Using Python to randomly offset vertices of a cube

randomly_offset_vertices_of_a_cube.py

# give Python access to Blender's functionality
import bpy

# extend Python functionality to generate random numbers
import random

# add a cube into the scene
bpy.ops.mesh.primitive_cube_add(size=2)
obj = bpy.context.active_object

# randomly offset vertices
for vertex in obj.data.vertices:
    vertex.co.x += random.uniform(-1, 1)
    vertex.co.y += random.uniform(-1, 1)
    vertex.co.z += random.uniform(-1, 1)