Python 具有计算值和非计算值的元组列表？
我的Python 具有计算值和非计算值的元组列表？,python,list,mapping,tuples,immutability,Python,List,Mapping,Tuples,Immutability,我的元组s的前两个元素是计算的（见下文），但我希望它们是3-元组s，而不是2-元组s，最后一个元素设置为1 from itertools import permutations if __name__ == '__main__': alphabet='abcdefghijklmnopqrstuvwxyz' print list(permutations(alphabet,2)) : 试图有效地做到这一点： [('a', 'b', 1), ('a', 'c', 1), ('a'
元组元组元组1from itertools import permutations
if __name__ == '__main__':
alphabet='abcdefghijklmnopqrstuvwxyz'
print list(permutations(alphabet,2))
[('a', 'b', 1), ('a', 'c', 1), ('a', 'd', 1), ('a', 'e', 1), ('a', 'f', 1), ('a', 'g', 1), ('a', 'h', 1), ('a', 'i', 1), ('a', 'j', 1), ('a', 'k', 1), ('a', 'l', 1), ('a', 'm', 1), ('a', 'n', 1), ('a', 'o', 1), ('a', 'p', 1), ('a', 'q', 1), ('a', 'r', 1), ('a', 's', 1), ('a', 't', 1), ('a', 'u', 1), ('a', 'v', 1), ('a', 'w', 1), ('a', 'x', 1), ('a', 'y', 1), ('a', 'z', 1), ('b', 'a', 1), ('b', 'c', 1), ('b', 'd', 1), ('b', 'e', 1), ('b', 'f', 1), ('b', 'g', 1), ('b', 'h', 1), ('b', 'i', 1), ('b', 'j', 1), ('b', 'k', 1), ('b', 'l', 1), ('b', 'm', 1), ('b', 'n', 1), ('b', 'o', 1), ('b', 'p', 1), ('b', 'q', 1), ('b', 'r', 1), ('b', 's', 1), ('b', 't', 1), ('b', 'u', 1), ('b', 'v', 1), ('b', 'w', 1), ('b', 'x', 1), ('b', 'y', 1), ('b', 'z', 1), ('c', 'a', 1), ('c', 'b', 1), ('c', 'd', 1), ('c', 'e', 1), ('c', 'f', 1), ('c', 'g', 1), ('c', 'h', 1), ('c', 'i', 1), ('c', 'j', 1), ('c', 'k', 1), ('c', 'l', 1), ('c', 'm', 1), ('c', 'n', 1), ('c', 'o', 1), ('c', 'p', 1), ('c', 'q', 1), ('c', 'r', 1), ('c', 's', 1), ('c', 't', 1), ('c', 'u', 1), ('c', 'v', 1), ('c', 'w', 1), ('c', 'x', 1), ('c', 'y', 1), ('c', 'z', 1), ('d', 'a', 1), ('d', 'b', 1), ('d', 'c', 1), ('d', 'e', 1), ('d', 'f', 1), ('d', 'g', 1), ('d', 'h', 1), ('d', 'i', 1), ('d', 'j', 1), ('d', 'k', 1), ('d', 'l', 1), ('d', 'm', 1), ('d', 'n', 1), ('d', 'o', 1), ('d', 'p', 1), ('d', 'q', 1), ('d', 'r', 1), ('d', 's', 1), ('d', 't', 1), ('d', 'u', 1), ('d', 'v', 1), ('d', 'w', 1), ('d', 'x', 1), ('d', 'y', 1), ('d', 'z', 1), ('e', 'a', 1), ('e', 'b', 1), ('e', 'c', 1), ('e', 'd', 1), ('e', 'f', 1), ('e', 'g', 1), ('e', 'h', 1), ('e', 'i', 1), ('e', 'j', 1), ('e', 'k', 1), ('e', 'l', 1), ('e', 'm', 1), ('e', 'n', 1), ('e', 'o', 1), ('e', 'p', 1), ('e', 'q', 1), ('e', 'r', 1), ('e', 's', 1), ('e', 't', 1), ('e', 'u', 1), ('e', 'v', 1), ('e', 'w', 1), ('e', 'x', 1), ('e', 'y', 1), ('e', 'z', 1), ('f', 'a', 1), ('f', 