tvalentyn commented on a change in pull request #16372:
URL: https://github.com/apache/beam/pull/16372#discussion_r776441707



##########
File path: sdks/python/apache_beam/options/pipeline_options_validator.py
##########
@@ -365,3 +368,16 @@ def validate_environment_options(self, view):
           self._validate_error(
               self.ERR_INVALID_ENVIRONMENT, 'environment_config', 'LOOPBACK'))
     return errors
+
+  def validate_repeatable_argument_passed_as_list(self, view, arg_name):
+    """Validates that repeatable PipelineOptions like dataflow_service_options

Review comment:
       nit: comment wording. Suggestion:
   ```
       Validates that repeatable PipelineOptions like dataflow_service_options
       or experiments are specified as a list when set programmatically. This
       way, users do not inadvertently specify them as a string, which triggers
       incorrect implicit string -> list conversion.
   ```




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