如何在数字的数字之间添加空格？

def add_space_between_digits(number):
    number_str = str(number)
    result = ""
    for i in range(len(number_str)):
        result += number_str[i]
        if i < len(number_str) - 1:
            result += " "
    return result

# 示例用法
number = 1234567890
result = add_space_between_digits(number)
print(result)  # 输出：1 2 3 4 5 6 7 8 9 0