Strings Of Two Letters And Fixed Length

I'm wondering how to generate a list of all possible two-letter strings of length 10 in Python. For example, the list would go: aaaaaaaaaa aaaaaaaaab aaaaaaaaba aaaaaaaabb ... ...

Solution 1:

from itertools importproductprod= [''.join(p) for p in product('ab', repeat=10)]

or if you just want to print it like in your example:

from itertools import product

for p in product('ab', repeat=10):
    print(''.join(p))

See the documentation for itertools.product

Solution 2:

You can count from 0 to 2**10-1, convert those numbers using bin and replace 0/1 with a/b. Just pad the left side with 0's to the right length.

Solution 3:

defs(d):
  if d:
    for c in'ab':
      for rest in s(d-1):
        yield c + rest
  else:
    yield''printlist(s(10))

or

def x(d):
  return ([ 'a' + q for q in x(d-1) ] +
          [ 'b' + q for q in x(d-1) ]) if d else [ '' ]

print x(10)