Add source example files

source/plotting/plotly-pielabel.py

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+import pandas as pd
+from plotly import express as px
+
+data = pd.DataFrame(data={
+    "product": ["pomme", "poire", "banane", "pêche"],
+    "price": [1.99, 2.49, 2.99, 3.49], "wpu": [200, 180, 140, 200]
+})
+figure = px.pie(data, values="price", names="product", title="Prix")
+# Afficher le dernier graphique généré
+figure.layout.update({
+    "template": "seaborn",
+    "title": "Prix au kilo", "font": {"family": "Cabin", "size": 13},
+})
+figure.update_traces(**{"textinfo": "label+value", "texttemplate": "%{label}<br>%{value:.2f}€"})
+figure.show()