Classについて

staticmethodとclassmethodの違い #

# instantce method - self is passed

 def get_years_from_release(self):
 	return datetime.datetime.now().year - int(self.release_year)

movie = Movie("Rambo", "1982")
print(f"The movie {movie.name} is {movie.get_years_from_release()} years old.")

# staticmethod - self is not passed

@staticmethod  # 'self' is not passed to this method
def get_years_from_release(release_year):
	return datetime.datetime.now().year - int(release_year)
    
movie = Movie("Rambo", "1982")
print(f"The movie {movie.name} is {movie.get_years_from_release(movie.release_year)} years old.")

Class Methods receive a class as first argument. Instance methods receive a class instance as first argument.

Instance methods: receive an instance as first argument(self) Class methods: receive a class as first argument (cls) Static methods: do not receive any special arguments.