code: def environment_variable(self, name, value):
      # Never set to None
      if value is None:
          return self
      self._kwargs["environment_variables"] = dict(
          self._kwargs.get("environment_variables", {}), **{name: value}
      )
      return self
  
imports: import json
  import math
  import random
  import time
  from metaflow.tracing import inject_tracing_vars
  from metaflow.exception import MetaflowException
  from metaflow.metaflow_config import KUBERNETES_SECRETS
label_desc: Use image node_id 11 for calling the KubernetesJob obj's underlying member method code with example usage: obj.environment_variable(name, value) and returns: self, self