[SOLVED] Why does my code not return an error but still doesn't create a window?

Why does my code not return an error but still doesn't create a window?

When I run this code it doesn't return error but doesn't create a window. Somebody please help.

import pygal as pyg

line_chart = pyg.HorizontalBar()
line_chart.title = 'Friends favorite pizza topping'
line_chart.add('olives', 24)
line_chart.add('TOMATO', 32)
line_chart.add('pepperoni', 42)
line_chart.add('mushroom', 0.5)
line_chart.add('other', 1.5)
line_chart.render()

Solution

It generates SVG data which you can assign to variable

 data = line_chart.render()

and use to embed in HTML or to save in file

 with open('image.svg', 'wb') as fh:  # need binary mode
     fh.write(data)

 line_chart.render_to_file('image.svg')

 line_chart.render_to_png('image.png')

and later you can open it in browser or viewer.

If you want to see it at once in web browser then you need

 line_chart.render_in_browser()

There are other render_.... to generate response for Flask and Django, etc.

Maybe if you use render() in jupyter notebook or Google Colab (which run in web browser) then it will display it at once.

import pygal as pyg

line_chart = pyg.HorizontalBar()
line_chart.title = 'Friends favorite pizza topping'
line_chart.add('olives', 24)
line_chart.add('TOMATO', 32)
line_chart.add('pepperoni', 42)
line_chart.add('mushroom', 0.5)
line_chart.add('other', 1.5)

data = line_chart.render(pretty_print=True)
print(data.decode())

with open('image.svg' 'wb') as fh:
    fh.write(data)
    
#line_chart.render_to_file('image.svg')
#line_chart.render_to_png('test.png')

line_chart.render_in browser()