Heroku推送失败：指定Python 2.7.14仍提示版本不支持

Hey there, let's work through this frustrating deployment issue you're hitting. I've helped a few folks with similar problems when dealing with older Python versions on Heroku, so here are the most likely fixes to try:

1. Double-Check Your runtime.txt Format #

Heroku is super strict about the formatting in runtime.txt—even a tiny mistake can cause it to reject your specified version. Make sure the file contains exactly this line, no extra spaces, no capitalization:

python-2.7.14

I’ve seen plenty of cases where users write 2.7.14 or Python 2.7.14 instead, which breaks the version detection entirely.

2. Verify Your Pipfile Configuration #

In your Pipfile, ensure the [requires] section uses the correct syntax for Python 2.7. While you can specify a patch version, Heroku’s Pipenv support sometimes prioritizes the major/minor version first. Try setting it to:

[requires]
python_version = "2.7"

If you still get the error, lock to the exact version in your Pipfile.lock by running pipenv lock --python 2.7.14 locally. This generates a lockfile that explicitly references 2.7.14—push this file along with your code to ensure Heroku picks up the right version.

3. Switch to a Heroku Stack That Supports Python 2.7 #

Newer Heroku stacks (like heroku-22 or heroku-24) no longer include support for Python 2.7, since it’s reached end-of-life. You’ll need to switch to an older stack that still supports it, like heroku-18:

heroku stack:set heroku-18

After running this command, push your code again—this stack has the necessary system libraries to run Python 2.7 without issues.

4. Confirm the Official Python Buildpack is Active #

Sometimes third-party buildpacks or misconfigured build settings can interfere with version detection. Make sure you’re using Heroku’s official Python buildpack with this command:

heroku buildpacks:set heroku/python

A Quick Heads-Up #

Just to be clear: Python 2.7 has been completely unsupported since 2020, meaning no security updates or bug fixes. Even if you get this deployment working, you’ll want to plan an upgrade to Python 3 as soon as possible to keep your app secure and maintainable.

内容的提问来源于stack exchange，提问作者Stephanie