How to create multiple random sequences in python?

I'm trying to make 200 random DNA sequences, and I can't figure out how to make 200 of them! Here's what I have so far:

from random import random

def randABCD(n, probA, probT, probC, probG):
    # where probA + probT + probC + probG == 1
    # n = number of characters in string
    # pX = probability of the character
    cA = probA
    cT = cA + probT
    cC = cT + probC
    def choose():
        r = random()
        if r < cA:
           return 'A'
        elif r < cT:
           return 'T'
        elif r < cC:
           return 'C'
        else:
           return 'G'
    return ''.join([choose() for i in xrange(n)])