Pythonista script for recursive summatory of consecutive numbers

RUMA.py

import console

def tryInput(prompt=None):
	value = input(prompt)
	try:
		if int(value) <= 0:
			raise ValueError
		return int(value)
	except ValueError:
		print('Numbers should be integers, and here must be higher than Zero...')
		return None

console.clear()
print(''' (           *      *            
 )\ )      (  `   (  `    (      
(()/(   (  )\))(  )\))(   )\     
 /(_))  )\((_)()\((_)()((((_)(   
(_)) _ ((_|_()((_|_()((_)\ _ )\  
| _ \ | | |  \/  |  \/  (_)_\(_) 
|   / |_| | |\/| | |\/| |/ _ \   
|_|_\\\___/|_|  |_|_|  |_/_/ \_\  
                                 
Welcome Human,''')

start = None
end = None
while start == None :
	start = tryInput('Please tell me where to start: ')

while end == None:
	end = tryInput('And when should I stop?: ')

print('\nSo, the number you\'re looking for, while summing from ' + str(start) + ' to ' + str(end) + ', is... ' + str(sum(range(start, end+1))))