[英]manipulation of a list of strings containing digits to output a list of of digits
I looking for help in manipulating a list of strings where I want to extract the digits such has : 我在处理要提取数字的字符串列表时寻求帮助:
x = ['aa bb qq 2 months 60%', 'aa bb qq 3 months 70%', 'aa bb qq 1 month 80%']
I am trying to get to : 我想去:
[[2.0,60.0],[3.0,70.0],[1.0,80.0]]
in a elegant fashion. 以优雅的方式。
The first number should always be an integer but the second number can be a float with a decimal value 第一个数字应始终为整数,但第二个数字可以为带十进制值的浮点数
my dirty work around is this: 我周围的肮脏工作是这样的:
x_split = [y.replace("%", "").split() for y in x]
x_float = [[float(s) for s in x if s.isdigit()] for x in x_split]
Out[100]: [[2.0, 60.0], [3.0, 70.0], [1.0, 80.0]]
Use a regular expression to match integers and floats. 使用正则表达式匹配整数和浮点数。
import re
[[float(n) for n in re.findall(r'\d+\.?\d*', s)] for s in x]
Explanation for the regex ( r'\\d+\\.?\\d*'
): 正则表达式(
r'\\d+\\.?\\d*'
)的说明:
r # a raw string so that back slashes are not converted
\d # digit 0 to 9
+ # one or more of the previous pattern (\d)
\. # a decimal point
? # zero or one of the previous pattern (\.)
\d # digit 0 to 9
* # zero or more of the previous pattern (\d)
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