如何从字符串列表中提取数字? [英] How to extract numbers from a list of strings?

问题描述

我应该如何只从

a = ['1 2 3', '4 5 6', 'invalid']

我试过了:

mynewlist = [s for s in a if s.isdigit()]
print mynewlist

和

for strn in a:
    values = map(float, strn.split())
print values

都失败了，因为数字之间有空格.

Both failed because there is a space between the numbers.

注意:我试图实现输出为:

Note: I am trying to achieve output as:

[1, 2, 3, 4, 5, 6]

推荐答案

我认为您需要将 list 中的每个项目作为空格上的拆分字符串进行处理.

I think you need to process each item in the list as a split string on whitespace.

a = ['1 2 3', '4 5 6', 'invalid']
numbers = []
for item in a:
    for subitem in item.split():
        if(subitem.isdigit()):
            numbers.append(subitem)
print(numbers)

['1', '2', '3', '4', '5', '6']

或者在一个整洁的理解中:

Or in a neat and tidy comprehension:

[item for subitem in a for item in subitem.split() if item.isdigit()]

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