Adding eth-typing dependency and enabling type hiting

* Fixes first part of ethereum#69
TODO: Add all missing type hints

Author: 6ug

setup.py

@@ -18,12 +18,14 @@
     install_requires=[
         "eth-hash>=0.1.0,<1.0.0",
         "eth-utils>=1.3.0,<2.0.0",
+        "eth-typing>=2.0.0,<3",
         "rlp>=0.4.7,<2.0.0",
     ],
     license="MIT",
     zip_safe=False,
     keywords='ethereum blockchain evm trie merkle',
     packages=find_packages(exclude=["tests", "tests.*"]),
+    package_data={'trie': ['py.typed']},
     classifiers=[
         'Development Status :: 2 - Pre-Alpha',
         'Intended Audience :: Developers',

tox.ini

@@ -23,4 +23,6 @@ basepython =
 [testenv:lint]
 basepython=python
 deps=flake8
-commands=flake8 {toxinidir}/trie {toxinidir}/tests
+commands=
+    flake8 {toxinidir}/trie {toxinidir}/tests
+    mypy --follow-imports=silent --warn-unused-ignores --ignore-missing-imports --no-strict-optional --check-untyped-defs --disallow-incomplete-defs --disallow-untyped-defs --disallow-any-generics -p py-trie