class_docstr: A feed that loads values from CSV formatted files.
  
  :param dateTimeColumn: The name of the column that has the datetime information.
  :type dateTimeColumn: string.
  :param dateTimeFormat: The datetime format. datetime.datetime.strptime will be used to parse the column.
  :type dateTimeFormat: string.
  :param converter: A function with two parameters (column name and value) used to convert the string
      value to something else. The default coverter will try to convert the value to a float. If that fails
      the original string is returned.
  :type converter: function.
  :param delimiter: The string used to separate values.
  :type delimiter: string.
  :param timezone: The timezone to use to localize datetimes. Check :mod:`pyalgotrade.marketsession`.
  :type timezone: A pytz timezone.
  :param maxLen: The maximum number of values that each :class:`pyalgotrade.dataseries.DataSeries` will hold.
      Once a bounded length is full, when new items are added, a corresponding number of items are discarded from the
      opposite end. If None then dataseries.DEFAULT_MAX_LEN is used.
  :type maxLen: int.
code: def setDateRange(self, fromDateTime, toDateTime):
      self.setRowFilter(DateRangeFilter(fromDateTime, toDateTime))
  
imports: import abc
  import datetime
  import six
  from pyalgotrade.utils import dt
  from pyalgotrade.utils import csvutils
  from pyalgotrade.feed import memfeed
label_desc: Use image node_id 3 for calling the Feed obj's underlying member method code with example usage: obj.setDateRange(fromDateTime, toDateTime) without return types