code: def initialize_tracer(self, io_loop=None):
          
  
          with Config._initialized_lock:
              if Config._initialized:
                  logger.warn('Jaeger tracer already initialized, skipping')
                  return
              Config._initialized = True
  
          tracer = self.new_tracer(io_loop)
  
          self._initialize_global_tracer(tracer=tracer)
          return tracer
docs: Initialize Jaeger Tracer based on the passed `jaeger_client.Config`.
          Save it to `opentracing.tracer` global variable.
          Only the first call to this method has any effect.