Index of example files and classes:
/adapter payment_portal.py -class PaymentAdapter -class SamanPortal -class ShaparakPortal -class SamanPortalAdapter -class ShaparakPortalAdapter
/factory_method factory_method.py -class Product -class Book -class Laptop -class ProductFactory sms_factory.py -class AbstractSMSService -class Service1 -class Service2 -class SMSFactory
/singleton redis_singleton.py -class Redis singleton.py -class DB
/strategy data_storage.py -class DataStorageStrategy -class MemoryStore -class DiskStore
/template font.py -class AbstractFont -class VazirFont -class LalezarFont
facade.py -class Product -class Book -class Laptop -class ProductMaker
prototype.py -class Product -class Laptop -class Lamp -class ProductCache