How to split a string into equal sized parts?

Question

I have a string that contains a sequence of nucleotides. The string is 1191 nucleotides long.

How do I print the sequence in a format which each line only has 100 nucleotides? right now I have it hard coded but I would like it to work for any string of nucleotides. here is the code I have now

def printinfasta(SeqName, Sequence, SeqDescription):
    print(SeqName + " " + SeqDescription)
    #how do I make sure to only have 100 nucleotides per line?
    print(Sequence[0:100])
    print(Sequence[100:200])
    print(Sequence[200:300])
    print(Sequence[400:500])
    print(Sequence[500:600])
    print(Sequence[600:700])
    print(Sequence[700:800])
    print(Sequence[800:900])
    print(Sequence[900:1000])
    print(Sequence[1000:1100])
    print(Sequence[1100:1191])
printinfasta(SeqName, Sequence, SeqDescription)

Sequence = "NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNCCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAATCCATAAATCCCTAAAACCATAATCCTAAATCCCTTAATTCCTAAATCCCTAATACTTAGACCCTAATCTTTAGTTCCTAGACCCTAATCTTTAGTTCCTAGACCCTAAATCCATAATCCTTAATTCCTAAATTCCTAAATCCCTAATACTAAATCTCTAAATCCCTAGCAATTTTCAAGTTTTGCTTGATTGTTGTAGGATGGTCCTTTCTCTTGTTTCTTCTCTGTGTTGTTGAGATTAGTTTGTTTAGGTTTGATAGCGTTGATTTTGGCCTGCGTTTGGTGACTCATATGGTTTGATTGGAGTTTGTTTCTGGGTTTTATGGTTTTGGTTGAAGCGACATTTTTTTGTGGAATATGGTTTTTGCAAAATATTTTGTTCCGGATGAGTAATATCTACGGTGCTGCTGTGAGAATTATGCTATTGTTTT"

Answer 1

You can use textwrap.wrap to split long strings into list of strings

import textwrap

seq = "NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNCCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAATCCATAAATCCCTAAAACCATAATCCTAAATCCCTTAATTCCTAAATCCCTAATACTTAGACCCTAATCTTTAGTTCCTAGACCCTAATCTTTAGTTCCTAGACCCTAAATCCATAATCCTTAATTCCTAAATTCCTAAATCCCTAATACTAAATCTCTAAATCCCTAGCAATTTTCAAGTTTTGCTTGATTGTTGTAGGATGGTCCTTTCTCTTGTTTCTTCTCTGTGTTGTTGAGATTAGTTTGTTTAGGTTTGATAGCGTTGATTTTGGCCTGCGTTTGGTGACTCATATGGTTTGATTGGAGTTTGTTTCTGGGTTTTATGGTTTTGGTTGAAGCGACATTTTTTTGTGGAATATGGTTTTTGCAAAATATTTTGTTCCGGATGAGTAATATCTACGGTGCTGCTGTGAGAATTATGCTATTGTTTT"
print('\n'.join(textwrap.wrap(seq, width=100)))

Answer 2

You can use itertools.zip_longest and some iter magic to get this in one line:

from itertools import zip_longest

sequence = "NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNCCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAATCCATAAATCCCTAAAACCATAATCCTAAATCCCTTAATTCCTAAATCCCTAATACTTAGACCCTAATCTTTAGTTCCTAGACCCTAATCTTTAGTTCCTAGACCCTAAATCCATAATCCTTAATTCCTAAATTCCTAAATCCCTAATACTAAATCTCTAAATCCCTAGCAATTTTCAAGTTTTGCTTGATTGTTGTAGGATGGTCCTTTCTCTTGTTTCTTCTCTGTGTTGTTGAGATTAGTTTGTTTAGGTTTGATAGCGTTGATTTTGGCCTGCGTTTGGTGACTCATATGGTTTGATTGGAGTTTGTTTCTGGGTTTTATGGTTTTGGTTGAAGCGACATTTTTTTGTGGAATATGGTTTTTGCAAAATATTTTGTTCCGGATGAGTAATATCTACGGTGCTGCTGTGAGAATTATGCTATTGTTTT" 

output = [''.join(filter(None, s)) for s in zip_longest(*([iter(sequence)]*100))]

Or:

for s in zip_longest(*([iter(sequence)]*100)):
    print(''.join(filter(None, s)))