chain.py

from itertools import chain

for i in chain([0,1,2,3], range(4,11), 'ABC'):
    print(i, end = ' ')
#OUTPUT
'''
0 1 2 3 4 5 6 7 8 9 10 A B C
'''
my_iterable = [[0,1,2],[3,4],[5,6,7,8,9,10],['ABC']]
for i in chain.from_iterable(my_iterable):
    print(i, end = ' ')
#OUTPUT
'''
0 1 2 3 4 5 6 7 8 9 10 ABC
'''