从对创建一个元组

Question

我想创建一个元组，它显示两个元组中所有可能的对

这是我想收到的示例：

first_tuple = (1, 2)
second_tuple = (4, 5)
mult_tuple(first_tuple, second_tuple)

输出：

((1, 4), (4, 1), (1, 5), (5, 1), (2, 4), (4, 2), (2, 5), (5, 2))

这是我所做的，但看起来有点麻烦：

def mult_tuple(tuple1, tuple2):
    ls=[]
    for t1 in tuple1:

        for t2 in tuple2:
            c=(t1,t2)
            d=(t2,t1)
            ls.append(c)
            ls.append(d)

    return tuple(ls)


first_tuple = (1, 2) 
second_tuple = (4, 5) 
mult_tuple(first_tuple, second_tuple)  

我编写的代码有效，但是我正在寻找更好的代码
提前谢谢你

Answer 1

first_tuple = (1, 2)
second_tuple = (4, 5)

out = []
for val in first_tuple:
    for val2 in second_tuple:
        out.append((val, val2))
        out.append((val2, val))

print(tuple(out))

打印：

((1, 4), (4, 1), (1, 5), (5, 1), (2, 4), (4, 2), (2, 5), (5, 2))

Answer 2

你可以使用itertools的product和permutations：

from itertools import product, permutations

first_tuple, second_tuple = (1, 2), (4, 5)

result = ()

for tup in product(first_tuple, second_tuple):
    result += (*permutations(tup),)

print(result)

输出：

((1, 4), (4, 1), (1, 5), (5, 1), (2, 4), (4, 2), (2, 5), (5, 2))

product 产生由嵌套 for 循环结构（您的 t1 和 t2 变量）同样产生的元组（两个元素），而 permutations 产生由您的 c 和 @ 产生的两个排列987654334@变量。

Answer 3

这是一个丑陋的单线。

first_tuple = (1, 2)
second_tuple = (4, 5)
tups = [first_tuple, second_tuple]
res = [(i, j) for x in tups for y in tups for i in x for j in y if x is not y]
# [(1, 4), (1, 5), (2, 4), (2, 5), (4, 1), (4, 2), (5, 1), (5, 2)]

除非您将其用于运动，否则您可能应该使用更具可读性的解决方案，例如下面是 MrGeek 的一个。

Answer 4

itertools.product 给你你想要的。但是，由于两个元组的笛卡尔积不可交换 (product(x,y) != product(y,x))，因此您需要计算两者并将结果连接起来。

>>> from itertools import chain, product
>>> x = (1,4)
>>> y = (2, 5)
>>> list(chain(product(x,y), product(y,x)))
[(1, 2), (1, 5), (4, 2), (4, 5), (2, 1), (2, 4), (5, 1), (5, 4)]

（您可以在此处使用 chain 代替 permutations，因为 2 元组只有两个排列，很容易显式指定。）

Answer 5

如果您想避免使用标准库 (itertools)，那么只需结合两个列表推导式：

result = [(x, y) for x in first_tuple for y in second_tuple]
result.extend( (x, y) for x in second_tuple for y in first_tuple )

如果对您很重要，请转换为 tuple。

Answer 6

你也可以这样做：

from itertools import permutations 
t1=(1,2)
t2=(3,4)
my_tuple=tuple([key for key in filter(lambda x: x!=t1 and (x!=t2),list(permutations(t1+t2,2)))])

Answer 7

使用不需要import 的列表理解的单行器。

t1 = (1, 2)
t2 = (4, 5)

>>> sorted([t for i in t1 for j in t2 for t in ((i, j), (j, i))])
# [(1, 4), (1, 5), (2, 4), (2, 5), (4, 1), (4, 2), (5, 1), (5, 2)]

---

当然，对于“来自两个元组的所有可能对意味着”结果中最多有八个元组对。您可以显式引用它们，如果这是时间关键代码，这应该是最快的解决方案（如果不需要排序，它会更快）。

>>> sorted(((t1[0], t2[0]), (t1[0], t2[1]), (t1[1], t2[0]), (t1[1], t2[1]), 
            (t2[0], t1[0]), (t2[0], t1[1]), (t2[1], t1[0]), (t2[1], t1[1])))
# [(1, 4), (1, 5), (2, 4), (2, 5), (4, 1), (4, 2), (5, 1), (5, 2)]

---

可选：使用set 确保只返回唯一的对。

t1 = (1, 2)
t2 = (1, 2)

>>> sorted([t for i in t1 for j in t2 for t in ((i, j), (j, i))])
# [(1, 1), (1, 1), (1, 2), (1, 2), (2, 1), (2, 1), (2, 2), (2, 2)]

>>> sorted(set([t for i in t1 for j in t2 for t in ((i, j), (j, i))]))
# [(1, 1), (1, 2), (2, 1), (2, 2)]

Answer 8

def mul_tup(tup1, tup2):
        l=[]

        for x in tup1:
            for y in tup2:
                a=(x,y)
                b=(y,x)
                l.append(a)
                l.append(b)

        return tuple(l)

first_tup= tuple([eval(x) for x in input("enter the values: ").split(',')])
second_tup= tuple([eval(x) for x in input("enter the values: ").split(',')])
q = mult_tup(first_tup, second_tup)
print(q)

Answer 9

我的方式在一行中：

[item for sublist in [[(i,j),(j,i)] for i in first_tuple for j in second_tuple] for item in sublist]

[(1, 4), (4, 1), (1, 5), (5, 1), (2, 4), (4, 2), (2, 5), (5, 2)]