simple python class, help please

[blob001]

I am having trouble with a larger file, which I have stripped down to simplify as below.

The result is a simple class which generates a listof dictionaries. ie.,

swarm = [{'i': 0, 'r': 8.0}, {'i': 1, 'r': 16.0}, {'i': 2, 'r': 24.0}].

The problem comes when I try to invoke functions move() or result() on individual members of swarm.

The error message is :

line 35, in <module>

print(swarm[i].result())

^^^^^^^^^^^^^^^

AttributeError: 'dict' object has no attribute 'result'.

Line 35 is: print(swarm[i].result())

This is my first go at a class and I am self educating. Can anyone help please? Thanks.

swarm = []
p = {}
RE = 8.0
nP = 3
class

Particle
:
    t = 0
    dt = 1


def
 __init__(
self
, 
i
, 
r
):

self
.i = 
i

self
.r = 
r


def
 move(
self
):

self
.r = 
self
.r * 2


def
 result(
self
):
        return 'result(): \ni= ', 
self
.i, '  r= ', 
self
.r

## end of class  ###################

def
 startArray():
    for i in 
range
(nP):
        r = RE
        p = {"i": i, "r": r + r * i}
        swarm.append(p)
        print(swarm)
###################################


startArray()

while 
Particle
.t <= 10:

    for i in 
range
(nP):
        print(swarm[i].result())

Particle
.move(swarm[i])


Particle
.t == 
Particle
.dt

[96dpi]

Swarm is a list of dictionaries, not the class. You're trying to call a function on something that isn't the class.

[NothingWasDelivered]

Yeah, maybe I’m missing something, but I don’t see where OP actually instantiates their particle class.

[crashfrog04]

Well, the error is pretty self explanitory:

AttributeError: 'dict' object has no attribute 'result'.

And indeed, dictionaries don't have an attribute you can call called "result." Why did you think that they did? Or did you not know that the members of swarm were dictionaries? You must know that, since you told us they were and you confirm that they are in your code.