How Best to Initialize a Class Using an Attribute from Attrs?
In Vanilla Python to Create a Class Which, When Initiated, Would Also Initiate Another Class I Would Use __Init__(Self): Class Someclass: __Init__(Self, Token...
In vanilla Python to create a class which, when initiated, would also initiate another class I would use __init__(self):
class SomeClass:
__init__(self, token: str):
self.token = token
client = WebClient(auth=self.token)
But in attrs, I can't do this. The following yields an error because it is passing a _CountringAttr object, not the resolved string.
@attr.s()
class SomeClass:
token: str = attr.ib()
client = WebClient(auth=token)
What is the "right" way of accomplishing this?
1 Answer
You can either use a default:
@attr.define
class SomeClass:
token: str
client: WebClient = attr.field() # needed! attr.ib works too
@client.default
def _client_factory(self):
return WebClient(self.token)
or __attrs_post_init__:
@attr.define
class SomeClass:
token: str
client: WebClient = attr.field(init=False)
def __attrs_post_init__(self):
self.client = WebClient(self.token)
P.S. I'm using the modern attrs APIs to make them more known. Check out if you want to know more.
Chloe Bennett explores the intersection of pop culture, streaming entertainment, digital trends, and contemporary lifestyle. Her weekly commentary reaches thousands of culture enthusiasts.
