Create class instance in python from list as attributes

Question

So I have an object:

class Particle(object):
    def __init__(self, x, y, vx, vy, ax, ay):
        self._x = int(x)
        self._y = int(y)
        self._vx = int(vx)
        self._vy = int(vy)
        self._ax = int(ax)
        self._ay = int(ay)
        # ...

I want to create an instance of that object from a list of numbers. How would I do that? Particle(list) doesn't work because it only inputs a list, not each value in the list. Thanks so much, I am sure there is a very obvious answer.

Vincent Savard · Accepted Answer · 2011-11-18 04:04:17Z

3

Precede your list name by a star:

def foo(a, b, c):
    print(a, b, c)

a = [1,2,3]
foo(*a)
# 1 2 3

The star unpacks the list, which gives 3 separate values.

edited Nov 18, 2011 at 4:04

answered Nov 18, 2011 at 3:50

Vincent Savard

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1 Comment

saul.shanabrook Over a year ago

Thanks so much! I knew there was a simple way to do what i wanted!

Raymond Hettinger · Accepted Answer · 2011-11-18 03:52:59Z

2

What you need is called "unpacking argument lists". Here's an example taken from the tutorial:

>>> range(3, 6)             # normal call with separate arguments
[3, 4, 5]
>>> args = [3, 6]
>>> range(*args)            # call with arguments unpacked from a list
[3, 4, 5]

answered Nov 18, 2011 at 3:52

Raymond Hettinger

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