每题多学点——Count Digits 【Python】

一、原题

(原题链接Count Digits - python coding challenges - Py.CheckiO)

You need to count the number of digits in a given string.
Input	String.
Output	Integer
Examples:	assert count_digits("hi") == 0 assert count_digits("who is 1st here") == 1 assert count_digits("my numbers is 2") == 1 assert ( count_digits( "This picture is an oil on canvas painting by Danish artist Anna Petersen between 1845 and 1910 year" ) == 8 )

二、解题

1）思路：

        遍历字符串；统计数字；

        关键问题：text中混有非数值型的字符串，那就不能使用强制转换为int的语句，否则程序运行中会出错

2）my way

1)直接比较字符串中的每个字符，是否与0-9的字符相同（侧向于字符方面）

def count_digits(text: str) -> int:
    count