Problem: Old Python can't install (requires-python) —— Trove problem library

What you will run into

On old Python versions like 3.8, pip install deepcode-hku reports no matching version found. The package is fine; your Python is too old.

Why this happens

The package requires Python >= 3.10 (newer dependencies like pydantic 2.x don't support 3.8); after pip filters by requires-python, no available version exists for your interpreter.

pip's error is misleading: "No matching distribution" looks like "the package does not exist", but it is actually the version filter dropping every candidate.

During resolution, pip reads each release's requires-python metadata and compares it with the current interpreter; releases that do not satisfy it never enter the candidate set, and when all candidates are filtered out, pip reports "no matching version".

The package is fine on PyPI — your interpreter is just not in the supported list.

So the first step for this error is always python3 --version to confirm your own version, not to suspect a typo in the package name.

Step by step

1. Confirm the Python version — Required

python3 --version

2. Upgrade to 3.10+ — Required

Use pyenv/conda for multi-version coexistence; don't touch the system default Python (to avoid breaking system tool dependencies).

3. Reinstall — Required

pip install deepcode-hku

How to confirm it works

Install succeeds (measured output shape):

pip install deepcode-hku
-> Successfully installed deepcode-hku (measured on Python 3.14.4)

deepcode --version (or the equivalent command) prints a version normally.

Other environments

Symptom

pip install deepcode-hku on old versions like Python 3.8 reports no matching version found.

Cause

The package requires Python >= 3.10 (newer dependencies like pydantic 2.x don't support 3.8); after pip filters by requires-python, no available version exists.

Solution

1. Upgrade Python to 3.10+ (3.14.4 measured working in this marketplace).
2. Use pyenv/conda for multi-version coexistence; don't touch the system default.