You are absolutely right, the functionality is there, but the idea is to make 
it easily available from the command line.

Here is a line (with shortened URL) from a Dockerfile which installs poetry as 
suggested in the docs:

    RUN python -c "from urllib.request import urlopen; 
print(urlopen('https://.../install-poetry.py').read().decode())" | python

With the proposed functionality, the urllib could provide a download entry 
point which would make the line look like this:

    RUN python -m urrlib.download "https://.../install-poetry.py"; | python

This is less error-prone, would also work for rather large downloads and 
wouldn't be much effort to implement/test/maintain.
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