Get LINUX env variable with python -

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i have ~/.bashrc file:

path=$path:/usr/pgsql-9.3/bin/  db_user=postgres db_password=password db_host=localhost

when i'm doing os.environ['path'] :

/usr/local/sbin

but when i'm doing os.environ['db_user'] get: 

keyerror: 'db_user'

how need declare vars correctly python, cause echo in shell :

echo $db_user     >>> postgres

thanx

you haven't exported variables:

export db_user=postgres export db_password=password export db_host=localhost

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