Usage examples (command-line and programmatic use):

- Standard one-line sparkline
sparklines 3 1 4 1 5 9 2 6
>>> print(sparklines([3, 1, 4, 1, 5, 9, 2, 6])[0])
▃▁▄▁▄█▂▅

- Multi-line sparkline (n=2)
sparklines -n 2 3 1 4 1 5 9 2 6
>>> for line in sparklines([3, 1, 4, 1, 5, 9, 2, 6], num_lines=2): print(line)
     █ ▂
▅▁▇▁██▃█

- Multi-line sparkline (n=3)
sparklines -n 3 3 1 4 1 5 9 2 6
>>> for line in sparklines([3, 1, 4, 1, 5, 9, 2, 6], num_lines=3): print(line)
     █  
  ▂ ▄█ ▇
▇▁█▁██▄█

- Standard one-line sparkline with gap
sparklines 3 1 4 1 5 9 2 6 None 6 2 9 5 1 4 1 3
>>> print(sparklines([3, 1, 4, 1, 5, 9, 2, 6, None, 6, 2, 9, 5, 1, 4, 1, 3])[0])
▃▁▄▁▄█▂▅ ▅▂█▄▁▄▁▃
