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How to delete a class in python


By : Juan Correal
Date : August 01 2020, 10:00 AM
This might help you You can use del and gc to delete the subclass and then garbage collect:
code :
class A(object):

    def __init__(self):
        a = 1

class B(A):

    def __init__(self):
        b = 1


subclasses = A.__subclasses__()
print(subclasses)


class B(A):

    def __init__(self):
        b = 2

del B
import gc
gc.collect()

subclasses = A.__subclasses__()
print(subclasses)
[<class '__main__.B'>]
[<class '__main__.B'>]


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Is it possible to delete a method from an object (not class) in python?


By : maherma
Date : March 29 2020, 07:55 AM
Hope that helps I have a class with a few methods, some of which are only valid when the object is in a particular state. I would like to have the methods simply not be bound to the objects when they're not in a suitable state, so that I get something like: , Looks like the way to dir() works by default is:
code :
dir(obj) == sorted(obj.__dict__.keys() + dir(obj.__class__))
class Wizard(object):
    def __init__(self):
        self.mana = 0

    def __dir__(self):
        natdir = set(self.__dict__.keys() + dir(self.__class__))
        if self.mana <= 0:
            natdir.remove("domagic")
        return list(natdir)

    def addmana(self):
        self.mana += 1

    def domagic(self):
        if self.mana <= 0:
            raise NotEnoughMana()
        print "Abracadabra!"
        self.mana -= 1
>>> wiz = Wizard()

>>> [x for x in dir(wiz) if not x.startswith("_")]
['addmana', 'mana']

>>> wiz.addmana()

>>> [x for x in dir(wiz) if not x.startswith("_")]
['addmana', 'domagic', 'mana']

>>> wiz.domagic()
Abracadabra!

>>> [x for x in dir(wiz) if not x.startswith("_")]
['addmana', 'mana']

>>> wiz.domagic()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 13, in domagic
__main__.NotEnoughMana

Python class - Set & Delete methods?


By : ISKANDER
Date : March 29 2020, 07:55 AM
I wish this help you Why not just inherit from dict and use its interface? That way you can use Python's standard mapping operations instead of rolling your own:
code :
class Songs(dict):

    def load(self, song_id):
        with open(song_id, 'r') as f:
            for line in f:
                sid, name, genre = line.rstrip().split('::')[:3]
                self[sid] = [name, genre]

mysongs = Songs()
mysongs.load('barnes_and_barnes__fish_heads')
mysongs['barnes_and_barnes__fish_heads'] = ['roly poly', 'strange']  # set
del mysongs['barnes_and_barnes__fish_heads']                         # delete

Delete attribute from class instance python


By : user3321431
Date : March 29 2020, 07:55 AM
will help you other_attribute and my_attribute are not an attributes on the instance. They are attributes on the class. You'd have to delete attributes from there, or provide an instance attribute with the same name (and a different value) to mask the class attribute.
Deleting the attributes from the class means that they'll not be available anymore on any instance.

Why I cannot delete a class instance in python


By : Arpitha kalmady
Date : March 29 2020, 07:55 AM
like below fixes the issue I want to delete a class instance or make it None in python. But I'm not able to do it. In general my code does something as follows:- , You have a situation that looks like this:

What happens if I delete a nonexistent key in Python Dictionary Class?


By : twash
Date : March 29 2020, 07:55 AM
around this issue Let's say buff is a dictionary. I do del buff[k], but k is not a key in the buff. Is this an error, or you python just passes the line like nothing happened? , Let's test this:
code :
>>> buff={1:2,4:5}
>>> del buff[1]
>>> del buff[6]
Traceback (most recent call last):
  File "<string>", line 301, in runcode
  File "<interactive input>", line 1, in <module>
KeyError: 6
if k in buff:
    buff.pop(k)
try:
   buff.pop(k)
except KeyError:
   pass
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