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How to create random DNA sequences with Python

by Jack Simpson

Python’s random module makes it extremely easy to generate random DNA bases.

import random
dna = ["A","G","C","T"]
#output a random base
print(random.choice(dna))

Now to generate a specific number of random bases, all we have to do is use Python’s range function:

import random
dna = ["A","G","C","T"]
#initialise empty string
#this is where the bases will be added as they are generated
random_sequence=''
# We'll create a string of 100 random bases
for i in range(0,100):
    random_sequence+=random.choice(dna)
print(random_sequence)

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