creating a line of objects

To create a series of objects along a line, we modify the calc_midpoint function to accept a variable that allows us to scale the difference, this way we can place each object by a percentage offset along the line. The line in this demo is the path between the Camera and Lamp.

import bpy, math
from mathutils import Vector

def calc_midpoint( a, b, m ):
    a = Vector(a)
    b = Vector(b)
    dif = b-a
    return a + (dif*m)

x = bpy.data.objects['Camera'].location
y = bpy.data.objects['Lamp'].location

for i in range(10):
 middle = calc_midpoint(x,y, i*0.1)
 bpy.ops.mesh.primitive_monkey_add(location=middle)
 monkey = bpy.context.object
 monkey.scale*=math.sin(i*0.5)