code: def init(envVarName, enableColorOutput=False):
      
      global _initialized
  
      if _initialized:
          return
  
      global _ENV_VAR_NAME
      _ENV_VAR_NAME = envVarName
  
      if enableColorOutput:
          _preformatLevels(envVarName + "_NO_COLOR")
      else:
          _preformatLevels(None)
  
      if envVarName in os.environ:
          # install a log handler that uses the value of the environment var
          setDebug(os.environ[envVarName])
      addLimitedLogHandler(stderrHandler)
  
      _initialized = True
docs: Initialize the logging system and parse the environment variable
      of the given name.
      Needs to be called before starting the actual application.