class_docstr: Reader for OHCLV pricing data at a session frequency.
class_docstr_tok: ["Reader","for","OHCLV","pricing","data","at","a","session","frequency","."]
code: def data_frequency(self):
      return "session"
  
imports: from abc import abstractproperty
  from catalyst.data.bar_reader import BarReader
label_desc: Use image node_id 1 for calling the SessionBarReader obj's underlying member method code with example usage: obj.data_frequency() and returns: str