Type-hint an object that implements two interfaces
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Is there a way to type hint that an object implements two different interfaces? Perhaps similar to the fake my_function example below.
class SomeLibraryClass(InterfaceA, InterfaceB):
...
def my_function(obj: Multiple[InterfaceA, InterfaceB]):
obj.do_interface_a_stuff()
obj.do_interface_b_stuff()
I can't modify SomeLibraryClass. I could define class AB(InterfaceA, InterfaceB) but the type checking tools I use will still flag SomeLibraryClass as not implementing AB. This solution also leads to a proliferation of classes defining all combinations of interfaces we want to type hint about. (It may be this is the 'the correct way' to do things, in which case that would be the answer!)
python-3.x
asked Nov 21 '18 at 23:09
ZeroZero
4,58953660
add a comment |
Is there a way to type hint that an object implements two different interfaces? Perhaps similar to the fake my_function example below.
class SomeLibraryClass(InterfaceA, InterfaceB):
...
def my_function(obj: Multiple[InterfaceA, InterfaceB]):
obj.do_interface_a_stuff()
obj.do_interface_b_stuff()
I can't modify SomeLibraryClass. I could define class AB(InterfaceA, InterfaceB) but the type checking tools I use will still flag SomeLibraryClass as not implementing AB. This solution also leads to a proliferation of classes defining all combinations of interfaces we want to type hint about. (It may be this is the 'the correct way' to do things, in which case that would be the answer!)
python-3.x
asked Nov 21 '18 at 23:09
ZeroZero
4,58953660
add a comment |
Is there a way to type hint that an object implements two different interfaces? Perhaps similar to the fake my_function example below.
class SomeLibraryClass(InterfaceA, InterfaceB):
...
def my_function(obj: Multiple[InterfaceA, InterfaceB]):
obj.do_interface_a_stuff()
obj.do_interface_b_stuff()
I can't modify SomeLibraryClass. I could define class AB(InterfaceA, InterfaceB) but the type checking tools I use will still flag SomeLibraryClass as not implementing AB. This solution also leads to a proliferation of classes defining all combinations of interfaces we want to type hint about. (It may be this is the 'the correct way' to do things, in which case that would be the answer!)
python-3.x
asked Nov 21 '18 at 23:09
ZeroZero
4,58953660
Is there a way to type hint that an object implements two different interfaces? Perhaps similar to the fake my_function example below.
class SomeLibraryClass(InterfaceA, InterfaceB):
...
def my_function(obj: Multiple[InterfaceA, InterfaceB]):
obj.do_interface_a_stuff()
obj.do_interface_b_stuff()
I can't modify SomeLibraryClass. I could define class AB(InterfaceA, InterfaceB) but the type checking tools I use will still flag SomeLibraryClass as not implementing AB. This solution also leads to a proliferation of classes defining all combinations of interfaces we want to type hint about. (It may be this is the 'the correct way' to do things, in which case that would be the answer!)
python-3.x
python-3.x
asked Nov 21 '18 at 23:09
ZeroZero
4,58953660
asked Nov 21 '18 at 23:09
ZeroZero
4,58953660
edited Nov 21 '18 at 23:15
Zero
asked Nov 21 '18 at 23:09
ZeroZero
4,58953660
asked Nov 21 '18 at 23:09
ZeroZero
4,58953660
asked Nov 21 '18 at 23:09
ZeroZero
4,58953660
4,58953660
add a comment |
add a comment |
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