Blender Sushi Script to randomize the Scale Transform of user selected mesh. It randomize the Scale in 3 different axes separately.

jgbpy_randomizeScaleSelectedObject.py

import bpy
import random


# Define a function to randomize scale

def randomizeScale (minScale, maxScale):

    selected_objects = bpy.context.selected_objects

    for object in selected_objects:
        randX = random.uniform (minScale, maxScale)
        randY = random.uniform (minScale, maxScale)
        randZ = random.uniform (minScale, maxScale)

        object.scale = (randX, randY, randZ)


# Example how you would run the function and giving it required arguments
# which is the two value minScale and maxScale


randomizeScale(0.3, 2)