Itertools, Chain, Multiple Ranges, and Lists in Sequence

# if you want to iterate over multiple ranges/lists in sequence:

for i in range(0, 180, 45):
    print(i)
for i in range(180, 0, -45):
    print(i)
for i in [0]:
    print(i)


# use the "chain" function from itertools to combine the ranges/lists:

from itertools import chain

for i in chain( range(0, 180, 45), range(180, 0, -45), [0] ):
    print(i)