Can property getters and setters have additional arguments?

[pjfarley3]

I am trying to implement getters and setters in a class using a numpy array as the base instance value, but I am not able to pass an array index argument to the getter function (and probably not to the setter function, but it never gets that far).

The code is as follows:

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import numpy as np   class Matrix:     def __init__(self, msize):         self.msize = msize         self.mvalues = np.full([msize + 2, msize + 2, msize + 2], -1,                                dtype=np.int32)         self.mvalues[1:-1, 1:-1, 1:-1] = 0         self.visited = np.zeros([msize + 2, msize + 2, msize + 2],                                 dtype=np.int32)       @property     def visits(self, coord):         return self.visited[coord[0], coord[1], coord[2]]       @visits.setter     def incr_visits(self, coord, incr):         self.visited[coord[0], coord[1], coord[2]] += incr     def Coord(x, y, z):     return np.full([3,], (x, y, z), dtype=np.int32)   mycoord = Coord(1, 2, 3) print("mycoord={}".format(mycoord))   mygal = Matrix(10) print("Before set:{}".format(mygal.visits(mycoord)))   mygal.incr_visits(mycoord, 10) print("After  set:{}".format(mygal.visits(mycoord)))

And this is the output I get:

Output:
mycoord=[1 2 3]
Traceback (most recent call last):
  File "C:\Users\MyUser\Test\clstest4.py", line 28, in <module>
    print("Before set:{}".format(mygal.visits(mycoord)))
TypeError: visits() missing 1 required positional argument: 'coord'

Please tell me what I am doing wrong here.

Peter

[Askic]

Not sure what are you trying to achieve, but please execute the following code:

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import numpy as np     class Matrix:     def __init__(self, msize):         self.msize = msize         self.mvalues = np.full([msize + 2, msize + 2, msize + 2], -1,                                dtype=np.int32)         self.mvalues[1:-1, 1:-1, 1:-1] = 0         self.visited = np.zeros([msize + 2, msize + 2, msize + 2],                                 dtype=np.int32)       @property     def visits(self, coord):         return self.visited[coord[0], coord[1], coord[2]]       @visits.setter     def incr_visits(self, coord, incr):         self.visited[coord[0], coord[1], coord[2]] += incr     def Coord(x, y, z):     return np.full([3, ], (x, y, z), dtype=np.int32)     mycoord = Coord(1, 2, 3) print("mycoord={}".format(mycoord)) mygal = Matrix(10) print('This is what is created inside Matrix object: ') print(type(mygal.visited)) print(mygal.visited) print('This is how mycoord looks like: ') print(type(mycoord)) print(mycoord)

Attribute visited is very strange to me.

[pjfarley3]

I added your code and reduced the Matrix size from 10 to to 3 so output would be shorter. Below is the output.

The arrays in the class and the Coord() value are NUMPY arrays, not regular python arrays.

My question is still whether I am off-base in thinking that property methods and getter/setters can take additional positional parameters as in my example.

Peter

Output:
mycoord=[1 2 3]
This is what is created inside Matrix object:
<class 'numpy.ndarray'>
[[[0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]]

 [[0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]]

 [[0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]]

 [[0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]]

 [[0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]
  [0 0 0 0 0]]]
This is how mycoord looks like:
<class 'numpy.ndarray'>
[1 2 3]