__init__ question

[Moshe Zadka]

[Adrian Eyre, in response to the following challenge:

a = Vector()  # x=0 y=0 z=0
a = Vector( 1)  # x=1 y=1 z=1
a = Vector( 1, 2, 3)  # x=1 y=2 z=3]

How about:
 
>>> class Vector:
...  def __init__(self, *args):
...   print args
...
>>> v=Vector()
()
>>> v=Vector(1)
(1,)
>>> v=Vector(1,2)
(1, 2)


The only problem with this solution is that you have to parse
args yourself (raising TypeErrors for wrong number of args, etc.),
and having no keyword arguments, as in

Vector(z=5) # x=0, y=0

A quicker, easier and more intuitive solution is:

class Vector:

	def __init__(self, x=0, y=0, z=0):
		self.x, self.y, self.z = x, y, z


all examples from the original post, plus my own, work with the added
benefit Python does all argument parsing for us.