Add _unused_kwargs to each filesystem (to avoid strict filesystem dep…

…endency in open_url arguments)

pfio/v2/hdfs.py

@@ -180,8 +180,9 @@ class Hdfs(FS):
 
     '''
 
-    def __init__(self, cwd=None):
+    def __init__(self, cwd=None, **_unused_kwargs):
         super().__init__()
+        del _unused_kwargs
         self._fs = _create_fs()
         assert self._fs is not None
         self.username = self._get_principal_name()

pfio/v2/local.py

@@ -43,8 +43,10 @@ def __init__(self, _stat, filename):
 
 
 class Local(FS):
-    def __init__(self, cwd=None):
+    def __init__(self, cwd=None, **_unused_kwargs):
         super().__init__()
+        del _unused_kwargs
+
         if cwd is None:
             self._cwd = ''
         else:

pfio/v2/s3.py

@@ -305,8 +305,11 @@ def __init__(self, bucket, prefix=None,
                  aws_access_key_id=None,
                  aws_secret_access_key=None,
                  mpu_chunksize=32*1024*1024,
-                 buffering=-1):
+                 buffering=-1,
+                 **_unused_kwargs):
         super().__init__()
+        del _unused_kwargs
+
         self.bucket = bucket
         if prefix is not None:
             self.cwd = prefix

pfio/v2/zip.py

@@ -52,8 +52,9 @@ def __init__(self, zip_info):
 class Zip(FS):
     _readonly = True
 
-    def __init__(self, backend, file_path, mode='r', cwd=None):
+    def __init__(self, backend, file_path, mode='r', **_unused_kwargs):
         super().__init__()
+        del _unused_kwargs
         self.backend = backend
         self.file_path = file_path
         self.mode = mode