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IMO this PR doesn't get any improve on the documentation. python -mtimeit work successfully.

I noticed that it works before submitting the PR, but it seems odd to me. Just like this works, python -c"print('Hi')", but it definitely seems strange when there isn't a space between the arg and what's being passed to it, like: python -c "print('hello')". Also, I tried pip and it works with same way -- with pip install -rrequirements.txt behaving exactly like pip install -r requirements.txt). This behavior seems puzzling.

Think of *nix commands. For example, rm. When you want to pass several args at once, you can either list them separately (e.g. rm -f -i myfile.py) or concatenate them together (e.g. rm -fi myfile.py), but rm fails if you were to call the command without a space between the argument(s) and the file to be removed (e.g.rm -fimyfile.py).

It's not really clear why this command line behavior in python would be intentional. Even though it currently works as is, it's not obvious as to why this is (or should be) the case.

I created an issue for this.

I believe the consistence by itself already is a good argument for the PR. @jgors as Ned wrote at the issue, have you seen other cases that needs update?

Thanks, @jgors. This was already fixed here #18853