How to use Jenkins Environment variables in python script

That's what you need if I understand you correctly:

QUALIFIER="$(echo $BUILD_ID | sed "s/[-_]//g" | cut -c1-12)"
export QUALIFIER
python my_script.py

And in your Python script:

import os
qualifier = os.environ['QUALIFIER']

or without the shell part:

import os
import re
qualifier = re.sub(r'[-_]+', '', os.environ['BUILD_ID'])[0:12]

import os

os.environ.get("variable_name")

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