python - 在 AND 和 OR 处拆分字符串，保留分隔符

Question

我想分割以下字符串

string = "events.error > 5 AND timeseries.temperature < 20 OR variants.battery = 'Li' AND vehicle.name = 'Audi'"

在 AND 和 OR 位置，这样我就可以返回以下列表

list = ["events.error > 5", "AND", "timeseries.temperature < 20", "OR", "variants.battery = 'Li'", "AND", "vehicle.name = 'Audi'"]

我尝试了 string.split() 但组也被空格分割。您知道更好的方法吗？

Answer 1

最简单的方法是使用re.split，将分隔符放在一个组中将使其保留在输出中:

import re

string = "events.error > 5 AND timeseries.temperature < 20 AND variants.battery = 'Li' AND vehicle.name = 'Audi'"

re.split(r'(AND)', string)

输出:

['events.error > 5 ',
 'AND',
 ' timeseries.temperature < 20 ',
 'AND',
 " variants.battery = 'Li' ",
 'AND',
 " vehicle.name = 'Audi'"]

<小时/>

编辑:当您添加第二个分隔符“OR”时，更新版本:

import re

string = "events.error > 5 AND timeseries.temperature < 20 OR variants.battery = 'Li' AND vehicle.name = 'Audi'"

re.split(r'(AND|OR)', string)

输出:

['events.error > 5 ',
 'AND',
 ' timeseries.temperature < 20 ',
 'OR',
 " variants.battery = 'Li' ",
 'AND',
 " vehicle.name = 'Audi'"]

如果您想删除字符串周围的空格，您可以在分隔符中包含任意数量的前导和尾随空格，但要在组之外，以便它们不会出现在输出中:

import re

string = "events.error > 5 AND timeseries.temperature < 20 OR variants.battery = 'Li' AND vehicle.name = 'Audi'"

re.split(r'\s*(AND|OR)\s*', string)  # include the spaces in the separator, 
                                     # but don't keep them 

输出:

['events.error > 5',
 'AND',
 'timeseries.temperature < 20',
 'OR',
 "variants.battery = 'Li'",
 'AND',
 "vehicle.name = 'Audi'"]