'b', 1), ('f', 'c', 1), ('f', 'd', 1), ('f', 'e', 1), ('f', 'g', 1), ('f', 'h', 1), ('f', 'i', 1), 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('n', 'i', 1), ('n', 'j', 1), ('n', 'k', 1), ('n', 'l', 1), ('n', 'm', 1), ('n', 'o', 1), ('n', 'p', 1), ('n', 'q', 1), ('n', 'r', 1), ('n', 's', 1), ('n', 't', 1), ('n', 'u', 1), ('n', 'v', 1), ('n', 'w', 1), ('n', 'x', 1), ('n', 'y', 1), ('n', 'z', 1), ('o', 'a', 1), ('o', 'b', 1), ('o', 'c', 1), ('o', 'd', 1), ('o', 'e', 1), ('o', 'f', 1), ('o', 'g', 1), ('o', 'h', 1), ('o', 'i', 1), ('o', 'j', 1), ('o', 'k', 1), ('o', 'l', 1), ('o', 'm', 1), ('o', 'n', 1), ('o', 'p', 1), ('o', 'q', 1), ('o', 'r', 1), ('o', 's', 1), ('o', 't', 1), ('o', 'u', 1), ('o', 'v', 1), ('o', 'w', 1), ('o', 'x', 1), ('o', 'y', 1), ('o', 'z', 1), ('p', 'a', 1), ('p', 'b', 1), ('p', 'c', 1), ('p', 'd', 1), ('p', 'e', 1), ('p', 'f', 1), ('p', 'g', 1), ('p', 'h', 1), ('p', 'i', 1), ('p', 'j', 1), ('p', 'k', 1), ('p', 'l', 1), ('p', 'm', 1), ('p', 'n', 1), ('p', 'o', 1), ('p', 'q', 1), ('p', 'r', 1), ('p', 's', 1), ('p', 't', 1), ('p', 'u', 1), ('p', 'v', 1), ('p', 'w', 1), ('p', 'x', 1), ('p', 'y', 1), ('p', 'z', 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('v', 'i', 1), ('v', 'j', 1), ('v', 'k', 1), ('v', 'l', 1), ('v', 'm', 1), ('v', 'n', 1), ('v', 'o', 1), ('v', 'p', 1), ('v', 'q', 1), ('v', 'r', 1), ('v', 's', 1), ('v', 't', 1), ('v', 'u', 1), ('v', 'w', 1), ('v', 'x', 1), ('v', 'y', 1), ('v', 'z', 1), ('w', 'a', 1), ('w', 'b', 1), ('w', 'c', 1), ('w', 'd', 1), ('w', 'e', 1), ('w', 'f', 1), ('w', 'g', 1), ('w', 'h', 1), ('w', 'i', 1), ('w', 'j', 1), ('w', 'k', 1), ('w', 'l', 1), ('w', 'm', 1), ('w', 'n', 1), ('w', 'o', 1), ('w', 'p', 1), ('w', 'q', 1), ('w', 'r', 1), ('w', 's', 1), ('w', 't', 1), ('w', 'u', 1), ('w', 'v', 1), ('w', 'x', 1), ('w', 'y', 1), ('w', 'z', 1), ('x', 'a', 1), ('x', 'b', 1), ('x', 'c', 1), ('x', 'd', 1), ('x', 'e', 1), ('x', 'f', 1), ('x', 'g', 1), ('x', 'h', 1), ('x', 'i', 1), ('x', 'j', 1), ('x', 'k', 1), ('x', 'l', 1), ('x', 'm', 1), ('x', 'n', 1), ('x', 'o', 1), ('x', 'p', 1), ('x', 'q', 1), ('x', 'r', 1), ('x', 's', 1), ('x', 't', 1), ('x', 'u', 1), ('x', 'v', 1), ('x', 'w', 1), ('x', 'y', 1), ('x', 'z', 1), ('y', 'a', 1), ('y', 'b', 1), ('y', 'c', 1), ('y', 'd', 1), ('y', 'e', 1), ('y', 'f', 1), ('y', 'g', 1), ('y', 'h', 1), ('y', 'i', 1), ('y', 'j', 1), ('y', 'k', 1), ('y', 'l', 1), ('y', 'm', 1), ('y', 'n', 