old_contents: import plotly as py
  import plotly.graph_objs as go
  from datetime import datetime
  from sys import argv
  
  import names
  from csvparser import parse
  
  data_file = argv[1]
  raw_data = parse(data_file)
  
  sleep_durations = []
  sleep_dates = []
  nap_durations = []
  nap_dates = []
  for date, rests in raw_data.items():
      sleep_total = nap_total = 0
      for r in rests:
          rest, wake, is_nap = r
          delta_h = (wake - rest).seconds / 3600
          if is_nap:
              nap_total += delta_h
          else:
              sleep_total += delta_h
  
      dt = datetime.combine(date, datetime.min.time())
      sleep_durations.append(sleep_total)
      sleep_dates.append(dt)
      nap_durations.append(nap_total)
      nap_dates.append(dt)
  
  dates = list(raw_data.keys())
  
  sleep_trace = go.Scatter(x=dates, y=sleep_durations, name='Sleep Duration')
  nap_trace = go.Scatter(x=dates, y=nap_durations, name='Nap Duration')
  
  data = go.Data([sleep_trace, nap_trace])
  layout = go.Layout(title=names.graph_title('Hours Slept per Day', dates),
                     yaxis={'title': 'Hours Slept', 'dtick': 1})
  figure = go.Figure(data=data, layout=layout)
  
  py.offline.plot(figure, filename=names.output_file_name(__file__, dates))
  
new_contents: import plotly as py
  import plotly.graph_objs as go
  from datetime import datetime
  from sys import argv
  
  import names
  from csvparser import parse
  
  data_file = argv[1]
  raw_data = parse(data_file)
  
  sleep_durations = []
  nap_durations = []
  for date, rests in raw_data.items():
      sleep_total = nap_total = 0
      for r in rests:
          rest, wake, is_nap = r
          delta_h = (wake - rest).seconds / 3600
          if is_nap:
              nap_total += delta_h
          else:
              sleep_total += delta_h
  
      dt = datetime.combine(date, datetime.min.time())
      sleep_durations.append(sleep_total)
      nap_durations.append(nap_total)
  
  dates = list(raw_data.keys())
  
  sleep_trace = go.Scatter(x=dates, y=sleep_durations, name='Sleep Duration')
  nap_trace = go.Scatter(x=dates, y=nap_durations, name='Nap Duration')
  
  data = go.Data([sleep_trace, nap_trace])
  layout = go.Layout(title=names.graph_title('Hours Slept per Day', dates),
                     yaxis={'title': 'Hours Slept', 'dtick': 1})
  figure = go.Figure(data=data, layout=layout)
  
  py.offline.plot(figure, filename=names.output_file_name(__file__, dates))
  
subject: Remove unused |date| array variables