Python generates 20 random DNA fasta format files

Generate 20 random files, the file name may be duplicated because no hash name is used

There are 30-50 sequences in each file

Each sequence has a length of 70-120 base

import osimport randomimport stringprint  (dir (string)) Letter = string.ascii_ Lettersos.chdir ("d:\\") Bases = {1: "A",  2: "T",  3: "C",  4: "G"}## test random  module , get random dna basenth = random.randint (1,4) print  ( Bases[nth]) ## create random dna sequencesfor i in range ():     number_of_seq = random.randint (30,50)     filename = letter [I]    with open ("Sequences" +filename +                str (NUMBER_OF_SEQ) +  ". Fasta",  "W")  as  file_output:        for j in range (NUMBER_OF_SEQ) :             each_seq= ""           &nbsP;  rand_len = random.randint (70,120)              for k in range (Rand_len):                 nth = random.randint (1,4)                  each_seq += bases[nth]             file_output.write (">seq_" +str ( NUMBER_OF_SEQ) +                                 "_" +str (rand_ Len) + "\ n")             file_output.write (each_Seq+ " \ n ")

Python generates 20 random DNA fasta format files