[Closed] checking for a condition

hello, this is probably a noob question so here goes.

I’m writing a script that would change the diffuse maps of materials, so I’m checking to see if the material type is standard material so I wrote

if classof (o.material) == standardMaterial() then 

the o is for the loop, obviously there’s something wrong, the code runs with no errors but it does nothing, I suspect that the condition is not met so I’d like to know how to rectify this.

thanks in advance.