python - Taking only 1 on 3 <tr> -

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i'm parsing website extract data in python using xpaths.

but don't know how thing :

<tr> </tr> <tr> </tr> <tr> data </tr> <tr> </tr> <tr> </tr> <tr> data </tr> <tr> </tr> <tr> </tr> <tr> data </tr>

i know can //tr[3] thrid one. how can thirds ?

use position funxtion , take remainder of division 3. because xpath understand 0 false, can write

//tr[not(position() mod 3)]

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