How to join two sets in one line without using

Question

Assume that S and T are assigned sets  Without using the join operator    how can I find the union of the two sets  This  for example  finds the intersection    S    1  2  3  4  T    3  4  5  6  S intersect T     i for i in S if i in T     So how can I find the union of two sets in one line without using

User · Answer

If by join you mean union  try this   set list s    list t     It s a bit of a hack  but I can t think of a better one liner to do it

User · Answer

You can do union or simple list comprehension   A add    for   in B    A would have all the elements of B

User · Answer

You can use union method for sets  set union other set   Note that it returns a new set i e it doesn t modify itself

User · Answer

You could use or  alias    gt  gt  gt  from operator import or   gt  gt  gt  from functools import reduce   python3 required  gt  gt  gt  reduce or     1  2  3  4    3  4  5  6    set  1  2  3  4  5  6

User · Answer

You can just unpack both sets into one like this    gt  gt  gt  set 1    1  2  3  4   gt  gt  gt  set 2    3  4  5  6   gt  gt  gt  union     set 1   set 2   gt  gt  gt  union  1  2  3  4  5  6    The   unpacks the set  Unpacking is where an iterable  e g  a set or list  is represented as every item it yields  This means the above example simplifies to  1  2  3  4  3  4  5  6  which then simplifies to  1  2  3  4  5  6  because the set can only contain unique items

User · Answer

If you are fine with modifying the original set  which you may want to do in some cases   you can use set update     S update T    The return value is None  but S will be updated to be the union of the original S and T

User · Answer

Assuming you also can t use s union t   which is equivalent to s   t  you could try   gt  gt  gt  from itertools import chain  gt  gt  gt  set chain s t   set  1  2  3  4  5  6     Or  if you want a comprehension    gt  gt  gt   i for j in  s t  for i in j  set  1  2  3  4  5  6

User · Answer

Suppose you have 2 lists   A    1 2 3 4   B    3 4 5 6    so you can find A Union B as follow    union   set A  union set B     also if you want to find intersection and non-intersection you do that as follow   intersection   set A  intersection set B    non intersection   union - intersection

[python] How to join two sets in one line without using "|"

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