frange

frange.py

def get_round_digits(step):
    """
    Given input step, determine the number of digits step can be rounded to and
    still equal step (limit 53)
    """
    round_digits = 1
    while round(step, round_digits) != step and round_digits <= 53:
        round_digits += 1
    if round_digits > 1:
        round_digits -= 1
    return round_digits


def frange(start, end, step):
    """
    A float range generator. Only start is included in the output.
    """
    result = []
    while start + step < end:
        result.append(start)
        start += step

    round_digits = get_round_digits(step)
    if round(start, round_digits) < round(end, round_digits):
        result.append(start)
    return result