1), ('y', 'o', 1), ('y', 'p', 1), ('y', 'q', 1), ('y', 'r', 1), ('y', 's', 1), ('y', 't', 1), ('y', 'u', 1), ('y', 'v', 1), ('y', 'w', 1), ('y', 'x', 1), ('y', 'z', 1), ('z', 'a', 1), ('z', 'b', 1), ('z', 'c', 1), ('z', 'd', 1), ('z', 'e', 1), ('z', 'f', 1), ('z', 'g', 1), ('z', 'h', 1), ('z', 'i', 1), ('z', 'j', 1), ('z', 'k', 1), ('z', 'l', 1), ('z', 'm', 1), ('z', 'n', 1), ('z', 'o', 1), ('z', 'p', 1), ('z', 'q', 1), ('z', 'r', 1), ('z', 's', 1), ('z', 't', 1), ('z', 'u', 1), ('z', 'v', 1), ('z', 'w', 1), ('z', 'x', 1), ('z', 'y', 1)]
（我很高兴它是嵌套的
列表元组print [x + (1,) for x in a]
您可以将最后一行更改为：
print [x + (1,) for x in a]
在打印一份之前，插入
a = [(x, y, 1) for x, y in a]
list(permutations([alphabet[i],alphabet[i+1]]))
[(x, y, 1) for x, y in permutations(alphabet, 2)]
[p + (1,) for p in permutations(alphabet, k)]
在打印一份之前，插入
a = [(x, y, 1) for x, y in a]
list(permutations([alphabet[i],alphabet[i+1]]))
[(x, y, 1) for x, y in permutations(alphabet, 2)]
[p + (1,) for p in permutations(alphabet, k)]
您可以在每个生成的排列上循环并附加静态1：
from itertools import permutations
if __name__ == '__main__':
alphabet='abcdefghijklmnopqrstuvwxyz'
a=[]
for i in xrange(len(alphabet)-1):
a+=[x + (1,) for x in permutations([alphabet[i],alphabet[i+1]])]
print a
from itertools import permutations
if __name__ == '__main__':
alphabet='abcdefghijklmnopqrstuvwxyz'
a=[]
for i in xrange(len(alphabet)-1):
a+=[(l1, l2, 1) for (l1, l2) in permutations([alphabet[i],alphabet[i+1]])]
print a
这两种变体都会产生所需的输出，并且效率接近您的
列表（生成器）from itertools import permutations
if __name__ == '__main__':
alphabet='abcdefghijklmnopqrstuvwxyz'
a=[]
for i in xrange(len(alphabet)-1):
a+=[x + (1,) for x in permutations([alphabet[i],alphabet[i+1]])]
print a
from itertools import permutations
if __name__ == '__main__':
alphabet='abcdefghijklmnopqrstuvwxyz'
a=[]
for i in xrange(len(alphabet)-1):
a+=[(l1, l2, 1) for (l1, l2) in permutations([alphabet[i],alphabet[i+1]])]
print a
这两种变体都能产生所需的输出，并且效率接近您的
列表（生成器）[x + (1,) for x in list(permutations(alphabet,2))+[(alpha, alpha) for alpha in alphabet]]
如果有更有效的方法，我仍感兴趣…我当前的解决方案，以防有人仍感兴趣：
[x + (1,) for x in list(permutations(alphabet,2))+[(alpha, alpha) for alpha in alphabet]]
如果有更有效的方法，我还是会感兴趣的，不过…并不能真正解决问题的实质，是不是，只是修改了打印的声明..谢谢，非常有用。但不确定是否有更有效的解决方案……并不能真正解决问题的实质，是吗，只是修改了打印的声明……谢谢，非常有用。但不确定是否有更有效的解决方案……2个字母的排列太过分了！等等，我刚意识到我没有得到我所期望的。如何获取它们？请注意，创建一个空列表并在循环中附加项目是一个非常糟糕的迹象。首先，您使用的是list concat，其中
list.append（）list.append（）