无法安装django-constance，遇SSL证书验证及版本匹配错误

Looks like you're hitting a common issue with outdated pip versions not supporting modern TLS protocols. PyPI stopped accepting connections using TLSv1.0 and TLSv1.1 a while ago, which is why your install is failing with that SSL alert. Here's how to fix it:

Solution 1: Upgrade Pip First (Recommended) #

The best long-term fix is to update your pip to a version that supports TLS 1.2+. Run this command:

pip3 install --upgrade pip

If this command also throws the same SSL error (since your current pip can't connect to PyPI securely), you can download the official get-pip.py script from the pip project's official sources, then run it with Python 3:

python3 get-pip.py

This will install the latest version of pip that supports modern TLS protocols. Once pip is updated, try installing django-constance again with pip3 install django-constance—it should work without issues.

Solution 2: Bypass SSL Verification Temporarily #

If you can't upgrade pip right now, you can tell pip to trust PyPI's hosts during the install. This skips SSL verification for the package download:

pip3 install django-constance --trusted-host pypi.org --trusted-host files.pythonhosted.org

Note: This is a temporary workaround. Upgrading pip is still better for security and future package installs.

Why This Happens #

Older versions of pip (prior to 9.0.1) don't support the TLS 1.2 protocol required by PyPI's current security standards. The error message [SSL: TLSV1_ALERT_PROTOCOL_VERSION] is PyPI's way of letting you know your connection is using an outdated, insecure protocol that's no longer allowed.

内容的提问来源于stack exchange，提问作者sof-03