Changing Hair Count on Multiple Objects

Hello, I can’t figure out how to change hair settings on all selected objects. This code does not work.

for obj in bpy.context.scene.objects:
obj.select_set(True) = 500

I found this code in these forums that works on a list of objects and as it goes through the list makes each object an active object.

context = bpy.context
yourObjects = [o for o in context.selected_objects if o.type == ‘MESH’]

for o in yourObjects:
o.select_set(True) # Select the object = o # Set the object as the active object
#Your actions to run per object.