parameters: ()
return_statement: return Tracer(default_path)
docstring: Gets a default call tracer based on environment variables.
docstring_summary: Gets a default call tracer based on environment variables.
docstring_tokens: Gets a default call tracer based on environment variables .
function: def get_default_tracer() -> Optional[Tracer]:
    """Gets a default call tracer based on environment variables."""
    default_path = os.getenv(TRACE_PATH_ENV_KEY)
    if not default_path:
      return None
    return Tracer(default_path)
function_tokens: def get_default_tracer ( ) -> Optional [ Tracer ] : default_path = os . getenv ( TRACE_PATH_ENV_KEY ) if not default_path : return None return Tracer ( default_path )