[Python] Difference between `python3-ipython` and `ipython3` packages in Ubuntu 20.04

While querying on Ubuntu 20.04 for an ipython package (tried pip3 install ipython first, but that didn't give me the ipython3 binary I was looking for) I found there are two packages:

$ ~/dev/romanyh$ sudo apt search ipython3
Sorting... Done
Full Text Search... Done
ipython3/focal,focal,now 7.13.0-1 all [installed]
Enhanced interactive Python 3 shell

python3-ipython/focal,focal,now 7.13.0-1 all [installed]
Enhanced interactive Python shell (Python 3 version)


I first tried python3-ipython because others (e.g., pip and venv) follow this naming convention, but it didn't give me the ipython3 binary I was looking for. It seems the effect was similar to running pip3 install ipython.

I ended up installing both, the ipython3 package did get me the binary I was looking for.

My question is: What is the difference between these packages? Why are both of them available?

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