输入一个字符串，分别统计字符串中字母，数字，空格和其字符的个数用代码怎么表示

你可以使用Python编程语言来实现这个功能。以下是一个示例代码：

string = input("请输入一个字符串：")

count_alpha = 0
count_digit = 0
count_space = 0
count_other = 0

for char in string:
    if char.isalpha():
        count_alpha += 1
    elif char.isdigit():
        count_digit += 1
    elif char.isspace():
        count_space += 1
    else:
        count_other += 1

print("字母个数：", count_alpha)
print("数字个数：", count_digit)
print("空格个数：", count_space)
print("其他字符个数：", count_other)

运行程序后，在控制台输入一个字符串，程序将会统计其中字母、数字、空格和其他字符的个数，并输出结果。