fix more type errors

poetry/repositories/repository.py

@@ -111,7 +111,7 @@ def find_links_for_package(self, package: "Package") -> List["Link"]:
         return []
 
     def search(self, query: str) -> List["Package"]:
-        results = []
+        results: List["Package"] = []
 
         for package in self.packages:
             if query in package.name:

poetry/utils/password_manager.py

@@ -125,7 +125,7 @@ def __init__(self, config: "Config") -> None:
         self._keyring = None
 
     @property
-    def keyring(self) -> KeyRing:
+    def keyring(self) -> Optional[KeyRing]:
         if self._keyring is None:
             self._keyring = KeyRing("poetry-repository")
             if not self._keyring.is_available():

poetry/utils/setup_reader.py

@@ -311,7 +311,7 @@ def _find_single_string(
                 value = self._find_in_dict(variable, name)
 
         if value is None:
-            return
+            return None
 
         if isinstance(value, ast.Str):
             return value.s
@@ -325,6 +325,7 @@ def _find_in_call(self, call: ast.Call, name: str) -> Optional[Any]:
         for keyword in call.keywords:
             if keyword.arg == name:
                 return keyword.value
+        return None
 
     def _find_call_kwargs(self, call: ast.Call) -> Optional[Any]:
         kwargs = None
@@ -356,3 +357,4 @@ def _find_in_dict(
         for key, val in zip(dict_.keys, dict_.values):
             if isinstance(key, ast.Str) and key.s == name:
                 return val
+        return None

poetry/utils/shell.py

@@ -2,9 +2,9 @@
 import signal
 import sys
 
-from pathlib import Optional
 from pathlib import Path
 from typing import Any
+from typing import Optional
 
 import pexpect