Bad Chart

The Python graph gallery mainly aims to help people with the technical part of data visualisation: it provides the code allowing to realise the chart you need. This section is a bit

different. It aims to list the most common mistakes of dataviz. Indeed, learning what a bad chart is is probably the most efficient way to avoid them. For each example, I try to provide

a few propositions to correct or improve the figure, always with python. Data visualisation is a huge field, and this section just shows a minuscule part of its complexity.

Note:  this section is under construction. Drop me an email for any suggestion and please be indulgent!


A few resources list bad dataviz, not necessarily in python. It is a good idea to visit them if you want to improve your knowledge on data visualisation:



Pie charts

I am not a pie plot hater. There are a few rare case where they can be useful, and the general public is used to it. However, it is definitely not the best way to represent data, and is often the theatre of awful dataviz.

Spaghetti plot