使用Python已知平均值求隨機數

產生20個數，範圍是10-100之間，平均值為66

import random


def int_random(average, begin, end):
    """
    產生隨機整數
    第一個數隨機產生，第二個使用平均數求出
    :param average:     平均數
    :param begin:       起始區間
    :param end:         結束區間
    :return:
    """
    arr_num = [0 for x in range(2)]
    i = 0
    while True:
        # 第一個數
        first_number = random.randrange(begin, end)

        # 第二個數
        second_number = average * 2 - first_number

        if begin <= second_number <= end:
            arr_num[i] = first_number
            i += 1
            arr_num[i] = second_number
            break

    return arr_num


def main():
    count = 20
    average = 66
    begin = 10
    end = 100
    avg_count = int(count / 2)

    int_arr_count = 0
    arr_number = [0 for x in range(count)]
    for i in range(avg_count):
        number_list = int_random(average=average, begin=begin, end=end)
        for j in range(len(number_list)):
            arr_number[int_arr_count] = number_list[j]
            int_arr_count += 1

    random.shuffle(arr_number)
    return arr_number


if __name__ == '__main__':
    main()