This error usually happens because your Raspberry Pi is running an older version of matplotlib. In itNavigationToolbar2Tk didn't exist yet — it was called NavigationToolbar2TkAgg.
Try

from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg

Unselfishness
If you want to use the new name (NavigationToolbar2Tk), update matplotlib:

pip3 install --upgrade matplotlib

But on a Pi 3 with Python 3.5, upgrading may be limited, so using NavigationToolbar2TkAgg is usually the simplest fix.














--- Ultima modifica di delion bart in data 2025-11-22 08:13:28 ---

--- Ultima modifica di delion bart in data 2025-11-22 08:13:55 ---