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()
print_values¶
When using pygal to display static charts for printing for example you can chose to activate this option to print all values as text.
from pygal.style import DefaultStyle
chart = pygal.Bar(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()
print_zeroes¶
zero values are shown by default but you can use this option to hide them.
chart = pygal.Bar(print_values=True, print_zeroes=False)
chart.add('line', [0, 12, 31, 8, 28, 0])
chart.render()
print_labels¶
You can activate value label display:
chart = pygal.Bar(print_labels=True)
chart.add('line', [
0,
{'value': 12, 'label': 'Twelve'},
31,
{'value': 8, 'label': 'eight'},
28,
0
])
chart.render()
Displaying both is also possible:
chart = pygal.Bar(print_labels=True, print_values=True)
chart.add('line', [
0,
{'value': 12, 'label': 'Twelve'},
31,
{'value': 8, 'label': 'eight'},
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()