Add type annotations to most functions

.travis.yml

@@ -12,4 +12,5 @@ install:
     - pip install -U . -r requirements-test.txt
 
 script:
+    - mypy tractor/  --ignore-missing-imports
     - pytest tests/ --no-print-logs

requirements-test.txt

@@ -1,3 +1,4 @@
 pytest
 pytest-trio
 pdbpp
+mypy

tractor/__init__.py

@@ -3,8 +3,9 @@
          ``trio`` and ``multiprocessing``.
 """
 from functools import partial
+import typing
 
-import trio
+import trio  # type: ignore
 
 from .log import get_console_log, get_logger, get_loglevel
 from ._ipc import _connect_chan, Channel
@@ -32,7 +33,13 @@
 _default_arbiter_port = 1616
 
 
-async def _main(async_fn, args, kwargs, name, arbiter_addr):
+async def _main(
+    async_fn: typing.Callable[..., typing.Awaitable],
+    args: typing.Tuple,
+    kwargs: typing.Dict[str, typing.Any],
+    name: str,
+    arbiter_addr: typing.Tuple[str, int]
+) -> typing.Any:
     """Async entry point for ``tractor``.
     """
     log = get_logger('tractor')
@@ -73,11 +80,11 @@ async def _main(async_fn, args, kwargs, name, arbiter_addr):
 
 
 def run(
-    async_fn,
-    *args,
-    name=None,
-    arbiter_addr=(_default_arbiter_host, _default_arbiter_port),
-    **kwargs
+    async_fn: typing.Callable[..., typing.Awaitable],
+    *args: typing.Tuple,
+    name: str = None,
+    arbiter_addr: typing.Tuple[str, int] = (_default_arbiter_host, _default_arbiter_port),
+    **kwargs: typing.Dict[str, typing.Any],
 ):
     """Run a trio-actor async function in process.