Parsing multiple values for a key with ConfigParser using delimiter

Question

I'm trying to parse a list of values for a key using ConfigParser in Python 3.

I saw that it is possible using the JSON library and Python lists in the config file (Lists in ConfigParser):

[sites]
urls = ["https://google.com", "https://yahoo.com", "https://gmail.com"]

Is it possible to set a delimiter instead? Example, using a colon delimiter:

[sites]
urls=https\://google.com:https\://yahoo.com:https\://gmail.com

This needs a regular expression or other more involved solutions. — Michael Butscher, Jul 01 '23 at 22:12
You could use a regex like `(?<!\\):` to split this. ([regex101](https://regex101.com/r/HAUYbp/1)) — Nick ODell, Jul 01 '23 at 22:17

score 0 · Answer 1 · answered Jul 01 '23 at 22:17

0

You could simply split on a separator of your choice applicable for your list of URLs, e.g.:

import configparser

if __name__ == '__main__':
    parser = configparser.ConfigParser()
    parser.read_string("""
    [sites]
    urls=https://google.com;https://yahoo.com;https://gmail.com
    """)

    sites = parser['sites']['urls'].split(';')
    print(sites)  # prints ['https://google.com', 'https://yahoo.com', 'https://gmail.com']

Keep in mind that semicolons might be part of URLs. Therefore, a different separator might be a better choice for you.

answered Jul 01 '23 at 22:17

oschlueter

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This works but does not deal with the backslash escaping for characters that I want to keep. – Vinicius Gonçalves Melo Jul 02 '23 at 17:45
What I wanted was a more Perlish/Linux-style config file (I'm new to Python). – Vinicius Gonçalves Melo Jul 02 '23 at 17:47

Vinicius Gonçalves Melo · Answer 2 · 2023-07-02T18:00:35.403

Based on oschlueter's answer and Nick ODell's comment, the following does the job:

[s.replace('\\','') for s in re.split(r'(?<!\\):', parser['sites']['urls'])]

re.split returns the capture group – the negative lookbehind in this case – so you need to remove it with str.replace.

>>> import re
>>> from configparser import ConfigParser
>>> parser = ConfigParser()
>>> parser.read('config.ini')
['config.ini']
>>> [s.replace('\\','') for s in re.split(r'(?<!\\):', parser['sites']['urls'])]
['https://google.com', 'https://yahoo.com', 'https://gmail.com']

EDIT:

Works with other delimiters too:

urls_at=https://google.com/\@@https://yahoo.com/\@@https://gmail.com/\@
urls_semicolon=https://google.com/\;;https://yahoo.com/\;;https://gmail.com/\;

>>> [s.replace('\\','') for s in re.split(r'(?<!\\);', parser['sites']['urls_semicolon'])]
['https://google.com/;', 'https://yahoo.com/;', 'https://gmail.com/;']
>>> [s.replace('\\','') for s in re.split(r'(?<!\\)@', parser['sites']['urls_at'])]
['https://google.com/@', 'https://yahoo.com/@', 'https://gmail.com/@']

Parsing multiple values for a key with ConfigParser using delimiter

2 Answers2