generates a random sequence of length over alphabet

random_sequence.py

def rand_seq(alphabet, length):
    """
    generates a random sequence of length over alphabet
    
    @param alphabet: alphabet from which to choose characters
    @type alphabet: list<str>
    @param length: length of random string
    @type length: int
    """

    for c in alphabet:

        if len(c)>1:
            print "warning: individual tokens of length > 1: " + c

    seq = "".join([random.choice(alphabet) for j in range(length)])

    return seq