未知题型

输入一个字符串，统计其中数字字符出现的次数。字符串长度不超过1000.

【参考答案】

要统计一个字符串中数字字符出现的次数，可以遍历字符串中的每个字符，检查它是否是数字字符，如果是，则增加计数器的值。在Py......

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