Python Program to print all permutations of a given string

A permutation, also called an “arrangement number” or “order, ” is a rearrangement of the elements of an ordered list S into a one-to-one correspondence with S itself. A string of length n has n! permutation.
Source: Mathword(http://mathworld.wolfram.com/Permutation.html)

Below are the permutations of string ABC.
ABC ACB BAC BCA CBA CAB

Recommended: Please solve it on “PRACTICE ” first, before moving on to the solution.

Python

filter_none

edit
close

play_arrow

link
brightness_4
code

# Python program to print all permutations with
# duplicates allowed
  
def toString(List):
    return ''.join(List)
  
# Function to print permutations of string
# This function takes three parameters:
# 1. String
# 2. Starting index of the string
# 3. Ending index of the string.
def permute(a, l, r):
    if l == r:
        print toString(a)
    else:
        for i in xrange(l, r + 1):
            a[l], a[i] = a[i], a[l]
            permute(a, l + 1, r)
            a[l], a[i] = a[i], a[l] # backtrack
  
# Driver program to test the above function
string = "ABC"
n = len(string)
a = list(string)
permute(a, 0, n-1)
  
# This code is contributed by Bhavya Jain

chevron_right


Output:



ABC
ACB
BAC
BCA
CBA
CAB

Please refer complete article on Write a program to print all permutations of a given string for more details!



My Personal Notes arrow_drop_up


Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.