# Python | Permutation of a given string using inbuilt function

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.

Examples:

```Input :  str = 'ABC'
Output : ABC
ACB
BAC
BCA
CAB
CBA```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

We have existing solution for this problem please refer Permutations of a given string using STL link. We can also solve this problem in python using inbuilt function permutations(iterable).

 `# Function to find permutations of a given string ` `from` `itertools ``import` `permutations ` ` `  `def` `allPermutations(``str``): ` `      `  `     ``# Get all permutations of string 'ABC' ` `     ``permList ``=` `permutations(``str``) ` ` `  `     ``# print all permutations ` `     ``for` `perm ``in` `list``(permList): ` `         ``print` `(''.join(perm)) ` `       `  `# Driver program ` `if` `__name__ ``=``=` `"__main__"``: ` `    ``str` `=` `'ABC'` `    ``allPermutations(``str``) `

Output:

```ABC
ACB
BAC
BCA
CAB
CBA
```

Permutation and Combination in Python

Permutations of a given string with repeating characters
The idea is to use dictionary to avoid printing duplicates.

 `from` `itertools ``import` `permutations ` `import` `string ` ` `  `s ``=` `"GEEK"` `a ``=` `string.ascii_letters ` `p ``=` `permutations(s) ` ` `  `# Create a dictionary ` `d ``=` `[] ` `for` `i ``in` `list``(p): ` ` `  `    ``# Print only if not in dictionary ` `    ``if` `(i ``not` `in` `d): ` `        ``d.append(i) ` `        ``print``(''.join(i)) `

Output:

```GEEK
GEKE
GKEE
EGEK
EGKE
EEGK
EEKG
EKGE
EKEG
KGEE
KEGE
KEEG
```

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