I'm not familiar with Pandas but I'm guessing that its API is similar in style to numpy just by looking at the code snippet. I can't rule out that you might be

I'm not familiar with Pandas but I'm guessing that its API is similar in style to numpy just by looking at the code snippet. I can't rule out that you might be an idiot, but it is not because you find that line of code confusing. The numpy API is horrific. Its abuse of operator overloading and undermining of expectations is shockingly awful. They should have just made a separate query language.