GoF design pattern with Python

builder.py

# -*- coding:utf-8 -*-

"""
@author: Diogenes Augusto Fernandes Herminio <[email protected]>
https://gist.github.com/420905#file_builder_python.py
"""

class Director(object):
	def __init__(self):
		self.buider = None

	def construct_building(self):
		self.builder.new_building()
		self.builder.build_floor()
		self.builder.build_size()

	def get_building(self):
		return self.builder.building

# Abstract Builder
class Builder(object):
	def __init__(self):
		self.building = None

	def new_building(self):
		self.building = Building()

# Concrete Builder
class BuilderHouse(Builder):
	def build_floor(self):
		self.building.floor = 'One'

	def build_size(self):
		self.building.size = 'Big'

class BuilderFlat(Builder):
	def build_floor(self):
		self.building.floor = 'More than One'

	def build_size(self):
		self.building.size = 'Small'

# Product
class Building(object):
	def __init__(self):
		self.floor = None
		self.size = None

	def __repr__(self):
		return 'Floor: {0.floor} | Size: {0.size}'.format(self)

# Client
if __name__ == "__main__":
	director = Director()
	director.builder = BuilderHouse()
	director.construct_building()
	building = director.get_building()
	print(building)
	director.builder = BuilderFlat()
	director.construct_building()
	building = director.get_building()
	print(building)

Hey you have a Typo at line 10 (buider is builder for sure) and for your Abstract builder use ABCMeta as Metaclass like this

from abc import ABCMeta

class Builder(metaclass=ABCMeta):
	def __init__(self):
		self.building = None

	def new_building(self):
self.building = Building()