text: # Copyright 2019, OpenCensus Authors
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from opencensus.ext.azure.trace_exporter import AzureExporter
  from opencensus.trace.samplers import ProbabilitySampler
  from opencensus.trace.tracer import Tracer
  
  # TODO: you need to specify the instrumentation key in a connection string
  # and place it in the APPLICATIONINSIGHTS_CONNECTION_STRING
  # environment variable.
  tracer = Tracer(exporter=AzureExporter(), sampler=ProbabilitySampler(1.0))
  
  with tracer.span(name='foo'):
      print('Hello, World!')
  input(...)
  