Question

In python, how to extract some char from each item of a list ?

e.g. in a list, each item (modelName) has

  cfn99e1195_1.lp

The numbers inside may be different.

I need to get 99 and 1195.

I tried

 findN = modelName.find('n')  
 findE = modelName.find('e')
 nodeNum = modelName(findN, findE) 
 findBar = modelName.find('_')  
 arcNum = modelName(findE, findBar) 

does not work.

thanks

Answer 1

consider using regular expressions:

import re

pattern = re.compile(r'^cfn(\d+)e(\d+)')
a, b = pattern.match('cfn99e1195_1.lp').groups()