Given a text file with one DNA sequence on each line and joining these together I now want to split the string into 5 sequences (corresponding to each of the 5 rows).

This is the file source: http://www.programmingforbiologists.org/data/dna_sequences_1.txt

This is my code:

import numpy
dna_data=numpy.loadtxt("dna_sequences",dtype=str)
",".join(dna_data)
seq1,seq2,seq3,seq4,seq5=dna_data.split(",",4)

I am getting this error message:

AttributeError: 'numpy.ndarray' object has no attribute 'split' 

As stated by @jadsq, there is not need for several variables here.

However, to address the error itself and as a reference for anyone facing the same error. The correct syntax for splitting a numpy array is:

seq1,seq2,seq3,seq4,seq5 = numpy.split(dna_data,5)