основной:

stops = ['TAA','TAG','TGA']

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

• for line in fasta:

  • if line[0] == '>':

    • header = line.strip()[1:]

      names[header] =

    else:
    • names[header] += line.strip()

for key, val in names.items():

• for i in range(0,len(val[:-3]),3):
  • if val[i:i+3] in stops:
    • print(key) break

вспомогательный:

• sec = for line in fasta:

  • if line[0] != '>':

    • sec += line.strip()
  i = 0 while i != len(sec):
  • if sec[i:i+3] in stops:
    • stops[sec[i:i+3]] += 1
    i += 3

with open('out.txt', 'w') as output:

• for key, val in stops.items():
  • print(key, val, sep=' ', file=output)