定义一个 compare 函数和一个 max_value 函数，compare 函数用于比较两个数的大小，max_value 函数用于得到一串整型数据中的最大值。用python

以下是 compare 函数的实现：

def compare(num1, num2):
    if num1 > num2:
        return "num1 is greater than num2"
    elif num1 < num2:
        return "num2 is greater than num1"
    else:
        return "num1 and num2 are equal"

以下是 max_value 函数的实现：

def max_value(numbers):
    max_num = numbers[0]
    for num in numbers:
        if num > max_num:
            max_num = num
    return max_num

使用示例：

print(compare(5, 10))  # 输出 "num2 is greater than num1"
print(compare(7, 7))   # 输出 "num1 and num2 are equal"

numbers = [3, 8, 1, 9, 4]
print(max_value(numbers))  # 输出 9