Off topic:How To Process Array In Python As In R

Question

[cutin]

Dear all,

I have an array, namely A, (m rows and n columns), I would like to calculate "sum of a column if criteria in other columns"

Example: sum of the 2nd column and criteria in the first column

In R:

sum(A[A[, 1] < h, 2])

How I can do it in python without loops?

Thanks,