待填坑

Posted 2020-11-27 miaoweiye

今天看见一个烧脑的代码，一时没看懂结果，刨个坑，看懂填

def product(*args, repeat=1):
    pools = [tuple(pool) for pool in args] * repeat
    result = [[]]
    for pool in pools:
        result = [x+[y] for x in result for y in pool]
    for prod in result:
        yield tuple(prod)

rtn = product(‘xyz‘, ‘12‘, repeat=3)
print(list(rtn))


#result:

[(‘x‘, ‘1‘, ‘x‘, ‘1‘, ‘x‘, ‘1‘), (‘x‘, ‘1‘, ‘x‘, ‘1‘, ‘x‘, ‘2‘), (‘x‘, ‘1‘, ‘x‘, ‘1‘, ‘y‘, ‘1‘), (‘x‘, ‘1‘, ‘x‘, ‘1‘, ‘y‘, ‘2‘), (‘x‘, ‘1‘, ‘x‘, ‘1‘, ‘z‘, ‘1‘), (‘x‘, ‘1‘, ‘x‘, ‘1‘, ‘z‘, ‘2‘), (‘x‘, ‘1‘, ‘x‘, ‘2‘, ‘x‘, ‘1‘), (‘x‘, ‘1‘, ‘x‘, ‘2‘, ‘x‘, ‘2‘), (‘x‘, ‘1‘, ‘x‘, ‘2‘, ‘y‘, ‘1‘), (‘x‘, ‘1‘, ‘x‘, ‘2‘, ‘y‘, ‘2‘), (‘x‘, ‘1‘, ‘x‘, ‘2‘, ‘z‘, ‘1‘), (‘x‘, ‘1‘, ‘x‘, ‘2‘, ‘z‘, ‘2‘), (‘x‘, ‘1‘, ‘y‘, ‘1‘, ‘x‘, ‘1‘), (‘x‘, ‘1‘, ‘y‘, ‘1‘, ‘x‘, ‘2‘), (‘x‘, ‘1‘, ‘y‘, ‘1‘, ‘y‘, ‘1‘), (‘x‘, ‘1‘, ‘y‘, ‘1‘, ‘y‘, ‘2‘), (‘x‘, ‘1‘, ‘y‘, ‘1‘, ‘z‘, ‘1‘), (‘x‘, ‘1‘, ‘y‘, ‘1‘, ‘z‘, ‘2‘), (‘x‘, ‘1‘, ‘y‘, ‘2‘, ‘x‘, ‘1‘), (‘x‘, ‘1‘, ‘y‘, ‘2‘, ‘x‘, ‘2‘), (‘x‘, ‘1‘, ‘y‘, ‘2‘, ‘y‘, ‘1‘), (‘x‘, ‘1‘, ‘y‘, ‘2‘, ‘y‘, ‘2‘), (‘x‘, ‘1‘, ‘y‘, ‘2‘, ‘z‘, ‘1‘), (‘x‘, ‘1‘, ‘y‘, ‘2‘, ‘z‘, ‘2‘), (‘x‘, ‘1‘, ‘z‘, ‘1‘, ‘x‘, ‘1‘), (‘x‘, ‘1‘, ‘z‘, ‘1‘, ‘x‘, ‘2‘), (‘x‘, ‘1‘, ‘z‘, ‘1‘, ‘y‘, ‘1‘), (‘x‘, ‘1‘, ‘z‘, ‘1‘, ‘y‘, ‘2‘), (‘x‘, ‘1‘, ‘z‘, ‘1‘, ‘z‘, ‘1‘), (‘x‘, ‘1‘, ‘z‘, ‘1‘, ‘z‘, ‘2‘), (‘x‘, ‘1‘, ‘z‘, ‘2‘, ‘x‘, ‘1‘), (‘x‘, ‘1‘, ‘z‘, ‘2‘, ‘x‘, ‘2‘), (‘x‘, ‘1‘, ‘z‘, ‘2‘, ‘y‘, ‘1‘), (‘x‘, ‘1‘, ‘z‘, ‘2‘, ‘y‘, ‘2‘), (‘x‘, ‘1‘, ‘z‘, ‘2‘, ‘z‘, ‘1‘), (‘x‘, ‘1‘, ‘z‘, ‘2‘, ‘z‘, ‘2‘), (‘x‘, ‘2‘, ‘x‘, ‘1‘, ‘x‘, ‘1‘), (‘x‘, ‘2‘, ‘x‘, ‘1‘, ‘x‘, ‘2‘), (‘x‘, ‘2‘, ‘x‘, ‘1‘, ‘y‘, ‘1‘), (‘x‘, ‘2‘, ‘x‘, ‘1‘, ‘y‘, ‘2‘), (‘x‘, ‘2‘, ‘x‘, ‘1‘, ‘z‘, ‘1‘), (‘x‘, ‘2‘, ‘x‘, ‘1‘, ‘z‘, ‘2‘), (‘x‘, ‘2‘, ‘x‘, ‘2‘, ‘x‘, ‘1‘), (‘x‘, ‘2‘, ‘x‘, ‘2‘, ‘x‘, ‘2‘), (‘x‘, ‘2‘, ‘x‘, ‘2‘, ‘y‘, ‘1‘), (‘x‘, ‘2‘, ‘x‘, ‘2‘, ‘y‘, ‘2‘), (‘x‘, ‘2‘, ‘x‘, ‘2‘, ‘z‘, ‘1‘), (‘x‘, ‘2‘, ‘x‘, ‘2‘, ‘z‘, ‘2‘), (‘x‘, ‘2‘, ‘y‘, ‘1‘, ‘x‘, ‘1‘), (‘x‘, ‘2‘, ‘y‘, ‘1‘, ‘x‘, ‘2‘), (‘x‘, ‘2‘, ‘y‘, ‘1‘, ‘y‘, ‘1‘), (‘x‘, ‘2‘, ‘y‘, ‘1‘, ‘y‘, ‘2‘), (‘x‘, ‘2‘, ‘y‘, ‘1‘, ‘z‘, ‘1‘), (‘x‘, ‘2‘, ‘y‘, ‘1‘, ‘z‘, ‘2‘), (‘x‘, ‘2‘, ‘y‘, ‘2‘, ‘x‘, ‘1‘), (‘x‘, ‘2‘, ‘y‘, ‘2‘, ‘x‘, ‘2‘), (‘x‘, ‘2‘, ‘y‘, ‘2‘, ‘y‘, ‘1‘), (‘x‘, ‘2‘, ‘y‘, ‘2‘, ‘y‘, ‘2‘), (‘x‘, ‘2‘, ‘y‘, ‘2‘, ‘z‘, ‘1‘), (‘x‘, ‘2‘, ‘y‘, ‘2‘, ‘z‘, ‘2‘), (‘x‘, ‘2‘, ‘z‘, ‘1‘, ‘x‘, ‘1‘), (‘x‘, ‘2‘, ‘z‘, ‘1‘, ‘x‘, ‘2‘), (‘x‘, ‘2‘, ‘z‘, ‘1‘, ‘y‘, ‘1‘), (‘x‘, ‘2‘, ‘z‘, ‘1‘, ‘y‘, ‘2‘), (‘x‘, ‘2‘, ‘z‘, ‘1‘, ‘z‘, ‘1‘), (‘x‘, ‘2‘, ‘z‘, ‘1‘, ‘z‘, ‘2‘), (‘x‘, ‘2‘, ‘z‘, ‘2‘, ‘x‘, ‘1‘), (‘x‘, ‘2‘, ‘z‘, ‘2‘, ‘x‘, ‘2‘), (‘x‘, ‘2‘, ‘z‘, ‘2‘, ‘y‘, ‘1‘), (‘x‘, ‘2‘, ‘z‘, ‘2‘, ‘y‘, ‘2‘), (‘x‘, ‘2‘, ‘z‘, ‘2‘, ‘z‘, ‘1‘), (‘x‘, ‘2‘, ‘z‘, ‘2‘, ‘z‘, ‘2‘), (‘y‘, ‘1‘, ‘x‘, ‘1‘, ‘x‘, ‘1‘), (‘y‘, ‘1‘, ‘x‘, ‘1‘, ‘x‘, ‘2‘), (‘y‘, ‘1‘, ‘x‘, ‘1‘, ‘y‘, ‘1‘), (‘y‘, ‘1‘, ‘x‘, ‘1‘, ‘y‘, ‘2‘), (‘y‘, ‘1‘, ‘x‘, ‘1‘, ‘z‘, ‘1‘), (‘y‘, ‘1‘, ‘x‘, ‘1‘, ‘z‘, ‘2‘), (‘y‘, ‘1‘, ‘x‘, ‘2‘, ‘x‘, ‘1‘), (‘y‘, ‘1‘, ‘x‘, ‘2‘, ‘x‘, ‘2‘), (‘y‘, ‘1‘, ‘x‘, ‘2‘, ‘y‘, ‘1‘), (‘y‘, ‘1‘, ‘x‘, ‘2‘, ‘y‘, ‘2‘), (‘y‘, ‘1‘, ‘x‘, ‘2‘, ‘z‘, ‘1‘), (‘y‘, ‘1‘, ‘x‘, ‘2‘, ‘z‘, ‘2‘), (‘y‘, ‘1‘, ‘y‘, ‘1‘, ‘x‘, ‘1‘), (‘y‘, ‘1‘, ‘y‘, ‘1‘, ‘x‘, ‘2‘), (‘y‘, ‘1‘, ‘y‘, ‘1‘, ‘y‘, ‘1‘), (‘y‘, ‘1‘, ‘y‘, ‘1‘, ‘y‘, ‘2‘), (‘y‘, ‘1‘, ‘y‘, ‘1‘, ‘z‘, ‘1‘), (‘y‘, ‘1‘, ‘y‘, ‘1‘, ‘z‘, ‘2‘), (‘y‘, ‘1‘, ‘y‘, ‘2‘, ‘x‘, ‘1‘), (‘y‘, ‘1‘, ‘y‘, ‘2‘, ‘x‘, ‘2‘), (‘y‘, ‘1‘, ‘y‘, ‘2‘, ‘y‘, ‘1‘), (‘y‘, ‘1‘, ‘y‘, ‘2‘, ‘y‘, ‘2‘), (‘y‘, ‘1‘, ‘y‘, ‘2‘, ‘z‘, ‘1‘), (‘y‘, ‘1‘, ‘y‘, ‘2‘, ‘z‘, ‘2‘), (‘y‘, ‘1‘, ‘z‘, ‘1‘, ‘x‘, ‘1‘), (‘y‘, ‘1‘, ‘z‘, ‘1‘, ‘x‘, ‘2‘), (‘y‘, ‘1‘, ‘z‘, ‘1‘, ‘y‘, ‘1‘), (‘y‘, ‘1‘, ‘z‘, ‘1‘, ‘y‘, ‘2‘), (‘y‘, ‘1‘, ‘z‘, ‘1‘, ‘z‘, ‘1‘), (‘y‘, ‘1‘, ‘z‘, ‘1‘, ‘z‘, ‘2‘), (‘y‘, ‘1‘, ‘z‘, ‘2‘, ‘x‘, ‘1‘), (‘y‘, ‘1‘, ‘z‘, ‘2‘, ‘x‘, ‘2‘), (‘y‘, ‘1‘, ‘z‘, ‘2‘, ‘y‘, ‘1‘), (‘y‘, ‘1‘, ‘z‘, ‘2‘, ‘y‘, ‘2‘), (‘y‘, ‘1‘, ‘z‘, ‘2‘, ‘z‘, ‘1‘), (‘y‘, ‘1‘, ‘z‘, ‘2‘, ‘z‘, ‘2‘), (‘y‘, ‘2‘, ‘x‘, ‘1‘, ‘x‘, ‘1‘), (‘y‘, ‘2‘, ‘x‘, ‘1‘, ‘x‘, ‘2‘), (‘y‘, ‘2‘, ‘x‘, ‘1‘, ‘y‘, ‘1‘), (‘y‘, ‘2‘, ‘x‘, ‘1‘, ‘y‘, ‘2‘), (‘y‘, ‘2‘, ‘x‘, ‘1‘, ‘z‘, ‘1‘), (‘y‘, ‘2‘, ‘x‘, ‘1‘, ‘z‘, ‘2‘), (‘y‘, ‘2‘, ‘x‘, ‘2‘, ‘x‘, ‘1‘), (‘y‘, ‘2‘, ‘x‘, ‘2‘, ‘x‘, ‘2‘), (‘y‘, ‘2‘, ‘x‘, ‘2‘, ‘y‘, ‘