plt.show()

[PaulSoderlind]

plt = pyimport("matplotlib.pyplot") works well and it's easy to create plots.

However, with plt.show() the figure window has to be closed manually in order to use the REPL again. Instead with plt.show(;block=false) the figure window is blank and Julia hangs. (Julia 1.7.2, Win 10 64).

Example:

plt = pyimport("matplotlib.pyplot")
fig = plt.figure()
plt.plot(1:10)
plt.show()

[cjdoris]

The behaviour with plt.show() is just how matplotlib behaves, even from the Python REPL.

To matplotlib in interactive mode, such as plt.show(block=false), you need to start an event loop to do the rendering in the background. See https://cjdoris.github.io/PythonCall.jl/stable/compat/#Event-loops.

[PaulSoderlind]

it seems as if something like this works:

PythonCall.event_loop_on(:pyqt5)
plt.ion()

fig1 = plt.figure()
plt.plot(1:10)
plt.show()
...and then more plots