 Embedded as a scripting language in these S/W products. *2
- GIMP, gedit, Vim, Maya etc
- In mobile domain, Python for s60*3

 Features a fully dynamic type, automatic memory management.

*1
: Python Software Foundation – Wikipedia, http://en.wikipedia.org/wiki/Python_Software_Foundation
*2
: Python-embedded S/W – Wikipedia, http://en.wikipedia.org/wiki/Python_software
*3
: Python for s60 – nokia.com http://wiki.opensource.nokia.com/projects/Python_for_S60

Why Python

 Highly Readable
- Python uses whitespace indentation to delimit statement blocks.

 Powerful Standard Library
- Python has a very large standard library.

 Powerful Glue Language
- Python has the ability to use a lower-level language such as C/C++.
- Python can easily attach new modules by using ctypes*1 or swig*2, etc.

 Free
- Python Software Foundation License*3
: Allows modifications to the source code and derivative works.
*1
: Ctypes – http://www.python.org/doc/2.5/lib/module-ctypes.html
*2
: Swig – http://www.swig.org
*3
: Python Software Foundation License – http://en.wikipedia.org/wiki/Python_Software_Foundation_License

Python-Application Prototyping : Calculator

 To wrap gtk layer, we try to use PyGTK*1.

 platform-dependent functions such as Softkeys
are not yet implemented by hand.

 Calculator UI : 114 Lines of python code
- Example UI code :
Y:funcalc.py

: PyGTK : GTK wrapper for python - http://www.pygtk.org/
*1

Lua vs Python

Lua Python
Binary size about 200KB About 2MB
(Lua version 5.1) (Python version 2.6)
Memory usage Lua is more compact
Speed Lua is faster*1
Multi-threading Thread-safe Poor-quality
Standard Library Small & compact Rich & powerful
Glue ability Easy Normal

*1
: see also Lua vs Python : CPU+Memory

What is the most suitable for mobile applications

 Lua is more compact and faster than Python. But Python is further
powerful.
- Python has lots of build-in modules and many open-source wrapper modules such as
pyGtk.

 In case of mobile application which has abundant resources,
Python is the most suitable for applications.

Lua vs Python : CPU+Memory

 CPU + Memory Usage + Lines of Code.

Lua vs python

Recommended

More Related Content

What's hot (19)

Viewers also liked (6)

Similar to Lua vs python (20)

Recently uploaded (20)

Lua vs python

Editor's Notes