When trying to execute the example in the README:
using PyPlot
x = range(0; stop=2*pi, length=1000); y = sin.(3 * x + 4 * cos.(2 * x));
plot(x, y, color="red", linewidth=2.0, linestyle="--")
title("A sinusoidally modulated sinusoid")
I get the following error in Julia 1.4.2 and PyPlot v2.9.0
MethodError: no method matching py_linestyle(::Symbol, ::String)