file = '/Users/svetlana/Downloads/E.coli.sequence.txt' with open(file, 'r') as fasta:

• names = {} stops = {'TGA': 0,
  • 'TAA': 0, 'TAG': 0}

  sec = for line in fasta:

  • if line[0] == '>':

    • header = line.strip()[1:]

      names[header] =

    else:
    • names[header] += line.strip()
  for val in names.values():
  • if val[-3:] in stops:
    • stops[val[-3:]] += 1
  print('E.coli:') for key, val in stops.items():
  • print(key, val, sep=' ')

file = '/Users/svetlana/Downloads/Candidatus_Gracilibacteria_bacterium.sequence.txt' with open(file, 'r') as fasta:

• names = {} stops = {'TGA': 0,
  • 'TAA': 0, 'TAG': 0}

  sec = for line in fasta:

  • if line[0] == '>':

    • header = line.strip()[1:]

      names[header] =

    else:
    • names[header] += line.strip()
  for val in names.values():
  • if val[-3:] in stops:
    • stops[val[-3:]] += 1
  print('Candidatus Gracilibacteria bacterium:') for key, val in stops.items():
  • print(key, val, sep=' ')

file = '/Users/svetlana/Downloads/Mycoplasma_pneumoniae.sequence.txt' with open(file, 'r') as fasta:

• names = {} stops = {'TGA': 0,
  • 'TAA': 0, 'TAG': 0}

  sec = for line in fasta:

  • if line[0] == '>':

    • header = line.strip()[1:]

      names[header] =

    else:
    • names[header] += line.strip()
  for val in names.values():
  • if val[-3:] in stops:
    • stops[val[-3:]] += 1
  print('Mycoplasma pneumoniae:') for key, val in stops.items():
  • print(key, val, sep=' ')