fix: from_string method of blob and bucket class

google/cloud/storage/blob.py

@@ -330,15 +330,15 @@ def public_url(self):
         )
 
     @classmethod
-    def from_string(cls, uri, client=None):
+    def from_string(cls, uri, client):
         """Get a constructor for blob object by URI.
 
          :type uri: str
          :param uri: The blob uri pass to get blob object.
 
          :type client: :class:`~google.cloud.storage.client.Client` or
                       ``NoneType``
-         :param client: (Optional) The client to use.
+         :param client: The client to use.
 
          :rtype: :class:`google.cloud.storage.blob.Blob`
          :returns: The blob object created.

google/cloud/storage/bucket.py

@@ -612,15 +612,15 @@ def user_project(self):
         return self._user_project
 
     @classmethod
-    def from_string(cls, uri, client=None):
+    def from_string(cls, uri, client):
         """Get a constructor for bucket object by URI.
 
         :type uri: str
         :param uri: The bucket uri pass to get bucket object.
 
         :type client: :class:`~google.cloud.storage.client.Client` or
                       ``NoneType``
-        :param client: (Optional) The client to use.
+        :param client: The client to use.
 
         :rtype: :class:`google.cloud.storage.bucket.Bucket`
         :returns: The bucket object created.

google/cloud/storage/client.py

@@ -579,7 +579,7 @@ def download_blob_to_file(self, blob_or_uri, file_obj, start=None, end=None):
         try:
             blob_or_uri.download_to_file(file_obj, client=self, start=start, end=end)
         except AttributeError:
-            blob = Blob.from_string(blob_or_uri)
+            blob = Blob.from_string(blob_or_uri, self)
             blob.download_to_file(file_obj, client=self, start=start, end=end)
 
     def list_blobs(