combn function in R equivalent in Python (Generate all combination of n elements)

Question

Function combn(x,m) in R generates all combination of the elements x taken m at a time. For instance,

t(combn(5,2))
      [,1] [,2]
 [1,]    1    2
 [2,]    1    3
 [3,]    1    4
 [4,]    1    5
 [5,]    2    3
 [6,]    2    4
 [7,]    2    5
 [8,]    3    4
 [9,]    3    5
[10,]    4    5

How can I have the same result in python? I know scipy.misc.comb gives just the result not the list and I also read this article which seems different and needs a given list at first not just simply two integer numbers.

Answer 1

itertools.combinations(iterable, r)

This generates an iterable of r length tuples. If you want it as a list, so you can see everything:

list(itertools.combinations(range(1,6), 2))
# [(1, 2), (1, 3), (1, 4), (1, 5), (2, 3), (2, 4), (2, 5), (3, 4), (3, 5), (4, 5)]