#!/usr/bin/env python3 import itertools import sys def decimal_to_alphabet(n: int, alphabet: str) -> str: if n == 0: return alphabet[0] base = len(alphabet) digits = [] while n: digits.append(alphabet[n % base]) n //= base return ''.join(digits[::-1]) def alphabet_to_decimal(s: str, alphabet: str) -> int: base = len(alphabet) l = len(s) return sum(alphabet.index(s[l - 1 - i]) * base ** i for i in range(l)) def test(): assert alphabet_to_decimal('ff', '0123456789abcdef') == 255 assert alphabet_to_decimal('100', '0123456789abcdef') == 256 assert decimal_to_alphabet(255, '0123456789abcdef') == 'ff' assert decimal_to_alphabet(256, '0123456789abcdef') == '100' assert decimal_to_alphabet(0, '0123456789') == '0' if __name__ == '__main__': if len(sys.argv) == 2 and sys.argv[1] == '--test': test() elif len(sys.argv) == 4 or (len(sys.argv) == 5 and sys.argv[2] == '--decimal'): if len(sys.argv) == 4: alphabet = sys.argv[1] start, stop = map(lambda x: alphabet_to_decimal(x, alphabet), sys.argv[2:]) else: alphabet = sys.argv[1] start, stop = map(int, sys.argv[3:]) for i in range(start, stop + 1): try: sys.stdout.write(decimal_to_alphabet(i, alphabet) + '\n') except (BrokenPipeError, IOError): try: sys.stdout.close() except IOError: pass break else: print('Usage: alphabetseq ALPHABET [--decimal] START STOP', file = sys.stderr) print('Generates the sequence from START to STOP (inclusive) using ALPHABET', file = sys.stderr) print('By default, START and STOP are expressed in ALPHABET. With --decimal, they are treated as decimal values instead.', file = sys.stderr) print('`alphabetseq 0123456789 $N $M` is equivalent to `seq $N $M`.', file = sys.stderr)