old_contents: #!/usr/bin/env python
  # visualize-examples.py
  
  import bitsets
  import bitsets.visualize
  
  ARGS = {'directory': 'visualize-output', 'format': 'pdf'}
  
  Four = bitsets.bitset('Four', (1, 2, 3, 4))
  
  bitsets.visualize.bitset(Four, render=True, **ARGS)
  
  bitsets.visualize.bitset(Four, member_label=True, render=True, **ARGS)
  
  Six = bitsets.bitset('Six', (1, 2, 3, 4, 5, 6))
  
  dot = bitsets.visualize.bitset(Six, member_label='iching', **ARGS)
  dot.graph_attr.update(ranksep='1.2', splines='false')
  dot.node_attr.update(shape='none', fontname='DejaVu Sans', fontsize='24')
  dot.render()
  
new_contents: #!/usr/bin/env python3
  # visualize-examples.py
  
  import bitsets
  import bitsets.visualize
  
  ARGS = {'directory': 'visualize-output', 'format': 'pdf'}
  
  Four = bitsets.bitset('Four', (1, 2, 3, 4))
  
  bitsets.visualize.bitset(Four, render=True, **ARGS)
  
  bitsets.visualize.bitset(Four, member_label=True, render=True, **ARGS)
  
  Six = bitsets.bitset('Six', (1, 2, 3, 4, 5, 6))
  
  dot = bitsets.visualize.bitset(Six, member_label='iching', **ARGS)
  dot.graph_attr.update(ranksep='1.2', splines='false')
  dot.node_attr.update(shape='none', fontname='DejaVu Sans', fontsize='24')
  dot.render()
  
subject: use python3 for shebang