CODEWITHSUNDEEP
pythonclassobjectmemoryinstance
code gen
code gen

Reputation: 11

How to read the object name from memory?

I wrote a simple class code like below.

class Fridge:

def __init__(self):
    self.isOpened = False
    self.foods = []

def open(self):
    self.isOpened = True

def put(self, thing):
    if self.isOpened:
        self.foods.append(thing)

def close(self):
    self.isOpened = False

class Food:
    pass

And then import the module...

import class_practice as fridge

f = fridge.Fridge()
apple = fridge.Food()
elephant = fridge.Food()

f.open()
f.put(apple)
f.put(elephant)

print(f.foods)

The print output is

[<class_practice.Food object at 0x7fe761fce5f8>, <class_practice.Food object at 0x7fe761fce710>]

In this case, if I want to print out f.foods as the object name of [apple, elephant],

how could I do?

##Revised##

I want to extract data from

[<class_practice.Food object at 0x7fe761fce5f8>, <class_practice.Food object at 0x7fe761fce710>]

as the form of ['apple', 'elephant'].

It is like,

a = 'hello'
b = id(a)
print(ctypes.cast(b, ctypes.py_object).value)

And then, the result is 'hello'

Upvotes: 1

Views: 140

Answers (2)

U13-Forward
U13-Forward

Reputation: 71620

Or try the following:

class Fridge:

    def __init__(self):
        self.isOpened = False
        self.foods = []

    def open(self):
        self.isOpened = True

    def put(self, thing):
        if self.isOpened:
            self.foods.append(thing)

    def close(self):
        self.isOpened = False

class Food:
    def __init__(self, value):
        self.value = value
     
    def __repr__(self):
        return self.value

import class_practice as fridge
f = fridge.Fridge()
f.open()
f.put(fridge.Food('apple'))
f.put(fridge.Food('elephant'))
print(f.foods)

Output:

[apple, elephant]

Upvotes: 0

salparadise
salparadise

Reputation: 5825

Store the value in a instance attribute, and return it from the __repr__ dunder method:

class Food:
    def __init__(self, value):
        self.value = value
     
    def __repr__(self):
        return self.value

You will need to pass the value when constructing Food:

apple = fridge.Food("apple")
elephant = fridge.Food("elephant")

Upvotes: 1

Related Questions