1‘), (‘y‘, ‘2‘, ‘x‘, ‘2‘, ‘y‘, ‘2‘), (‘y‘, ‘2‘, ‘x‘, ‘2‘, ‘z‘, ‘1‘), (‘y‘, ‘2‘, ‘x‘, ‘2‘, ‘z‘, ‘2‘), (‘y‘, ‘2‘, ‘y‘, ‘1‘, ‘x‘, ‘1‘), (‘y‘, ‘2‘, ‘y‘, ‘1‘, ‘x‘, ‘2‘), (‘y‘, ‘2‘, ‘y‘, ‘1‘, ‘y‘, ‘1‘), (‘y‘, ‘2‘, ‘y‘, ‘1‘, ‘y‘, ‘2‘), (‘y‘, ‘2‘, ‘y‘, ‘1‘, ‘z‘, ‘1‘), (‘y‘, ‘2‘, ‘y‘, ‘1‘, ‘z‘, ‘2‘), (‘y‘, ‘2‘, ‘y‘, ‘2‘, ‘x‘, ‘1‘), (‘y‘, ‘2‘, ‘y‘, ‘2‘, ‘x‘, ‘2‘), (‘y‘, ‘2‘, ‘y‘, ‘2‘, ‘y‘, ‘1‘), (‘y‘, ‘2‘, ‘y‘, ‘2‘, ‘y‘, ‘2‘), (‘y‘, ‘2‘, ‘y‘, ‘2‘, ‘z‘, ‘1‘), (‘y‘, ‘2‘, ‘y‘, ‘2‘, ‘z‘, ‘2‘), (‘y‘, ‘2‘, ‘z‘, ‘1‘, ‘x‘, ‘1‘), (‘y‘, ‘2‘, ‘z‘, ‘1‘, ‘x‘, ‘2‘), (‘y‘, ‘2‘, ‘z‘, ‘1‘, ‘y‘, ‘1‘), (‘y‘, ‘2‘, ‘z‘, ‘1‘, ‘y‘, ‘2‘), (‘y‘, ‘2‘, ‘z‘, ‘1‘, ‘z‘, ‘1‘), (‘y‘, ‘2‘, ‘z‘, ‘1‘, ‘z‘, ‘2‘), (‘y‘, ‘2‘, ‘z‘, ‘2‘, ‘x‘, ‘1‘), (‘y‘, ‘2‘, ‘z‘, ‘2‘, ‘x‘, ‘2‘), (‘y‘, ‘2‘, ‘z‘, ‘2‘, ‘y‘, ‘1‘), (‘y‘, ‘2‘, ‘z‘, ‘2‘, ‘y‘, ‘2‘), (‘y‘, ‘2‘, ‘z‘, ‘2‘, ‘z‘, ‘1‘), (‘y‘, ‘2‘, ‘z‘, ‘2‘, ‘z‘, ‘2‘), (‘z‘, ‘1‘, ‘x‘, ‘1‘, ‘x‘, ‘1‘), (‘z‘, ‘1‘, ‘x‘, ‘1‘, ‘x‘, ‘2‘), (‘z‘, ‘1‘, ‘x‘, ‘1‘, ‘y‘, ‘1‘), (‘z‘, ‘1‘, ‘x‘, ‘1‘, ‘y‘, ‘2‘), (‘z‘, ‘1‘, ‘x‘, ‘1‘, ‘z‘, ‘1‘), (‘z‘, ‘1‘, ‘x‘, ‘1‘, ‘z‘, ‘2‘), (‘z‘, ‘1‘, ‘x‘, ‘2‘, ‘x‘, ‘1‘), (‘z‘, ‘1‘, ‘x‘, ‘2‘, ‘x‘, ‘2‘), (‘z‘, ‘1‘, ‘x‘, ‘2‘, ‘y‘, ‘1‘), (‘z‘, ‘1‘, ‘x‘, ‘2‘, ‘y‘, ‘2‘), (‘z‘, ‘1‘, ‘x‘, ‘2‘, ‘z‘, ‘1‘), (‘z‘, ‘1‘, ‘x‘, ‘2‘, ‘z‘, 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##############################################################33

