4 examples of 'python iterate through alphabet' in Python

178
def lexicographic(alphabet):
179
    for n in count():
180
        for e in product(alphabet, repeat = n):
181
            yield e

141
def __iter__(self):
142
    for i in range(len(self)):
143
        yield self._flip[i]

32
def _generateAlphabet(needle, haystack):
33
    alphabet = {}
34
    for letter in haystack:
35
        if letter not in alphabet:
36
            letterPositionInNeedle = 0
37
            for symbol in needle:
38
                letterPositionInNeedle = letterPositionInNeedle << 1
39
                letterPositionInNeedle |= int(letter != symbol)
40
            alphabet[letter] = letterPositionInNeedle
41
    return alphabet

639
def _force_alphabet(record_iterator, alphabet):
640
    """Iterate over records, over-riding the alphabet (PRIVATE)."""
641
    # Assume the alphabet argument has been pre-validated
642
    given_base_class = _get_base_alphabet(alphabet).__class__
643
    for record in record_iterator:
644
        if isinstance(_get_base_alphabet(record.seq.alphabet), given_base_class):
645
            record.seq.alphabet = alphabet
646
            yield record
647
        else:
648
            raise ValueError(
649
                "Specified alphabet %r clashes with "
650
                "that determined from the file, %r" % (alphabet, record.seq.alphabet)
651
            )