loading fails for typing.Tuple[()] #517
Description
How to reproduce:
Run this code with 0.3.4 you will see it pass.
Run in 0.3.5.1 and you will see it fail.
import dill
from typing import Union, Tuple
FeatureValueType = Union[str, int, float] # pylint: disable=invalid-name
SingletonSliceKeyType = Tuple[str, FeatureValueType] # pylint: disable=invalid-name
A_TYPE = Union[Tuple[()], Tuple[SingletonSliceKeyType, ...]]
def a_function() -> A_TYPE:
return ('string', 'feature_value_type')
serialized = dill.dumps(a_function)
loaded = dill.loads(serialized)
print(loaded())
I get the following error in 0.3.5.1
Traceback (most recent call last):
File "/Users/ryanthompson/PycharmProjects/learningProjects/dill_regression/regression_test.py", line 13, in <module>
loaded = dill.loads(serialized)
File "/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/site-packages/dill/_dill.py", line 387, in loads
return load(file, ignore, **kwds)
File "/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/site-packages/dill/_dill.py", line 373, in load
return Unpickler(file, ignore=ignore, **kwds).load()
File "/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/site-packages/dill/_dill.py", line 646, in load
obj = StockUnpickler.load(self)
File "/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/typing.py", line 804, in __getitem__
return self.__getitem_inner__(params)
File "/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/typing.py", line 261, in inner
return func(*args, **kwds)
File "/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/typing.py", line 830, in __getitem_inner__
params = tuple(_type_check(p, msg) for p in params)
File "/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/typing.py", line 830, in <genexpr>
params = tuple(_type_check(p, msg) for p in params)
File "/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/typing.py", line 149, in _type_check
raise TypeError(f"{msg} Got {arg!r:.100}.")
TypeError: Tuple[t0, t1, ...]: each t must be a type. Got ().