Initial commit
add json, struct, vt100 control-code
test git staged file
modify README.md
modify README.md second time
add multiprocessing and subprocess
add ElementTree
add optparse
add socket
remove socket/.server.py.swp
add import
add __new__, singleton
add more singleton method
singlton
add Descriptor
learn more about descriptor
add property()
add set, decorator, iterator
add __metaclass__ usage
use __metaclass__ to create singleton