问题描述：
python string
求教：function name ：
count_digits:
(str) -> int
描述：Return the total number of characters in the given string that are digits.For example,the String '123abc456' has 3 characters which are non-digits,and 6 characters which are digits.
这个应该怎写?
求教：function name ：
count_digits:
(str) -> int
描述：Return the total number of characters in the given string that are digits.For example,the String '123abc456' has 3 characters which are non-digits,and 6 characters which are digits.
这个应该怎写?
问题解答：
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