Emanuele , , , , . : aa... zz. , , -, , , , say 'y' 'af' ( 'z' 'aa'). , , , .
def strange(start, end_or_len, sequence='ABCDEFGHIJKLMNOPQRSTUVWXYZ'):
"""Create a generator of a range of 'sequential' strings from
start to end_or_len if end_or_len is a string or containing
end_or_len entries if end_or_len is an integer.
>>> list(strange('D', 'F'))
['D', 'E', 'F']
>>> list(strange('Y', 'AB'))
['Y', 'Z', 'AA', 'AB']
>>> list(strange('Y', 4))
['Y', 'Z', 'AA', 'AB']
>>> list(strange('A', 'BAA', sequence='AB'))
['A', 'B', 'AA', 'AB', 'BA', 'BB', 'AAA', 'AAB', 'ABA', 'ABB', 'BAA']
>>> list(strange('A', 11, sequence='AB'))
['A', 'B', 'AA', 'AB', 'BA', 'BB', 'AAA', 'AAB', 'ABA', 'ABB', 'BAA']
"""
seq_len = len(sequence)
start_int_list = [sequence.find(c) for c in start]
if isinstance(end_or_len, int):
inclusive = True
end_int_list = list(start_int_list)
i = len(end_int_list) - 1
end_int_list[i] += end_or_len - 1
while end_int_list[i] >= seq_len:
j = end_int_list[i]
end_int_list[i] = end_int_list[i] % seq_len
if i == 0:
end_int_list.insert(0, j-1)
else:
i -= 1
end_int_list[i] += j
else:
end_int_list = [sequence.find(c) for c in end_or_len]
while len(start_int_list) < len(end_int_list) or start_int_list <= end_int_list:
yield ''.join([sequence[i] for i in start_int_list])
i = len(start_int_list)-1
start_int_list[i] += 1
while start_int_list[i] >= seq_len:
start_int_list[i] = 0
if i == 0:
start_int_list.insert(0,0)
else:
i -= 1
start_int_list[i] += 1
if __name__ =='__main__':
import doctest
doctest.testmod()