code: def resolve(self, value=None):
          
  
          # If we still have an uninitialized matcher init it now
          if self.matcher:
              self._init_matcher()
  
          # Evaluate the current set of matchers forming the expression
          matcher = self.evaluate()
  
          try:
              value = self._transform(value)
              self._assertion(matcher, value)
          except AssertionError as ex:
              # By re-raising here the exception we reset the traceback
              raise ex
          finally:
              # Reset the state of the object so we can use it again
              if self.deferred:
                  self.reset()
docs: Resolve the current expression against the supplied value