code: def each(iterable = None, *, name = None, metric = call_default):
      
      if iterable is None:
          return _each_decorator(name, metric)
      else:
          return _do_each(iterable, name, metric)
docs: Measure time elapsed to produce each item of an iterable
  
      :arg iterable: any iterable
      :arg function metric: f(name, 1, time)
      :arg str name: name for the metric