How to transmit a parameter to a function called in an other function?

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Here are 2 functions: the second one calls the first one but obviously it doesn't transmit the value of sw to the first and I have an error of execution. So how should I do to obtain that sw be transmitted to pos_rat(x, y, sw) by ratio_for_pivot(x, y, sw)?

 def pos_rat(x, y, sw):
    if y > 0:
        return x/y
    else:
        if sw == 1:
            return "-"
        elif sw == 2:
            return -100000

def ratio_for_pivot(mat, var_ent, sw):
    return [pos_rat(mat[i][mat.ncols() - 1], mat[i][var_ent], sw)
            for i in range(mat.nrows() - 1)]