code: def buildCollection(self, maxLen):
      return collections.ListDeque(maxLen)
  
imports: import datetime
  from six.moves import xrange
  from .None import common
  from pyalgotrade import utils
  from pyalgotrade.utils import collections
  from pyalgotrade.utils import dt
label_desc: Use image node_id 1 for calling the ListDequeTestCase obj's underlying member method code with example usage: obj.buildCollection(maxLen) and returns: collections