Skip to content

Itertools.combinations

This are use for combinatory construct, the usage of this methods is focus provide a series of tuples with all the sequence or set of numbers or letters used in the iterator.

1
combinations(iterator, r)

Here r is an input, it represent the size of different combinations that are possible

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
from itertools import combinations

letters ="victor"

# size of combination is set to 3
a = combinations(letters, 3)
comb = [' '.join(i) for i in a]

print(comb)

#['vic', 'vit', 'vio', 'vir', 'vct', 'vco', 'vcr', 'vto', 'vtr', 'vor', 'ict', 'ico', 'icr', 'ito', 'itr', 'ior', 'cto', 'ctr', 'cor', 'tor']

Itertools.combinations

itertools.combinations() | HackerRank

Problem definition

Task

You are given a string.Your task is to print all possible combinations, up to size, of the string in lexicographic sorted order.

Input Format

A single line containing the string and integer value separated by a space.

Output Format

Print the different combinations of string on separate lines.

Sample Input

HACK 2

Implementation

1
2
3
4
5
6
7
from itertools import combinations

s , n  = input().split()

for i in range(1, int(n)+1):
    for j in combinations(sorted(s), i):
        print(''.join(j))
  • s is the string
  • n the length of the combination
  • for loop, using a range that will be from 1 to the n+1 , range upper limit not inclusive thus the +1
  • Second for loop this time using the combination it is using sorted() to sort the string.