old_contents: from __future__ import absolute_import
  import opentracing as ot
  from basictracer.context import SpanContext
  from instana import util, log
  
  prefix_tracer_state = 'X-INSTANA-'
  field_name_trace_id = prefix_tracer_state + 'T'
  field_name_span_id = prefix_tracer_state + 'S'
  field_count = 2
  
  
  class HTTPPropagator():
      """A Propagator for Format.HTTP_HEADERS. """
  
      def inject(self, span_context, carrier):
          try:
              trace_id = util.id_to_header(span_context.trace_id)
              span_id = util.id_to_header(span_context.span_id)
              if type(carrier) is dict or hasattr(carrier, "__dict__"):
                  carrier[field_name_trace_id] = trace_id
                  carrier[field_name_span_id] = span_id
              elif type(carrier) is list:
                  trace_header = (field_name_trace_id, trace_id)
                  carrier.append(trace_header)
                  span_header = (field_name_span_id, span_id)
                  carrier.append(span_header)
              else:
                  raise Exception("Unsupported carrier type", type(carrier))
  
          except Exception as e:
              log.debug("inject error: ", str(e))
  
      def extract(self, carrier):  # noqa
          try:
              if type(carrier) is dict or hasattr(carrier, "__dict__"):
                  dc = carrier
              elif type(carrier) is list:
                  dc = dict(carrier)
              else:
                  raise ot.SpanContextCorruptedException()
  
              if field_name_trace_id in dc and field_name_span_id in dc:
                  trace_id = util.header_to_id(dc[field_name_trace_id])
                  span_id = util.header_to_id(dc[field_name_span_id])
  
              return SpanContext(span_id=span_id,
                                 trace_id=trace_id,
                                 baggage={},
                                 sampled=True)
  
          except Exception as e:
              log.debug("extract error: ", str(e))
  
new_contents: from __future__ import absolute_import
  import opentracing as ot
  from basictracer.context import SpanContext
  from instana import util, log
  
  prefix_tracer_state = 'X-Instana-'
  field_name_trace_id = prefix_tracer_state + 'T'
  field_name_span_id = prefix_tracer_state + 'S'
  field_count = 2
  
  
  class HTTPPropagator():
      """A Propagator for Format.HTTP_HEADERS. """
  
      def inject(self, span_context, carrier):
          try:
              trace_id = util.id_to_header(span_context.trace_id)
              span_id = util.id_to_header(span_context.span_id)
              if type(carrier) is dict or hasattr(carrier, "__dict__"):
                  carrier[field_name_trace_id] = trace_id
                  carrier[field_name_span_id] = span_id
              elif type(carrier) is list:
                  trace_header = (field_name_trace_id, trace_id)
                  carrier.append(trace_header)
                  span_header = (field_name_span_id, span_id)
                  carrier.append(span_header)
              else:
                  raise Exception("Unsupported carrier type", type(carrier))
  
          except Exception as e:
              log.debug("inject error: ", str(e))
  
      def extract(self, carrier):  # noqa
          try:
              if type(carrier) is dict or hasattr(carrier, "__dict__"):
                  dc = carrier
              elif type(carrier) is list:
                  dc = dict(carrier)
              else:
                  raise ot.SpanContextCorruptedException()
  
              if field_name_trace_id in dc and field_name_span_id in dc:
                  trace_id = util.header_to_id(dc[field_name_trace_id])
                  span_id = util.header_to_id(dc[field_name_span_id])
  
              return SpanContext(span_id=span_id,
                                 trace_id=trace_id,
                                 baggage={},
                                 sampled=True)
  
          except Exception as e:
              log.debug("extract error: ", str(e))
  
subject: Fix capitalization to default style.