mypy: add typing annotations for novel lister abstractions

swh/lister/core/simple_lister.py

@@ -5,8 +5,9 @@
 
 import logging
 
-from swh.core import utils
+from typing import Any, List
 
+from swh.core import utils
 from .lister_base import ListerBase
 
 
@@ -20,7 +21,7 @@ class SimpleLister(ListerBase):
       information and stores those in db
 
     """
-    def list_packages(self, *args):
+    def list_packages(self, response: Any) -> List[Any]:
         """Listing packages method.
 
         """

swh/lister/cran/lister.py

@@ -77,7 +77,7 @@ class CRANLister(SimpleLister):
         """
         return None
 
-    def list_packages(self, *args) -> List[Mapping[str, str]]:
+    def list_packages(self, response) -> List[Mapping[str, str]]:
         """Runs R script which uses inbuilt API to return a json response
            containing data about the R packages.
 

swh/lister/debian/__init__.py

@@ -3,13 +3,13 @@
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-from typing import Any, Mapping, Optional
+from typing import Any, List, Mapping, Optional
 
 
 def debian_init(db_engine, lister=None,
                 override_conf: Optional[Mapping[str, Any]] = None,
-                distributions: Optional[str] = ['stretch', 'buster'],
-                area_names: Optional[str] = ['main', 'contrib', 'non-free']):
+                distributions: List[str] = ['stretch', 'buster'],
+                area_names: List[str] = ['main', 'contrib', 'non-free']):
     """Initialize the debian data model.
 
     Args: