Problem 3.4
Random DNA Sequence
Write a function random_dna_sequence
to generate a DNA sequence of given length by taking nucleotides selected at random.
>>> random_dna_sequence(4)
'TCAC'
>>> random_dna_sequence(10)
'GCTGCTGGCA'
Hint: Use of the random.choice
function from random
module which selects random element from a list/string.
>>> random.choice("ABCD")
'B'
>>> random.choice("ABCD")
'C'
>>> random.choice("ABCD")
'C'
>>> random.choice("ABCD")
'D'
Solution
import random
def random_dna_sequence(n):
return "".join(random.choice("ATGC") for i in range(n))