【每日一题1104】提取数字

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1

:woman_mage: 给定一个不小心混进了字母的数字串，请编写一个函数，提取出其中的数字。

示例：
输入："a6b6c6"，输出：666。
输入："aa 112 3dd"，输出：1123。

题目难度：简单
题目来源：codewars： Filter the number

def get_int(words: str) -> int:
    pass

assert get_int("a1b2c3") == 123
assert get_int("aa1bb2cc3dd") == 123
assert get_int("hogwarts666") == 666
2 
def get_int(words: str) -> int:
    return int(''.join([w for w in words if w.isdigit()]))


assert get_int("a1b2c3") == 123
assert get_int("aa1bb2cc3dd") == 123
assert get_int("hogwarts666") == 666
2 Likes
3 
def get_int(words:str) -> int:
    result = 0
    for i in words:
        if i.isdigit():
            result = result*10 + int(i)
    return result

这个算法还存在一些问题，如果要将所有的数字提取，那么对前置0的处理不对
但是返回int类型，前置0是可以去掉的

4

public static String get_int(String text){
String text_int = “”;
for(char ch : text.toCharArray()){
if(Character.isDigit(ch)){
text_int = text_int + ch;}
}
return text_int;
}

5 
    public String getInt(String str){
        String res ="";
        char[] chars = str.toCharArray();
        for (Character c:chars) {
            if (Character.isDigit(c)){
                res+=c;
            }
        }
        return res;
    }
7 
def get_int(self, words: str) -> int:
    '''
    给定一个不小心混进了字母的数字串，请编写一个函数，提取出其中的数字。

    示例：
    输入："a6b6c6"，输出：666。
    输入："aa 112 3dd"，输出：1123
    :return:
    '''
    num:int = 0
    for word in words:
        if word >= "0" and word <= "9":
            word = int(word)
            num = num *10 + word
        else:
            continue
    return num
8

有点简单

def get_int(words:str):
    res=''
    for i in words:
        if ord(i)>=48 and ord(i)<=57:
            res=res+i
    return int(res)
9 
def get_int(words: str) -> int:
    li=[]
    for i in words:
        if i.isdigit():
            li.append(i)
            
    result=int("".join(li))
    return result

assert get_int("a1b2c3") == 123
assert get_int("aa1bb2cc3dd") == 123
assert get_int("hogwarts666") == 666
10 
def get_int(word:str)->int:
    str_list = re.split(r'\D',word)
    num_list =[]
    for i in str_list:
        if i != '':
            num_list.append(i)
    num = int(''.join(num_list))
    return num
11

import re
def get_int(words:str):

c =
for i in words:
if re.search("\d", i):
c.append(re.search("\d", i).group())

return int("".join(c))

assert get_int(“a1b2c3”) == 123
assert get_int(“aa1bb2cc3dd”) == 123
assert get_int(“hogwarts666”) == 666

12

Python参考题解

def get_int(words: str) -> int:
    return int(''.join(filter(str.isdigit, words)))

assert get_int("a1b2c3") == 123
assert get_int("aa1bb2cc3dd") == 123
assert get_int("hogwarts666") == 666

思路：使用内置函数filter()过滤出由数字组成的列表，然后拼接成数字字符串，最后使用int()函数转成数字类型并返回。

13

Java参考题解：

public class Kata {
    public static long filterString(final String value) {
        return Long.valueOf(value.replaceAll("\\D", ""));
    }
}
14 
def get_int(words: str) -> int:
    return int(''.join([i for i in words if i.isdigit()]))

assert get_int("a1b2c3") == 123
assert get_int("aa1bb2cc3dd") == 123
assert get_int("hogwarts666") == 666
15 
def get_int(words: str) -> int:
    return int(''.join([item for item in list(words) if ord(item)<97]))

assert get_int("a1b2c3") == 123
assert get_int("aa1bb2cc3dd") == 123
assert get_int("hogwarts666") == 666
16 
def get_int(words):
    result = ""
    for word in words:
        if word.isdigit():
            result += word
    result = int(result)
    #print(result)
    return result


assert get_int("a1b2c3") == 123
assert get_int("aa1bb2cc3dd") == 123
assert get_int("hogwarts666") == 666
17 
def get_int(words: str) -> int:
    c = []
    for i in words:
        if i.isdigit():
            c.append(i)
    return eval(''.join(c))


assert get_int("a1b2c3") == 123
assert get_int("aa1bb2cc3dd") == 123
assert get_int("hogwarts666") == 666
18 
from functools import reduce
def get_int2(words: str) -> int:
    mode = "0123456789"
    return reduce(lambda x,y: 10*x+y,[int(w) for w in words if w in mode])

assert get_int("a1b2c3") == 123
assert get_int("aa1bb2cc3dd") == 123
assert get_int("hogwarts666") == 666

assert get_int("ho0gwarts666") == 666
assert get_int("hog666war0ts") == 6660
19 
def get_int(words: str) -> int:
    num_list = []
    for i in words:
        if i.isdigit():
            num_list.append(i)
    return ''.join(num_list)
20 
def get_int(words: str) -> int:
    words_list = list(words)
    number_list = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]
    result = [i for i in words_list if i in number_list]
    return int("".join(result))


assert get_int("a1b2c3") == 123
assert get_int("aa1bb2cc3dd") == 123
assert get_int("hogwarts666") == 666
21 
import re

def get_int(words: str) -> int:
    return int("".join(re.findall("\d+",words)))


assert get_int("a1b2c3") == 123
assert get_int("aa1bb2cc3dd") == 123
assert get_int("hogwarts666") == 666