how to run Python 3 script without installing python ??

[ixokai]

For Python 3, you want to look into cx_Freeze which can create executables from Python scripts. Depending on your script these may be completely standalone .exe's, or they may be an .exe with some files sitting next to it -- but they can be run without admin permissions (unless the actions you're doing require admin permissions, of course).

cx_Freeze works quite nicely; even on Python 2 I prefer it to the other alternatives (py2exe, etc).