python swapping characters in string

1def swap(string, i, j):
2    """
3    Swapping between 2 given indices of a chars in a string
4    :param string: string
5    :param i: first index
6    :param j: second index
7    :return: new string with the swapped chars
8    """
9    string = list(string)
10    string[i], string[j] = string[j], string[i]
11    return ''.join(string)
12
13# EXAMPLE
14str = "example"
15print(swap(str, 0, 1)) # print "xeample"