"Type Dict cannot be instantiated" error when executing code line from readme

[jn73]

I get this error when i try to match a Dict[str, int] :

I cant find any imports for Dict but assumed it was from typing?

In [1]: from pampy import match, _

In [2]: from typing import Dict

In [3]: match({"a": 1, "b": 2}, Dict[str, int], lambda x: x)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-3-e5c0ae675d5a> in <module>
----> 1 match({"a": 1, "b": 2}, Dict[str, int], lambda x: x)

~/.virtualenvs/sqlparse/lib/python3.7/site-packages/pampy/pampy.py in match(var, default, strict, *args)
    176
    177     for patt, action in pairs:
--> 178         matched_as_value, args = match_value(patt, var)
    179
    180         if matched_as_value:

~/.virtualenvs/sqlparse/lib/python3.7/site-packages/pampy/pampy.py in match_value(pattern, value)
     45         return match_dict(pattern, value)
     46     elif callable(pattern):
---> 47         return_value = pattern(value)
     48         if return_value is True:
     49             return True, [value]

/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/typing.py in __call__(self, *args, **kwargs)
    666     def __call__(self, *args, **kwargs):
    667         if not self._inst:
--> 668             raise TypeError(f"Type {self._name} cannot be instantiated; "
    669                             f"use {self._name.lower()}() instead")
    670         result = self.__origin__(*args, **kwargs)

TypeError: Type Dict cannot be instantiated; use dict() instead

[jn73]

same with:

match(1, Union[int, str], lambda s: s)

=> TypeError: Cannot instantiate typing.Union

[jn73]

version: Python 3.7.3

[jn73]

Looks like there's some issue with the version (0.2.1) i have installed (pip install pampy).

When i did a 'pip install -e .' from the latest source it works.

[miaoever]

Same issue here for the Python 3.7.3, installed by: pip install pampy

[aambrozkiewicz]

+1 same here

[santinic]

Sorry, typings are not supported yet in the pip version. Release 3.0.0 will have it, but I won't have time for a few weeks.
You can pip install the latest commit, and that should work. Try something like:

pip install git+git://github.com/santinic/pampy.git@27de362e63310eaa5044c7c87414d19aacefef56

[santinic]

Just published v0.3