add some missing type annotations (python-poetry#387)

src/poetry/core/masonry/metadata.py

@@ -13,35 +13,35 @@ class Metadata:
 
     metadata_version = "2.1"
     # version 1.0
-    name = None
+    name: str | None = None
     version: str
-    platforms = ()
-    supported_platforms = ()
-    summary = None
-    description = None
-    keywords = None
-    home_page = None
-    download_url = None
-    author = None
-    author_email = None
-    license = None
+    platforms: tuple[str, ...] = ()
+    supported_platforms: tuple[str, ...] = ()
+    summary: str | None = None
+    description: str | None = None
+    keywords: str | None = None
+    home_page: str | None = None
+    download_url: str | None = None
+    author: str | None = None
+    author_email: str | None = None
+    license: str | None = None
     # version 1.1
     classifiers: tuple[str, ...] = ()
-    requires = ()
-    provides = ()
-    obsoletes = ()
+    requires: tuple[str, ...] = ()
+    provides: tuple[str, ...] = ()
+    obsoletes: tuple[str, ...] = ()
     # version 1.2
-    maintainer = None
-    maintainer_email = None
-    requires_python = None
-    requires_external = ()
+    maintainer: str | None = None
+    maintainer_email: str | None = None
+    requires_python: str | None = None
+    requires_external: tuple[str, ...] = ()
     requires_dist: list[str] = []
-    provides_dist = ()
-    obsoletes_dist = ()
+    provides_dist: tuple[str, ...] = ()
+    obsoletes_dist: tuple[str, ...] = ()
     project_urls: tuple[str, ...] = ()
 
     # Version 2.1
-    description_content_type = None
+    description_content_type: str | None = None
     provides_extra: list[str] = []
 
     @classmethod

src/poetry/core/packages/dependency.py

@@ -90,7 +90,7 @@ def __init__(
 
         self.is_root = False
         self._marker: BaseMarker = AnyMarker()
-        self.source_name = None
+        self.source_name: str | None = None
 
     @property
     def name(self) -> str: