When working with Python projects that require environment variable management, you might encounter an unexpected error during installation. The root cause often surprises developers: a simple typo in the package name.

The Installation Error

Attempting to install what appears to be the correct package:

pip install dotenv

Results in a confusing failure:

error: subprocess-exited-with-error
× pip subprocess to install backend dependencies did not run successfully.

The error trace points to dependency resolution issues with the distribute package, showing an AttributeError related to importlib._bootstrap:

AttributeError: module 'importlib._bootstrap' has no attribute 'SourceFileLoader'

Why This Happens

The package named dotenv on PyPI is an outdated, unmaintained package that conflicts with modern Python versions. It hasn't been updated to work with current Python releases, causing these cryptic installation failures.

The Solution

The correct package name is python-dotenv. This is the maintained, widely-used library for loading environment variables from .env files.

pip install python-dotenv

After installation, import it in your code:

from dotenv import load_dotenv

Common Troubleshooting Steps That Won't Help

Before discovering the actual issue, you might have tried:

# Upgrade pip
python -m pip install --upgrade pip

# Rebuild virtual environment
rm -rf venv
python -m venv venv
source venv/bin/activate

# Clear pip cache
pip cache purge

None of these address the core problem because the issue lies with the package name itself, not with pip configuration or environment setup.

Usage Example

After installing python-dotenv, load your environment variables:

import os
from dotenv import load_dotenv

# Load variables from .env file
load_dotenv()

# Access variables
api_key = os.getenv('OPENAI_API_KEY')

The .env file in your project root:

OPENAI_API_KEY=your-api-key-here

Key Takeaway

When installing packages, always verify the exact package name on PyPI. The PyPI page will show you the correct pip install command, including the proper package name with any prefixes like python-.