Generating irregular stairs in Maya

stone_stairs.py

"""Little PyMEL script for generating irregular or worn out stairs.
Needs a curve that defines the profile of each step and a bunch of curves to extrude the profile on.
"""

# Import PyMEL and random modules
import pymel.core as pmc
import random

# Select the profile curve and then run this command
profile = pmc.ls(sl=True)[0]

# Select the extrude curves and then run this command
sides = pmc.ls(sl=True)

for i in range(10):
    # Select a random extrude curve
    next_side = random.choice(sides)
    # Occasionally mirror it on the X axis to add some variance
    next_side.setScale([random.choice([-1,1]),1,1])

    # Select the profile and the extrude curve
    pmc.select([profile, next_side])
    # Extrude and call the result 'step'
    step = pmc.extrude(n=‘step’)[0]

    # Move the freshly generated step to its place
    step.setTranslation([0,2*i,2*i])