import re
x = [['AATG', 'ATAT', 'GGCC'],
['CCTA', 'TCGT', 'AAAA'],
['TTAA', 'GGAT', 'TACA']]
pattern = re.compile('[AT]{4}')
y = []
for i in range(len(x[0])):
y.append(len([j[i] for j in x if pattern.match(j[i])])/len(x))
print(y)
aW1wb3J0IHJlCgp4ID0gW1snQUFURycsICdBVEFUJywgJ0dHQ0MnXSwKICAgICBbJ0NDVEEnLCAnVENHVCcsICdBQUFBJ10sCiAgICAgWydUVEFBJywgJ0dHQVQnLCAnVEFDQSddXQoKcGF0dGVybiA9IHJlLmNvbXBpbGUoJ1tBVF17NH0nKQoKeSA9IFtdCmZvciBpIGluIHJhbmdlKGxlbih4WzBdKSk6CiAgICB5LmFwcGVuZChsZW4oW2pbaV0gZm9yIGogaW4geCBpZiBwYXR0ZXJuLm1hdGNoKGpbaV0pXSkvbGVuKHgpKQpwcmludCh5KQ==