4 files changed, 5 insertions, 5 deletions
diff --git a/python/sandcrawler/minio.py b/python/sandcrawler/minio.py
index d47ab89..8836515 100644
--- a/python/sandcrawler/minio.py
+++ b/python/sandcrawler/minio.py
@@ -99,7 +99,7 @@ class SandcrawlerMinioClient(object):
         sha1hex: str,
         extension: str = "",
         prefix: str = "",
-        bucket: str = None,
+        bucket: Optional[str] = None,
     ) -> bytes:
         """
         sha1hex is sha1 of the blob itself
diff --git a/python/sandcrawler/misc.py b/python/sandcrawler/misc.py
index 4ab9082..4e37036 100644
--- a/python/sandcrawler/misc.py
+++ b/python/sandcrawler/misc.py
@@ -281,7 +281,7 @@ def requests_retry_session(
     retries: int = 10,
     backoff_factor: int = 1,
     status_forcelist: List[int] = [500, 502, 504],
-    session: requests.Session = None,
+    session: Optional[requests.Session] = None,
 ) -> requests.Session:
     """
     From: https://www.peterbe.com/plog/best-practice-with-retries-with-requests
diff --git a/python/sandcrawler/pdftrio.py b/python/sandcrawler/pdftrio.py
index 1119211..112df6a 100644
--- a/python/sandcrawler/pdftrio.py
+++ b/python/sandcrawler/pdftrio.py
@@ -82,7 +82,7 @@ class PdfTrioWorker(SandcrawlerFetchWorker):
         self.pdftrio_client = pdftrio_client
         self.sink = sink
 
-    def process(self, record: Any, key: str = None) -> Any:
+    def process(self, record: Any, key: Optional[str] = None) -> Any:
         start_process = time.time()
         fetch_sec = None
 
@@ -126,7 +126,7 @@ class PdfTrioBlobWorker(SandcrawlerWorker):
         self.sink = sink
         self.mode = mode
 
-    def process(self, blob: Any, key: str = None) -> Any:
+    def process(self, blob: Any, key: Optional[str] = None) -> Any:
         start_process = time.time()
         if not blob:
             return None
diff --git a/python/sandcrawler/workers.py b/python/sandcrawler/workers.py
index 15363ea..356f050 100644
--- a/python/sandcrawler/workers.py
+++ b/python/sandcrawler/workers.py
@@ -108,7 +108,7 @@ class SandcrawlerWorker(object):
         """
         return True
 
-    def process(self, task: Any, key: str = None) -> Any:
+    def process(self, task: Any, key: Optional[str] = None) -> Any:
         """
         Derived workers need to implement business logic here.