

In [42]:

    
dna_string = "CTCCGAGGGCGTCTCGGAGAACAGAGTTTATAATAAGGGTTACGGCTCCTACCTTATCGCTAAGCGGATAAGGCCGTGTTGGACGAAGGTTCACGCTGCCTCTACGTGGATTACGTCGGTACCACATGACGCCTGAGGACAATGTATATCGTTCCCCTGCTCTGCCCTCCATTATTGGTATGAAATTCATTCTCTCAGCTGGCCTATGGGGCCCGGAACGCGGAAGTAGCGCTGCGAATTGCGCCGGCTCCGGCAGAAAGCATCAAGAGTGTGCATAGATTCACAAACCATTTACTTGGGCTTCCCGTCCACCTTTGAATCAAGACAGCACTTGCTTTCACGCTAAGCTATTTACATCCGCACGTCGTGTCATCGGTTACGGCTCACTTCAAGCCACTGTGGCGCTTAATTCCCTTCAGTTGATGTGGGCTCGCGAGCGGATAGAAGCAACCGCACGCATGCTCGAAGTACTACACGCCCAACAAATCGCGAGGAATGAATGCTCAGCGGAGGGACCACCATGTAACCTAGGGCGAGTTACGAGTAGGAGACGCCCACAGATGTGCACCCTGGGGCAGAGTGCAAAGACCCTGCCATGGCTTTGAGTTCGCTGTTCTACTAATATGGCGAATCTTTAACGCCGACAATTGTCGGCAACGGTAAGCAACCCTCTCATCCTCATTTGTAGTCAAATGTGATTACGGGTTCTGAGATACGGGCAATCACCAATGTAACATGAACCGTTCGTACAGGGTAAAAAACCGGCCGTTTTGGAGGTGCGGGGCTCATATCCCCTTTGAGCTACCCACTACGAACGGTGGAACCTAGTCAGCCCGGCCTGAGCGAGTTACGCCAAGATACTGGTTTGCGCCAATCATAAAGCCTCTCCACCATGGTTGGTCAACCGAATTACCTCCAATTGCTCG"

a = 0
g = 0
t = 0
c = 0

for base in dna_string:
    if(base == "A"):
        a = a + 1
    elif(base == "G"):
        g = g + 1
    elif(base == "T"):
        t = t + 1
    else:
        c = c + 1

"{0} {1} {2} {3}".format(a,c,g,t)









    Out[42]:





'225 251 233 217'