class_docstr: Exponential Distribution 
class_docstr_tok: ["Exponential","Distribution"]
docstr: Returns mean 
docstr_tok: ["Returns","mean"]
code: def get_mean(self):
      """Returns mean"""
      return 1 / self.lam
  
imports: from __future__ import absolute_import
  from __future__ import division
  import numpy
  from .distribution import Continuous
  from ..exd import domains
label_desc: Use image node_id 7 for calling the Exponential obj's underlying member method code with example usage: obj.get_mean() and returns: unknown