Given a list of sequences and contig names, write out a fasta.

writeFasta.py

def writeFasta(titles=[], sequences=[], filename='tmp.fasta'):
	if len(titles) != len(sequences):
		titles = ['contig_{}'.format(i) for i in range(len(sequences))]

	# Initial new file
	with open(filename, 'w') as fasta:
		fasta.write('')

	with open(filename, 'a') as fasta:
		for t, s in zip(titles,sequences):
			fasta.write('> {}\n'.format(t))
			s_wNewlines = re.sub("(.{80})","\\1\n", s, 0, re.DOTALL)
			fasta.write(s_wNewlines+'\n')