function that run once for all objects

[deanhystad]

I think you are asking if there is a way to automatically call a method ONLY for the first instance of a class. There is no such thing, but it is something you could write using a a class method to keep track

class Alpha():
	first = True

	def __init__(self):
		if self.__class__.first:
			print("I am first", self)
			self.__class__.first = False
		else:
			# Do not first stuff
			print("I am not", self)

[Alpha() for _ in range(3)]

.

If I am totally off base on my interpretation, write the python code to do what you want to do. Even if it doesn't work it is a good way to describe what you are thinking.