关于将相同编号的子列表链接在一起的python [英] python about linking sublist with same number together
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问题描述
我需要将具有相同元素的子列表分组在一起 例如:
I need to group sublists with the same elements together For example:
list1 =[[1, 0], [2, 1], [30, 32]]
将链接[1, 0]
和[2, 1]
在一起,因为它们都包含1
,并且两者将合并为[0, 1, 2]
would link [1, 0]
and [2, 1]
together since they both contain 1
and those two would combine into [0, 1, 2]
因此,链接后,新列表应类似于:
So after linking, the new list should be like:
new_list1 = [[1, 0, 2], [30, 32]]
IE:子列表中不应有相同的数字,顺序也不重要.
IE: there shouldn't be same number inside a sub-list and order is not important.
一个更长的例子:
list2 = [[2, 3], [4, 3], [6, 5], [7, 6], [7, 8], [13, 14], [30, 32]]
链接后为
new_list2 = [[2, 3, 4], [6, 5, 7, 8], [13, 14], [30, 32]]
那么如何以一般的方式完成呢?
So how can this be done in a general way?
推荐答案
要以常规方式对子列表进行分组,您可以:
To group the sublists in a general way you can:
def linking_sublists(lists):
index = {}
sets = []
for l in lists:
found = None
for i in l:
if i in index:
# this list has an element we have already seen
if found:
# combine two sets
to_remove = index[i]
if found != to_remove:
for j in index[i]:
found.add(j)
index[j] = found
to_remove.clear()
else:
found = index[i]
if found is not None:
s = found
for i in l:
s.add(i)
else:
s = set(l)
sets.append(s)
for i in l:
index[i] = s
return [list(sorted(s)) for s in sets if s]
方法:
此函数使用集合和索引 dict
来将具有匹配元素的任何列表归为一组,并跟踪
list_2 = [[2, 3], [4, 3], [6, 5], [7, 6], [7, 8], [13, 14], [30, 32]]
print(linking_sublists(list_2))
list_3 = [[2, 3], [4, 3], [6, 5], [7, 6], [7, 8], [30, 32], [4, 5], [3, 4]]
print(linking_sublists(list_3))
结果:
[[2, 3, 4], [5, 6, 7, 8], [13, 14], [30, 32]]
[[2, 3, 4, 5, 6, 7, 8], [30, 32]]
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