class_docstr: Wrap a list of datapoints to a DataFlow
class_docstr_tok: ["Wrap","a","list","of","datapoints","to","a","DataFlow"]
code: def __len__(self):
      return len(self.lst)
  
imports: import copy
  import numpy
  import six
  from .base import DataFlow, RNGDataFlow
label_desc: Use image node_id 2 for calling the DataFromList obj's underlying member method code with example usage: obj.__len__() and returns: len