Where is the IPython output image?

Question

I tried to follow the examples at Quantum Circuit Plotting with SymPy but I could not find the output picture.

My OS is Ubuntu and I typed all the commands in the terminal of IPython, as you can see here:

The output is similar to the one in that website,

<sympy.physics.quantum.circuitplot.CircuitPlot object at 0x7fa125ee5c10>

So, where is the output figure? In some folder?

PS: I run again and get another similar but different output

<sympy.physics.quantum.circuitplot.CircuitPlot at 0x7f6ff0903690>

Answer 1

In all currently supported versions of Ubuntu open the terminal and type:

sudo apt install ipython python-sympy python-matplotlib # for Python 2.x in Ubuntu 18.04 and earlier

or

sudo apt install ipython3 python3-sympy python3-matplotlib # for Python 3.x 

Start the IPython interpreter with the --pylab option like this: ipython --pylab to enable showing the output plot as shown in the below screenshot. The Python code in the screenshot is identical to the code in the question.

^{X gate test}