.msi installers are presented on the Python website: http://www.python.org/download/
Basic silent install example: python-3.3.3.msi /qn ALLUSERS=1
Silent install, specify install dir: python-3.3.3.msi /qn ALLUSERS=1 TARGETDIR="%PROGRAMFILES%\Python"
TARGETDIR= (sets the root installation directory. Default is [ROOT]\Python[Version]. Example: C:\Python33)
ALLUSERS=1 (Installs for all users. Default seems to be 0 when run from command line. I would suggest always explicitly setting this property.)
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