from random import randint

import random

import string

def _gen(size=6, chars=string.ascii_uppercase + string.digits):

return ''.join(random.choice(chars) for _ in range(size))

def _genATstring():

length = randint(1,6)

stringa = "AT" + _gen(length) + '\r'

return stringa

def _genNumber():

if randint(0,1) == 0:

return "0" + str(randint(0,999))

else:

return randint(0,99999)

def _getRandomData():

length = randint(1,20)

return _gen(length, string.printable)

def generator():

index = _gen(1,"12312")

# 40% of probability

if index == "1":

result = _genATstring()

# 40% of probability

elif index == "2":

result = _genNumber()

# 20% of probability

else:

result = _getRandomData()

return str(result)