python - 从列表列表中提取数字

Question

我有这个列表列表:

my_list=[['word:', 'house', 'garden', '0,2%'],
 ['word:', 'house', 'garden', '0,2%'],
 ['house', 'garden', '0,2%'],
 ['house', 'garden', '0,2%'],
 ['garden', '0,2%', '0,125%'],
 ['house', '0,2%', '?????'],
 ['house', 'garden', '0,02%'],
 ['house', 'garden', '0,02%'],
 ['garden', '0,02%'],
 ['house', 'garden', '0,2%'],
 ['garden', '0,2%'],
 ['house', '0,2'],
 ['house', '0,2', '%'],
 ['house', 'garden', 'kids', '0,2%'],
 ['house', 'garden', 'kids', '0,2%'],
 ['house', '0,2%', 'boy'],
 ['house', '0,12%'],
 ['house', '4%.'],
 ['house', '4%.', '4.'],
 ['house', '0,2%”.']]

我需要根据单词 house 和 garden 提取数字，以便得到如下内容:

{'garden': ['0,2', '0,2', '0,2', '0,2', '0,2', '0.125', '0.02', '0.02', '0.02', '0.2', '0.2', '0,2'], 'house': ['0.2', '0.2', '0.2', '0.2', '0,2', '0,02', '0,02', '0,2', '0,2', '0,2', '0,2', '0,2', ,'0,2','0,12', '4.', '4.', '4.', '0,2']}

我怎样才能得到这些值？

不幸的是这段代码:

result = defaultdict(list)

for l in my_list:
    k = None
    for v in l:
        if v in keywords:
            k = v
        if re.match(r'[0-9,.]+$', v): 
            num = v
    if k is not None:
        result[k].append(num)

它没有给我预期的输出。

Answer 1

问题出在您的正则表达式上。您需要删除 $ anchor ，如果有任何内容(例如 % 字符)跟随预期字符，即 [0- 9,.].其余的代码也可以稍微简化一下:

import re
from collections import defaultdict

my_list=[['word:', 'house', 'garden', '0,2%'],
 ['word:', 'house', 'garden', '0,2%'],
 ['house', 'garden', '0,2%'],
 ['house', 'garden', '0,2%'],
 ['garden', '0,2%', '0,125%'],
 ['house', '0,2%', '?????'],
 ['house', 'garden', '0,02%'],
 ['house', 'garden', '0,02%'],
 ['garden', '0,02%'],
 ['house', 'garden', '0,2%'],
 ['garden', '0,2%'],
 ['house', '0,2'],
 ['house', '0,2', '%'],
 ['house', 'garden', 'kids', '0,2%'],
 ['house', 'garden', 'kids', '0,2%'],
 ['house', '0,2%', 'boy'],
 ['house', '0,12%'],
 ['house', '4%.'],
 ['house', '4%.', '4.'],
 ['house', '0,2%".']]

result = defaultdict(list)
keywords = ['house', 'garden']
for l in my_list:
    numbers = [v for v in l if re.match(r'[0-9,.]+', v)]
    for v in l:
        if v in keywords:
            result[v].extend(numbers)
print(result)

打印:

defaultdict(<class 'list'>, {'house': ['0,2%', '0,2%', '0,2%', '0,2%', '0,2%', '0,02%', '0,02%', '0,2%', '0,2', '0,2', '0,2%', '0,2%', '0,2%', '0,12%', '4%.', '4%.', '4.', '0,2%".'], 'garden': ['0,2%', '0,2%', '0,2%', '0,2%', '0,2%', '0,125%', '0,02%', '0,02%', '0,02%', '0,2%', '0,2%', '0,2%', '0,2%']})