Unavailable Object
A placeholder object for optional dependencies.
Usage
from unavailable_object import UnavailableObject
try:
import optional_module
except ImportError:
optional_module = UnavailableObject("optional_module")
Type Checking
To not disturb the type checker, the alternative definition of optional_object should be guarded by if not TYPE_CHECKING
and type annotations put in quotes:
from typing import TYPE_CHECKING
from unavailable_object import UnavailableObject
try:
import optional_module
except ImportError:
if not TYPE_CHECKING:
optional_module = UnavailableObject("optional_module")
def foo(arg: "optional_module.SomeType") -> None:
pass
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unavailable-object-0.0.2.tar.gz
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