求助：无法通过pip安装Django 2.0.2的问题

Hey there, let's work through why you're hitting this installation error!

First, let's recap the error you're seeing:

Could not find a version that satisfies the requirement Django==2.0 (from versions: 1.1.3, 1.1.4, 1.2, 1.2.1, 1.2.2, 1.2.3, 1.2.4, 1.2.5, 1.2.6, 1.2.7, 1.3, 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5, 1.3.6, 1.3.7, 1.4, 1.4.1, 1.4.2, 1.4.3, 1.4.4, 1.4.5, 1.4.6, 1.4.7, 1.4.8...)

This almost always comes down to one of two key issues—let's fix them step by step:

Step 1: Check Your Python Version #

Django 2.0.2 has strict Python compatibility rules: it only works with Python 3.4, 3.5, or 3.6. If you're still using Python 2.x, or a Python 3 version older than 3.4, pip will only show you Django versions that are compatible with your outdated Python setup.

Check your current Python version with this command:

python --version
# Or for Python 3 specifically:
python3 --version

If you're on an unsupported version, you'll need to upgrade Python first before installing Django 2.0.2.

Step 2: Upgrade Your Pip Version #

Older versions of pip often can't recognize newer package releases on PyPI. That's probably why it's only listing those old Django versions! Update pip to the latest version using:

# For Python 2 environments
pip install --upgrade pip
# For Python 3 environments
pip3 install --upgrade pip

Step 3: Reinstall Django 2.0.2 #

Once pip is updated, try running your install command again:

pip install Django==2.0.2
# Or use pip3 if you're targeting Python 3:
pip3 install Django==2.0.2

Step 4: Verify the Installation #

After the install finishes, double-check it worked by running:

python -m django --version
# Or
python3 -m django --version

You should see 2.0.2 printed out if everything went right!

内容的提问来源于stack exchange，提问作者Snipper03