Explanation

Python3 before the 3.1 release creates a binary name python3.0 instead of the more commonpython3 which every other version uses. I know with 3.0.x being EOL for more than 16 years this probably won't be a common occurrence. But I'm currently working on a archiving project that requires some truly old historic versions and this tool really helped building those CPython versions from source (thanks for that 🎉).

Here is a screenshot of the output from a 3.0.1 build and the binaries produced (please ignore the empty block in the middle I did the cd calls with a lot of intermittent steps and so removed it for readability):

Considerations

1. I don't have access to a Windows PC right now so I only implemented that fix for Unix platforms (but I don't think it will apply for Windows since the naming seems to be completely different).
2. Should I add some tests for this behavior?

How I build it

I'm certain you already have well working developing setup but I fell into some pitfalls (like installing python2), so here is the docker file I used for completeness. It fails without before this PR and works with the changes.

FROM ubuntu:22.04

ENV DEBIAN_FRONTEND=noninteractive

# Install build dependencies and curl for uv
RUN apt-get update && apt-get install -y build-essential gdb lcov pkg-config \
    libbz2-dev libffi-dev libgdbm-dev libgdbm-compat-dev liblzma-dev \
    libncurses5-dev libreadline6-dev libsqlite3-dev libssl-dev \
    lzma lzma-dev tk-dev uuid-dev zlib1g-dev libzstd-dev \
    inetutils-inetd curl git python2.7

# Create a link to call python2 with `python` which is the name the build script for early Python3 versions require it.
RUN ln -s /usr/bin/python2.7 /usr/bin/python

# Install uv
RUN curl -LsSf https://astral.sh/uv/install.sh | sh
ENV PATH="/root/.local/bin:$PATH"

COPY . . 
RUN uv run every-python install v3.0.1
RUN uv run -- every-python run v3.0.1 -- python --version

CMD ["/bin/bash"]