Question

I have the following code:

import string
import random

d =[random.choice(string.uppercase) for x in xrange(3355)]
s = "".join(d)

print s

At the moment it prints out a random sequence of letters from the alphabet. But, i need it to print out a sequence of letters containing only four letters for example ‘A’, ‘C’, ‘U’, ‘G’. How would this be accomplished?

Thanks

Quinn

Answer 1

Change the set you are asking random.choice to pick from:

import random

d =[random.choice('ACUG') for x in xrange(3355)]
s = "".join(d)

print s

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Edit: As SilentGhost points out, if your ultimate goal is only to make a string, skipping the intermediate list is more memory-efficient:

s = "".join(random.choice('ACUG') for x in xrange(3355))