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# 두 스트링 'ABCD', 'xy' 의 곱집합은 Ax Ay Bx By Cx Cy Dx Dy 입니다.
# https://realpython.com/python-itertools/
import numpy as np
import operator
from functools import reduce
import itertools
iterable1 = 'ABCD'
iterable2 = 'xy'
iterable3 = '1234'
itertools.product(iterable1, iterable2, iterable3)
# 2차원 리스트를 1차원 리스트로 만들기
my_list = [[1, 2], [3, 4], [5, 6]]
# 방법 1 - sum 함수
answer = sum(my_list, [])
# 방법4 - list comprehension 이용
[element for array in my_list for element in array]
###########
# itertools 사용
# 방법 2 - itertools.chain
list(itertools.chain.from_iterable(my_list))
# 방법 3 - itertools와 unpacking
list(itertools.chain(*my_list))
##################
# reduce 함수 이용 1
list(reduce(lambda x, y: x+y, my_list))
# reduce 함수 이용2
list(reduce(operator.add, my_list))
np.array(my_list).flatten().tolist()

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