I created a plot using the Matplotlib library in a Python script. But the call to
show does not display the plot in a GUI window.
The rendering of a plot to a file or display is controlled by the backend that is set in Matplotlib. You can check the current backend using:
import matplotlib matplotlib.get_backend()
I got the default backend as
Agg. The possible values for GUI backends on Linux are
Agg is not a GUI backend, nothing is being displayed.
I wanted to use the simple Tcl-Tk backend. So, I installed the necessary packages for Python:
$ sudo apt install tcl-dev tk-dev python-tk python3-tk
The backend is not set automatically after this. In my Python script, I set it explicitly:
import matplotlib matplotlib.rcParams["backend"] = "TkAgg"
The plot was displayed after this change.
However, this needs to be set immediately after the import line of Matplotlib and before importing
matplotlib.pyplot. Doing this in the import region of a Python script is quite ugly.
Instead, I like to switch the backend of the
matplotlib.pyplot object itself:
import matplotlib.pyplot as mplot mplot.switch_backend("TkAgg")
This too worked fine for me! 🙂
Tried with: Ubuntu 14.04