Fix yapf formatting and ignore local venv

Author: Eliaaazzz

.gitignore

@@ -154,3 +154,4 @@ playground/cloudfunction.zip
 # Ignore .test-infra/metrics/github_runs_prefetcher/code.zip
 # as its generated with terraform
 .test-infra/metrics/sync/github/github_runs_prefetcher/code.zip
+.venv/

sdks/python/apache_beam/transforms/external.py

@@ -804,8 +804,8 @@ def expand(self, pvalueish: pvalue.PCollection) -> pvalue.PCollection:
               spec=beam_runner_api_pb2.FunctionSpec(
                   urn=common_urns.primitives.IMPULSE.urn),
               outputs={'out': transform_proto.inputs[tag]}))
-              
-    # Retrieve type hints and store them in variables 
+
+    # Retrieve type hints and store them in variables
     # to avoid duplicate calls and AttributeError
     hints = self.get_type_hints()
     output_coders = None