Remove (object) from class declarations. (#6658)

streaming/python/communication.py

@@ -31,7 +31,7 @@ def _hash(value):
         return int(hashlib.sha1(value).hexdigest(), 16)
 
 
-class DataChannel(object):
+class DataChannel:
     """A data channel for actor-to-actor communication.
 
     Attributes:
@@ -62,7 +62,7 @@ _CLOSE_FLAG = b" "
 
 
 # Pulls and merges data from multiple input channels
-class DataInput(object):
+class DataInput:
     """An input gate of an operator instance.
 
     The input gate pulls records from all input channels in a round-robin
@@ -124,7 +124,7 @@ class DataInput(object):
 
 
 # Selects output channel(s) and pushes data
-class DataOutput(object):
+class DataOutput:
     """An output gate of an operator instance.
 
     The output gate pushes records to output channels according to the

streaming/python/examples/key_selectors.py

@@ -17,7 +17,7 @@ parser.add_argument("--input-file", required=True, help="the input text file")
 
 
 # A class used to check attribute-based key selection
-class Record(object):
+class Record:
     def __init__(self, record):
         k, _ = record
         self.word = k

streaming/python/examples/wordcount.py

@@ -23,7 +23,7 @@ parser.add_argument(
 # A custom data source that reads articles from wikipedia
 # Custom data sources need to implement a get_next() method
 # that returns the next data element, in this case sentences
-class Wikipedia(object):
+class Wikipedia:
     def __init__(self, title_file):
         # Titles in this file will be as queries
         self.title_file = title_file

streaming/python/jobworker.py

@@ -16,7 +16,7 @@ logger = logging.getLogger(__name__)
 
 
 @ray.remote
-class JobWorker(object):
+class JobWorker:
     """A streaming job worker.
 
     Attributes:

streaming/python/operator.py

@@ -12,7 +12,7 @@ logger.setLevel("DEBUG")
 
 
 # Stream partitioning schemes
-class PScheme(object):
+class PScheme:
     def __init__(self, strategy, partition_fn=None):
         self.strategy = strategy
         self.partition_fn = partition_fn
@@ -51,7 +51,7 @@ class OpType(enum.Enum):
 
 
 # A logical dataflow operator
-class Operator(object):
+class Operator:
     def __init__(self,
                  id,
                  op_type,

streaming/python/streaming.py

@@ -34,7 +34,7 @@ all_to_all_strategies = [
 
 
 # Environment configuration
-class Conf(object):
+class Conf:
     """Environment configuration.
 
     This class includes all information about the configuration of the
@@ -253,7 +253,7 @@ class ExecutionGraph:
 
 
 # The execution environment for a streaming job
-class Environment(object):
+class Environment:
     """A streaming environment.
 
     This class is responsible for constructing the logical and the
@@ -394,7 +394,7 @@ class Environment(object):
 
 
 # A DataStream corresponds to an edge in the logical dataflow
-class DataStream(object):
+class DataStream:
     """A data stream.
 
     This class contains all information about a logical stream, i.e. an edge