python: fix typo

[chuanconggao]

No description provided.

[waldyrious]

👍

[felixonmars]

AFAIK -O does little "optimizations" besides skipping asserts. I don't see it as a really useful use case that belongs here.

[chuanconggao]

Skipping asserts is quite important for certain scripts, as that could take significant amount of time.

Also for PyPy, the -O option does have some affect on the performance.

[igorshubovych]

Contriubuting Guidelines:

2nd. When in doubt, keep new command-line users in mind. Err on the side of clarity rather than terseness.

I think -o is for advanced users.

[igorshubovych]

@chuanconggao can you please split this PR into 2 parts: fixing typo and -O. The reason I am asking for this: typo can be merged without any discussions.

[igorshubovych]

Thank you!