You can do it in the command line as follows:
schtasks /Create /SC HOURLY /TN PythonTask /TR "PATH_TO_PYTHON_EXE PATH_TO_PYTHON_SCRIPT"
That will create an hourly task called ‘PythonTask’. You can replace HOURLY with DAILY, WEEKLY etc.
PATH_TO_PYTHON_EXE will be something like: C:\python25\python.exe. Check out more examples by writing this in the command line:
schtasks /?
Otherwise you can open the Task Scheduler and do it through the GUI.
Hope this helps.