Python permutations

Permutations

def perm(text):
  if len(text) == 1:
    return [text]
  else:
    sub_perm = perm(text[1:])
    first = text[0]
    permutations = list()
    for subset in sub_perm:
        for i in range(len(subset)+1):
            permutations.append(subset[:i]+ first+subset[i:])
    return permutations

print(perm('1234'))