All permulation algorithm written in Python.

perm.py

"""
Permulation algorithm implemented in Python.
"""
array = range(1, 4)


def perm(array, lower, upper):
    if lower >= upper:
        print array
    else:
        for elem in array[lower:]:
            i = array.index(elem)
            array[i], array[lower] = array[lower], array[i]
            perm(array, lower + 1, upper)
            array[i], array[lower] = array[lower], array[i]

if __name__ == "__main__":
    perm(array, 0, len(array))