docstr: like [x for x in y if x.selector == value]
code: def filter_equals(self, selector, value):
      """like [x for x in y if x.selector == value]"""
      selector = make_selector_fn(selector)
      return self.filter(lambda r: selector(r) == value)
  
imports: import collections
  import inspect
  import json
  import types
  import unittest
  import warnings
  import math
  import numpy
label_desc: Use image node_id 21 for calling the Q obj's underlying member method code with example usage: obj.filter_equals(selector, value) and returns: self