python: add type hints

python/build/verify.py

@@ -1,6 +1,7 @@
 import hashlib
+from typing import cast, Any, BinaryIO
 
-def feed_file(h, f):
+def feed_file(h: Any, f: BinaryIO) -> None:
     """Feed data read from an open file into the hashlib instance."""
 
     while True:
@@ -10,20 +11,20 @@ def feed_file(h, f):
             break
         h.update(data)
 
-def feed_file_path(h, path):
+def feed_file_path(h: Any, path: str) -> None:
     """Feed data read from a file (to be opened by this function) into the hashlib instance."""
 
     with open(path, 'rb') as f:
         feed_file(h, f)
 
-def file_digest(algorithm, path):
+def file_digest(algorithm: Any, path: str) -> str:
     """Calculate the digest of a file and return it in hexadecimal notation."""
 
     h = algorithm()
     feed_file_path(h, path)
-    return h.hexdigest()
+    return cast(str, h.hexdigest())
 
-def guess_digest_algorithm(digest):
+def guess_digest_algorithm(digest: str) -> Any:
     l = len(digest)
     if l == 32:
         return hashlib.md5
@@ -36,7 +37,7 @@ def guess_digest_algorithm(digest):
     else:
         return None
 
-def verify_file_digest(path, expected_digest):
+def verify_file_digest(path: str, expected_digest: str) -> bool:
     """Verify the digest of a file, and return True if the digest matches with the given expected digest."""
 
     algorithm = guess_digest_algorithm(expected_digest)