使用python从时间列表中创建平均值

Answer 1

从午夜开始换算成秒数和平均值有问题。如果你在23:50和00:10的时候这样做，你会在你想要的时候得到12:00。

更好的方法是average the angles。

import datetime
import math
import numpy

def datetime_to_radians(x):
    # radians are calculated using a 24-hour circle, not 12-hour, starting at north and moving clockwise
    time_of_day = x.time()
    seconds_from_midnight = 3600 * time_of_day.hour + 60 * time_of_day.minute + time_of_day.second
    radians = float(seconds_from_midnight) / float(12 * 60 * 60) * 2.0 * math.pi
    return radians

def average_angle(angles):
    # angles measured in radians
    x_sum = numpy.sum([math.sin(x) for x in angles])
    y_sum = numpy.sum([math.cos(x) for x in angles])
    x_mean = x_sum / float(len(angles))
    y_mean = y_sum / float(len(angles))
    return numpy.arctan2(x_mean, y_mean)

def radians_to_time_of_day(x):
    # radians are measured clockwise from north and represent time in a 24-hour circle
    seconds_from_midnight = int(float(x) / (2.0 * math.pi) * 12.0 * 60.0 * 60.0)
    hour = seconds_from_midnight / 3600
    minute = (seconds_from_midnight % 3600) / 60
    second = seconds_from_midnight % 60
    return datetime.time(hour, minute, second)

def average_times_of_day(x):
    # input datetime.datetime array and output datetime.time value
    angles = [datetime_to_radians(y) for y in x]
    avg_angle = average_angle(angles)
    return radians_to_time_of_day(avg_angle)

average_times_of_day([datetime.datetime(2017, 6, 9, 0, 10), datetime.datetime(2017, 6, 9, 0, 20)])
# datetime.time(0, 15)

average_times_of_day([datetime.datetime(2017, 6, 9, 23, 50), datetime.datetime(2017, 6, 9, 0, 10)])
# datetime.time(0, 0)

Answer 2

下面是@eumiro对答案的一个可能实现，但是这个逻辑只有在这些是持续时间，而不是@lazyr指出的时间时才起作用：

from datetime import timedelta

times = ['00:58:00','00:59:00','01:00:00','01:01:00','01:02:00']

print(str(timedelta(seconds=sum(map(lambda f: int(f[0])*3600 + int(f[1])*60 + int(f[2]), map(lambda f: f.split(':'), times)))/len(times))))

Also thanks to a post作者@silenghost，and a post作者@Herms

Answer 3

你不想以这种方式“平均”小时、分钟和秒的次数：

00:59:00
01:01:00

对01:00:00的平均值很清楚，但不符合您提出的逻辑。

相反，将所有时间间隔转换为秒，计算平均值并转换回HH:MM:SS。

00:59:00 -> 3540 seconds
01:01:00 -> 3660 seconds
            ============
average:    3600 seconds converted to HH:MM:SS -> 01:00:00