parameters: (key)
docstring: Starts (or resumes) a named stopwatch
docstring_summary: Starts (or resumes) a named stopwatch
docstring_tokens: Starts ( or resumes ) a named stopwatch
function: def start(key):
      ''' Starts (or resumes) a named stopwatch '''
      sw = get(key)
      if sw is None:
          sw = Stopwatch()
          put(key, sw)
          return sw
      else:
          sw.start()
function_tokens: def start ( key ) : sw = get ( key ) if sw is None : sw = Stopwatch ( ) put ( key , sw ) return sw else : sw . start ( )