Topics
The Factory Pattern is about generating objects. You implement the Factory by declaring an interface and the caller (your code where you want to use the objects) uses this interface to get the data but is not aware of where the data is coming from. This allows us to abstract/decouple object creation.
class FrenchLocalizer:
def __init__(self):
self.translations = {"car": "voiture", "bike": "bicyclette",
"cycle":"cyclette"}
def localize(self, msg):
"""change the message using translations"""
return self.translations.get(msg, msg)
class SpanishLocalizer:
def __init__(self):
self.translations = {"car": "coche", "bike": "bicicleta",
"cycle":"ciclo"}
def localize(self, msg):
"""change the message using translations"""
return self.translations.get(msg, msg)
class EnglishLocalizer:
def localize(self, msg):
return msg
def Factory(language ="English"):
"""Factory Method"""
localizers = {
"French": FrenchLocalizer,
"English": EnglishLocalizer,
"Spanish": SpanishLocalizer,
}
return localizers[language]()
if __name__ == "__main__":
f = Factory("French")
e = Factory("English")
s = Factory("Spanish")
message = ["car", "bike", "cycle"]
for msg in message:
print(f.localize(msg))
print(e.localize(msg))
print(s.localize(msg))We can easily add new localizers without disturbing the existing client code.