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