load_dotenv does not work with variables in values

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
65/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
python
Domain
devops

Research direction

Start by reproducing the issue with the provided .env contents and Python script, then trace load_dotenv's interpolation path. Check how referenced variables are resolved and add coverage for DOMAIN and WORKDIR substitutions; done means the shown ROOT_URL, ADMIN_EMAIL, and LOGDIR values expand as expected.

Written by the indexing model from the issue text.

Description

I have a .env file with this variables similar to those explained in the library README:

# Development settings
DOMAIN=example.org
ADMIN_EMAIL=admin@${DOMAIN}
ROOT_URL=${DOMAIN}/app

# base work directory
WORKDIR=/workdir_shared

# logdir
LOGDIR=${WORKDIR}/logs

When I run this script I see that the values of variables ${DOMAIN} and ${WORKDIR} are not applied. I get:

DOMAIN: example.org
ROOT_URL: ${DOMAIN}/app
ADMIN_EMAIL: admin@${DOMAIN}
WORKDIR: /workdir_shared
LOGDIR: ${WORKDIR}/logs

Whe it should be:

DOMAIN: example.org
ROOT_URL: example.org/app
ADMIN_EMAIL: admin@example.org
WORKDIR: /workdir_shared
LOGDIR: workdir_shared/logs

What can be wrong?

This is the script code:

import os
from dotenv import load_dotenv


load_dotenv(verbose=True, interpolate=True)

print("DOMAIN:", os.getenv("DOMAIN"))
print("ROOT_URL:", os.getenv("ROOT_URL"))
print("ADMIN_EMAIL:", os.getenv("ADMIN_EMAIL"))
print("WORKDIR:", os.getenv("WORKDIR"))
print("LOGDIR:", os.getenv("LOGDIR"))

I tried with "load_dotenv()" with same result.

Dominant language
Python
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