Hi,
in Jupyter one can use the python %%capture magic to redirect stdout, stderr into a variable. How do you do that in Julia with Juypter? I, most of the times, only have a pure Julia kernel running.
Maybe as a bonus: Is there a way to “tie” the output to a specific cell as well? I want to run asynchronous tasks and if I switch cells, they start to write into the standard output of other cells, which is somehow annoying 
Julia has built-in redirect_stdout /redirect_stderr. Do they suit your needs?
https://docs.julialang.org/en/v1/base/io-network/index.html#Base.redirect_stdout
I do not know how they work together with jupyter. I do not want to redirect ALL output, just the output of some code running in specific cells in a jupyter notebook.
Does anyone know, how that would be done?
let old_stdout = stdout
rd, = redirect_stdout()
try
println("This output is redirected.\n")
finally
redirect_stdout(old_stdout) # restore original stdout
end
output = String(readavailable(rd))
println("captured the output: ", output)
end
This looks promising! I will give this a try as soon as I can!
It’s harder than it should be, though. We should really have a capture_stdout() function in the standard library, so that you can do:
data = capture_stdout() do
...
end
String(data)
or similar. Or maybe
buf = IOBuffer()
redirect_stdout(buf) do
...
end
String(take!(buf))
See
That would be very nice! Especially if you want to hack something quickly together in a notebook 
https://github.com/JuliaIO/Suppressor.jl has an @capture_out macro, but in a Jupyter notebook cell it appeared to freeze forever for me with Julia 1.1.1,
Can you file an issue with Suppressor.jl?
I see you don’t pronounce the ‘at’ 
. I opened @capture_out hangs in Jupyter notebooks · Issue #31 · JuliaIO/Suppressor.jl · GitHub.