编写程序，实现总个数、求和、平均值、方差、中位数等基本统计值的计算。

编写一个简单的程序，用于计算一组数字的基本统计值，可以按照以下步骤进行：

1. **数据输入**：首先，需要用户输入一组数值，通常存储在一个列表或数组中。

numbers = list(map(int, input("请输入一串数字，用空格分隔：").split()))

2. **函数定义**：创建函数分别计算总个数、求和、平均值、方差和中位数。

def count_numbers(numbers):
    return len(numbers)

def sum_of_numbers(numbers):
    return sum(numbers)

def average(numbers):
    return sum_of_numbers(numbers) / count_numbers(numbers)

def variance(numbers):
    avg = average(numbers)
    return sum((x - avg) ** 2 for x in numbers) / count_numbers(numbers)

def median(numbers):
    numbers.sort()
    length = count_numbers(numbers)
    if length % 2 == 0:
        return (numbers[length // 2] + numbers[length // 2 - 1]) / 2
    else:
        return numbers[length // 2]

3. **计算并输出结果**：将每个函数的结果打印出来。

total_count = count_numbers(numbers)
sum_value = sum_of_numbers(numbers)
avg = average(numbers)
variance_result = variance(numbers)
median_result = median(numbers)

print(f"总个数：{total_count}")
print(f"求和：{sum_value}")
print(f"平均值：{avg}")
print(f"方差：{variance_result}")
print(f"中位数：{median_result}")