Classes¶
Principles¶
Positional-only constructor arguments are forbidden¶
At the moment dependencies library use **kwargs expansion to pass arguments
into class constructor.
Positional-only parameters introduced in
python 3.8 broke this pattern. We have no plan to support this corner case in
dependencies core Injector algorithm.
>>> from dependencies import Injector
>>> class User:
... def __init__(self, /, name):
... self.name = name
...
... def __repr__(self):
... return f"User({self.name=!r})"
>>> User("Jeff")
User(self.name='Jeff')
>>> class Container(Injector):
... user = User
... name = "Jeff"
>>> Container.user
Traceback (most recent call last):
...
_dependencies.exceptions.DependencyError: 'User.__init__' have positional-only arguments
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