import numpy as np
import logging

logger = logging.getLogger('ttl')
logger.setLevel(logging.DEBUG)


def standard_deviation(array):
    return np.std(array)


def changes(array):
    current = array[0]
    changes = 0

    for item in array:
        if item != current:
            changes += 1
        current = item
    return changes


# specific ranges: [0, 1], [1, 100], [100, 300], [300, 900], [900, inf]
def specific_range(ttl):
    specific_ttl_ranges = 4  # default is [900, inf]

    try:
        ttl = int(ttl)
    except ValueError:
        logger.error('ttl not a number')
        return specific_ttl_ranges

    if 0 < ttl <= 1:
        specific_ttl_ranges = 0
    elif 1 < ttl <= 100:
        specific_ttl_ranges = 1
    elif 100 < ttl <= 300:
        specific_ttl_ranges = 2
    elif 300 < ttl <= 900:
        specific_ttl_ranges = 3
    return specific_ttl_ranges


if __name__ == "__main__":
    exit()