Questions about rtcwake

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I was looking for a way to wake up my computer automatically at a fixed time every day, and I found this script (I called it test.py and made it executable):
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#!/usr/bin/env python3
import datetime
import subprocess
###############################################
# set wakeuptime and the command
hour = 20
minutes = 0
command = "echo Hello"
###############################################
currtime = str(datetime.datetime.now().time()).split(":")[:2]
minutes_set = hour*60 + minutes
minutes_curr = int(currtime[0])*60 + int(currtime[1])
if minutes_curr < minutes_set:
minutes_togo = minutes_set - minutes_curr
else:
minutes_togo = minutes_set + 1440 - minutes_curr
interval = minutes_togo*60

run = "rtcwake -m no -s "+str(interval)+" && "+"sleep 60 &&"+command
subprocess.call(['/bin/bash', '-c', run])
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To run this script, I use: sudo ~/test.py
I have 2 questions:

1) What should I add to the script to make it call itself ?
(It would then fall in the second branch of the "if" statement and run again the next day)

2) Would it still execute if the computer is restarted before the next run of the script ?
If not, I will try using the startup. Will it accept sudo ? gksu ? what else ?

PS: The command I am interested in is not really echo.