code: def create_node(kwargs):
      '''
      Convenience function to make the rest api call for node creation.
      '''
      if not isinstance(kwargs, dict):
          kwargs = {}
  
      # Required parameters
      params = {
          'Action': 'CreateInstance',
          'InstanceType': kwargs.get('size_id', ''),
          'RegionId': kwargs.get('region_id', DEFAULT_LOCATION),
          'ImageId': kwargs.get('image_id', ''),
          'SecurityGroupId': kwargs.get('securitygroup_id', ''),
          'InstanceName': kwargs.get('name', ''),
      }
  
      # Optional parameters'
      optional = [
          'InstanceName', 'InternetChargeType',
          'InternetMaxBandwidthIn', 'InternetMaxBandwidthOut',
          'HostName', 'Password', 'SystemDisk.Category', 'VSwitchId'
          # 'DataDisk.n.Size', 'DataDisk.n.Category', 'DataDisk.n.SnapshotId'
      ]
  
      for item in optional:
          if item in kwargs:
              params.update({item: kwargs[item]})
  
      # invoke web call
      result = query(params)
      return result['InstanceId'f create_node(kwargs):
      '''
      Convenience function to make the rest api call for node creation.
      '''
      if not isinstance(kwargs, dict):
          kwargs = {}
  
      # Required parameters
      params = {
          'Action': 'CreateInstance',
          'InstanceType': kwargs.get('size_id', ''),
          'RegionId': kwargs.get('region_id', DEFAULT_LOCATION),
          'ImageId': kwargs.get('image_id', ''),
          'SecurityGroupId': kwargs.get('securitygroup_id', ''),
          'InstanceName': kwargs.get('name', ''),
      }
  
      # Optional parameters'
      optional = [
          'InstanceName', 'InternetChargeType',
          'InternetMaxBandwidthIn', 'InternetMaxBandwidthOut',
          'HostName', 'Password', 'SystemDisk.Category', 'VSwitchId'
          # 'DataDisk.n.Size', 'DataDisk.n.Category', 'DataDisk.n.SnapshotId'
      ]
  
      for item in optional:
          if item in kwargs:
              params.update({item: kwargs[item]})
  
      # invoke web call
      result = query(params)
      return result['InstanceId']
docs: Convenience function to make the rest api call for node creation.