Data

value_formatter

You can specifiy how the values are displayed on the tooltip using a lambda function. The code below shows the values to 2 decimal places.

chart = pygal.Line()
chart.add('line', [.070106781, 1.414213562, 3.141592654])
chart.value_formatter = lambda x: "%.2f" % x
chart.render()

x_value_formatter

Same on x axis for xy like charts:

chart = pygal.XY()
chart.add('line', [(12, 31), (8, 28), (89, 12)])
chart.x_value_formatter = lambda x:  '%s%%' % x
chart.render()

dynamic_print_values

Show print_values only on legend hover.

from pygal.style import DefaultStyle
chart = pygal.Bar(dynamic_print_values=True, style=DefaultStyle(
                  value_font_family='googlefont:Raleway',
                  value_font_size=30,
                  value_colors=('white',)))
chart.add('line', [0, 12, 31, 8, -28, 0])
chart.render()

human_readable

Display values in human readable form:

1 230 000 -> 1.23M
.00 098 7 -> 987µ
chart = pygal.Line(human_readable=True)
chart.add('line', [0, .0002, .0005, .00035])
chart.render()

no_data_text

Text to display instead of the graph when no data is supplied:

chart = pygal.Line()
chart.add('line', [])
chart.render()
from pygal.style import DefaultStyle
chart = pygal.Line(no_data_text='No result found',
                   style=DefaultStyle(no_data_font_size=40))
chart.add('line', [])
chart.render()