is there any shorthand method of defining multiple objects of the same class in one line. (I'm not talking about lists or array of objects)..
i mean something like
p1,p2,p3 = Point()
any suggestions?
-
What would that mean? Can you provide some explanation of what you think that should do?S.Lott– S.Lott2011-08-01 20:06:06 +00:00Commented Aug 1, 2011 at 20:06
Add a comment
|
4 Answers
It may be slightly more efficient to use a generator comprehension rather than a list comprehension:
p1, p2, p3 = (Point() for _ in range(3)) # use xrange() in versions of Python where range() does not return an iterator for more efficiency
There's also the simple solution of
p1, p2, p3 = Point(), Point(), Point()
Which takes advantage of implicit tuple packing and unpacking.
1 Comment
Rushil Paul
ya this was exactly what I wanted..thnx
Not really.
p1, p2, p3 = [Point() for x in range(3)]
answered Aug 1, 2011 at 19:52
Ignacio Vazquez-Abrams
804k160 gold badges1.4k silver badges1.4k bronze badges
Comments
What exactly are you trying to achieve?
This code does what you're asking, but I don't know if this is your final goal:
p1, p2, p3 = [Point() for _ in range(3)]
Comments
Think map is also acceptable here:
p1, p2, p3 = map(lambda x: Point(), xrange(3))
But generator expression seems to be a bit faster:
p1, p2, p3 = (Point() for x in xrange(3))
4 Comments
JAB
That's a generator comprehension, not a list comprehension.
SingleNegationElimination
@JAB: that's generator expression, not generator comprehension
JAB
@TokenMacGuy: Considering the syntax usage elsewhere in the document, "generator comprehension" can simply be taken to mean "comprehension wrapped as a generator" rather than "as a list" or "as a dict". After all, what most people refer to as "list comprehensions" are actually "(list )comprehensions contained within list displays", as shown in the link you provided.
Artsiom Rudzenka
Thank you guys - i have modified my post.