pools=[(‘x‘, ‘y‘, ‘z‘), (‘1‘, ‘2‘), (‘x‘, ‘y‘, ‘z‘), (‘1‘, ‘2‘), (‘x‘, ‘y‘, ‘z‘), (‘1‘, ‘2‘)]

result=

[[‘x‘, ‘1‘, ‘x‘, ‘1‘, ‘x‘, ‘1‘], [‘x‘, ‘1‘, ‘x‘, ‘1‘, ‘x‘, ‘2‘], [‘x‘, ‘1‘, ‘x‘, ‘1‘, ‘y‘, ‘1‘], [‘x‘, ‘1‘, ‘x‘, ‘1‘, ‘y‘, ‘2‘], [‘x‘, ‘1‘, ‘x‘, ‘1‘, ‘z‘, ‘1‘], [‘x‘, ‘1‘, ‘x‘, ‘1‘, ‘z‘, ‘2‘], [‘x‘, ‘1‘, ‘x‘, ‘2‘, ‘x‘, ‘1‘], [‘x‘, ‘1‘, ‘x‘, ‘2‘, ‘x‘, ‘2‘], [‘x‘, ‘1‘, ‘x‘, ‘2‘, ‘y‘, ‘1‘], [‘x‘, ‘1‘, ‘x‘, ‘2‘, ‘y‘, ‘2‘], [‘x‘, ‘1‘, ‘x‘, ‘2‘, ‘z‘, ‘1‘], [‘x‘, ‘1‘, ‘x‘, ‘2‘, ‘z‘, ‘2‘], [‘x‘, ‘1‘, ‘y‘, ‘1‘, ‘x‘, ‘1‘], [‘x‘, ‘1‘, ‘y‘, ‘1‘, ‘x‘, ‘2‘], [‘x‘, ‘1‘, ‘y‘, ‘1‘, ‘y‘, ‘1‘], [‘x‘, ‘1‘, ‘y‘, ‘1‘, ‘y‘, ‘2‘], [‘x‘, ‘1‘, ‘y‘, ‘1‘, ‘z‘, ‘1‘], [‘x‘, ‘1‘, ‘y‘, ‘1‘, ‘z‘, ‘2‘], [‘x‘, ‘1‘, ‘y‘, ‘2‘, ‘x‘, ‘1‘], [‘x‘, ‘1‘, ‘y‘, ‘2‘, ‘x‘, ‘2‘], [‘x‘, ‘1‘, ‘y‘, ‘2‘, ‘y‘, ‘1‘], [‘x‘, ‘1‘, ‘y‘, ‘2‘, ‘y‘, ‘2‘], [‘x‘, ‘1‘, ‘y‘, ‘2‘, ‘z‘, ‘1‘], [‘x‘, ‘1‘, ‘y‘, ‘2‘, ‘z‘, ‘2‘], [‘x‘, ‘1‘, ‘z‘, ‘1‘, ‘x‘, ‘1‘], [‘x‘, ‘1‘, ‘z‘, ‘1‘, ‘x‘, ‘2‘], [‘x‘, ‘1‘, ‘z‘, ‘1‘, ‘y‘, ‘1‘], [‘x‘, ‘1‘, ‘z‘, ‘1‘, ‘y‘, ‘2‘], [‘x‘, ‘1‘, ‘z‘, ‘1‘, ‘z‘, ‘1‘], [‘x‘, ‘1‘, ‘z‘, ‘1‘, ‘z‘, ‘2‘], [‘x‘, ‘1‘, ‘z‘, ‘2‘, ‘x‘, ‘1‘], [‘x‘, 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通过打印两个关键列表，看懂了，pools是把两个字符串分割成两个元组重复了三遍，result为列表推导式，先执行后面的for循环，等于是把result中的6个元组里的元素分别组合了一遍成为一个个列表，整体是个二维列表，最后的for循环yield把二维列表中的一个个列表变为元组