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Check if a class is a dataclass in Python


By : Muhammad Arslan Ilya
Date : October 18 2020, 06:10 PM
Hope that helps Docs
code :
import dataclasses
dataclasses.is_dataclass(something)


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control initialize order when Python dataclass inheriting a class


By : user123
Date : March 29 2020, 07:55 AM
Does that help Actually there is one method which is called before __init__: it is __new__. So you can do such a trick: call Base.__init__ in Child.__new__. I can't say is it a good solution, but if you are insterested, here is a working example:
code :
class Base:
    def __init__(self, a):
        self.a = 1


@dataclass
class Child(Base):
    a: int

    def __new__(cls, *args, **kwargs):
        obj = object.__new__(cls)
        Base.__init__(obj, *args, **kwargs)
        return obj


c = Child(a=3)
print(c.a)  # 3, not 1, because Child.__init__ overrides a

In Kotlin, how to check List<Any> contains one or another dataclass?


By : user2731624
Date : March 29 2020, 07:55 AM
like below fixes the issue i think you can use the cool when feature here that kotlin provides. for example:
code :
class SpinnerAdapter(var name: List<Any>) {
init {
    when(name.first()){
        is Card -> {
            //  do something
        }

        is Currency -> {
            //  do something
        }

        else -> // do something
    }
}

Misspelled fields in a @dataclass Python class


By : J Doubee
Date : March 29 2020, 07:55 AM
wish help you to fix your issue One straightforward way (which works with any class) is to define __slots__:
code :
In [1]: from dataclasses import dataclass

In [2]: @dataclass
   ...: class Foo:
   ...:     __slots__ = 'bar','baz'
   ...:     bar: int
   ...:     baz: int
   ...:

In [3]: foo = Foo(42, 88)

In [4]: foo.biz = 10
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-4-d52b60444257> in <module>()
----> 1 foo.biz = 10

AttributeError: 'Foo' object has no attribute 'biz'

Python: Dataclass that inherits from base Dataclass, how do I upgrade a value from base to the new class?


By : faces mie
Date : March 29 2020, 07:55 AM
I wish this helpful for you You probably do not want to have the class itself be a mutable property, and instead use something such as an enum to indicate a status such as this. Depending on the requirements, you may consider one of a few patterns:
code :
class RelationshipStatus(Enum):
    STRANGER = 0
    FRIEND = 1
    PARTNER = 2

@dataclass
class Person(metaclass=ABCMeta):
    full_name: str
    smell: str = "good"
    status: RelationshipStatus = RelationshipStatus.STRANGER

@dataclass
class GreetablePerson(Person):
    nickname: str = ""

    @property
    def greet_name(self):
        if self.status == RelationshipStatus.STRANGER:
            return self.full_name
        else:
            return self.nickname

    def say_hi(self):
        print(f"Hi {self.greet_name}")

if __name__ == '__main__':
    random_stranger = GreetablePerson(full_name="Robert Thirstwilder",
                                      nickname="Bobby")
    random_stranger.status = RelationshipStatus.STRANGER
    random_stranger.say_hi()
    random_stranger.status = RelationshipStatus.FRIEND
    random_stranger.say_hi()
friend = attr.evolve(random_stranger, status=RelationshipStatus.FRIEND)

Dataclass nested within another dataclass does not update data correctly


By : Faten
Date : October 01 2020, 09:00 AM
wish helps you What you are currently doing is providing a default value for the field. As that value is a mutable object, changes to that object will be visible to all instances of your dataclass.
What you should do instead is provide a default factory that produces sub1 instances for each new A instance:
code :
from dataclasses import field

@dataclass
class A:
    a: int = 1
    s1: sub1 = field(default_factory=sub1)

a = A()
aa = A()
aa.a = 9
aa.s1.r = "92"
print("a:", repr(a))  # a: A(a=1, s1=sub1(q=10, r='qrst'))
print("aa:", repr(aa))  # aa: A(a=9, s1=sub1(q=10, r='92'))
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