Lua vs python

Lua vs python

• 1.
  P ytho nvs L ua S K p la ne t 신호철
• 2.
  Background
• 3.
  Script for makingApplications  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
• 4.
  Lua porting
• 5.
  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
• 6.
  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
• 7.
  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.
• 8.
  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
• 9.
  Python porting
• 10.
  What’s Python  Releasedfirst 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
• 11.
  Why Python  HighlyReadable - 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
• 12.
  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
• 13.
  Lua vs Python
• 14.
  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
• 15.
  What is themost 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.
• 16.
  Appendix
• 17.
  Lua vs Python: CPU+Memory  CPU + Memory Usage + Lines of Code.