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

• stops = {'TTA': 0,
  • 'TTG': 0, 'CTA': 0, 'CTC': 0, 'CTG': 0, 'CTT': 0}

  sec = for line in fasta:

  • if line[0] != '>':

    • sec += line.strip()
  for i in range(0,len(sec),3):
  • if sec[i:i+3] in stops:
    • stops[sec[i:i+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:

• stops = {'TTA': 0,
  • 'TTG': 0, 'CTA': 0, 'CTC': 0, 'CTG': 0, 'CTT': 0}

  sec = for line in fasta:

  • if line[0] != '>':

    • sec += line.strip()
  for i in range(0,len(sec),3):
  • if sec[i:i+3] in stops:
    • stops[sec[i:i+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:

• stops = {'TTA': 0,
  • 'TTG': 0, 'CTA': 0, 'CTC': 0, 'CTG': 0, 'CTT': 0}

  sec = for line in fasta:

  • if line[0] != '>':

    • sec += line.strip()
  for i in range(0,len(sec),3):
  • if sec[i:i+3] in stops:
    • stops[sec[i:i+3]] += 1
  print('Mycoplasma pneumoniae:') for key, val in stops.items():
  • print(key, val, sep=' ')