[Python] Why does "pip list" not like pipes on the bash command line?

I'm using a bash terminal.

I just wanted to peek at the first few names of installed python packages:

pip list | head -n5


And got an error message:

Package Version
------------------ ----------------
attrs 21.2.0
Automat 20.2.0
Babel 2.8.0
ERROR: Pipe to stdout was broken
Exception ignored in: <_io.TextIOWrapper name='<stdout>' mode='w' encoding='utf-8'>
BrokenPipeError: [Errno 32] Broken pipe


Is something broken? If I'm going to capture that information programmatically, I definitely don't want an error message included.

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