random-dna.py

#!/usr/bin/env python
#=========================================================================
# This is OPEN SOURCE SOFTWARE governed by the Gnu General Public
# License (GPL) version 3, as described at www.opensource.org.
# Copyright (C)2016 William H. Majoros (martiandna@gmail.com).
#=========================================================================
from __future__ import (absolute_import, division, print_function, 
   unicode_literals, generators, nested_scopes, with_statement)
from builtins import (bytes, dict, int, list, object, range, str, ascii,
   chr, hex, input, next, oct, open, pow, round, super, filter, map, zip)
import random
import ProgramName
import sys
from FastaWriter import FastaWriter

if(len(sys.argv)!=3):
    exit(ProgramName.get()+" <length> <id>")
L=int(sys.argv[1])
id=sys.argv[2]
seq=""
alphabet=("A","C","G","T")
for i in range(L):
    index=int(random.random()*4)
    nuc=alphabet[index]
    seq+=nuc

writer=FastaWriter()
writer.addToFasta(">"+id,seq,sys.stdout)