Python: Can't copy pygame surface objects

Question

I have a class:

class personInfo:
    def __init__(self,name,age,height,hairColour,face):
        self.name = name
        self.age = age
        self.height = height 
        self.hairColour = hairColour
        self.face = face

I have several images here that I load in using the pygame module.

yellowFace = pygame.image.load("happy.png")
blueFace = pygame.image.load("sad.png")
redFace = pygame.image.load("angry.png")

I created an array that holds instances of that class. Here I am populating it.

personArray = []
while len(array) != 10:
    personArray.append(personClass("John",32,6,"Blond",yellowFace))

I would like to store the actual variables of that class (name, age height,hairColour, etc) in a variable I will call "personStorage". However, I can't have that var be mutatable since I need to access that var's values and change them. Doing this can't change the values of any instances inside the personArray. How would I do this?

EDIT: I also can't seem to be able to Copy this class because I get a type error that says: "can't pickle pygame.surface objects" since I have a value of a surface object within that class.

Do you mean something like personStorage = ("John", 32, 6, "Brown"); personClass(*personStorage)? — chepner
– chepner, Commented Apr 9, 2019 at 16:31
It would be more like personStorage = personArray[2] which would give me the values of what that specific instance has so I can then change them. For example I could do personStorage.name = "Rick" for example. The problem I have is that personArray[2]'s name var is changed to "Rick", instead of the default value of "John" — Hydra
– Hydra, Commented Apr 9, 2019 at 16:33
So you basically need a copy of the personInfo instance, not just a reference to it? Implement personInfo.__copy__ as described by the copy module, then use personStorage = copy.copy(personArray[2]). (deepcopy might be necessary, depending on your circumstances.) — chepner
– chepner, Commented Apr 9, 2019 at 16:41
Yes, that's essentially what I need. Then I would like to change a particular instance in the array. For example personArray[2] = personStorage. Just as an example. — Hydra
– Hydra, Commented Apr 9, 2019 at 16:44
If you are going to assign the modified copy back to the same slot, why not just modify the original in-place? I'm just trying to be clear about what it is you actually need. — chepner
– chepner, Commented Apr 9, 2019 at 16:44

A.N. O'Nyme · Accepted Answer · 2019-04-09 16:42:43Z

1

If I understood what you're trying to do :

class PersonInfo:
    def __init__(self,name,age,height,hairColour):
        self.name = name
        self.age = age
        self.height = height 
        self.hairColour = hairColour
    def toList(self):
        return [self.name, self.age, self.height, self.hairColour]

By the way, class names' first letter is always uppercase.

EDIT : To achieve what you're trying to do :

    old = PersonInfo("old", 1, 2, "blue")
    new = PersonInfo(*old.toList())
    new.name = "new"
    print(old.name) #'old'

edited Apr 9, 2019 at 16:42

answered Apr 9, 2019 at 16:34

A.N. O'Nyme

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3 Comments

Hydra Over a year ago

That's not exactly what I meant. I meant creating an entirely new var that I could change, however, it's vars would be accessed from a particular instance in the class array. For example, personStorage = personArray[2]. I want to change the values that personStorage has without changing the values of personArray.

A.N. O'Nyme Over a year ago

OK ! I edited my answer so it matches what you're trying to do.

Hydra Over a year ago

What if I have a pygame surface object value in that class? I edited the original question to match this problem. Because using this method I am getting a TypeError that says: "can't pickle pygame.Surface objects"

filipe · Accepted Answer · 2019-04-09 17:02:43Z

0

Use the copy module:

The function copy() shallow copy operation on arbitrary Python objects.

import copy


class PersonInfo:
    def __init__(self, name, age, height, hair_colour):
        self.name = name
        self.age = age
        self.height = height
        self.hairColour = hair_colour


personArray = []
for x in range(20, 24):
    personArray.append(PersonInfo("John", x, 6, "Brown"))


personStorage = copy.copy(personArray[2])
personStorage.name = "Ana"

print("\rpersonArray[2].name is %s\n"
      "\rpersonStorage.name is %s"
      % (personArray[2].name, personStorage.name))

edited Apr 9, 2019 at 17:02

answered Apr 9, 2019 at 16:49

filipe

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Comments

KetZoomer · Accepted Answer · 2021-10-25 03:19:16Z

0

I have created setters and getters to get the data.Also you can create a copy of the instance that holds the data.

from copy import deepcopy
class PersonInfo:
    def __init__(self,name,age,height,hairColour):
        self.name = name
        self.age = age
        self.height = height 
        self.hairColour = hairColour

x = PersonInfo("Mario",34,1.70,"blue")

print(x.height)  # prints 1.70

x1 = deepcopy(x)

print(x1.age)

edited Oct 25, 2021 at 3:19

KetZoomer

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answered Apr 9, 2019 at 16:46

Marios Nikolaou

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3 Comments

chepner Over a year ago

This is just verbose boilerplate that doesn't prevent the kind of inadvertent modifications the OP is concerned about.

Marios Nikolaou Over a year ago

@chepner fixed.

chepner Over a year ago

OK, now the getters and setters are just unnecessary boilerplate. Get rid of them.

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