Distribute objects in a circle with Blender Python

circle.py

import bpy

from math import radians, sin, cos

z = 0.5
theta = radians(360)  # 2 PI
columns = 60
alpha = theta / columns

# The radius of a circle is the distance from the center of the circle to any point on it's 
# circumference. It is usually denoted by 'R' or 'r'.
for r in range(2, 10, 2):
    for a in range(columns):
        angle = a * alpha
        x = r * cos(angle)
        y = r * sin(angle)
        
        bpy.ops.mesh.primitive_cube_add(location=(x, y, z))
        cube = bpy.context.active_object
        cube.rotation_euler.z = angle        
        cube.scale = (0.3, 0.05, 0.8)