On Fri, Feb 01, 2019 at 02:38:43PM -0600, Dan Sommers wrote:
> So why not turn that around? ksh (since way back when) and
> bash (since 2008, according to what I read somewhere online)
> have "co-processes," which allow you to run a command "in
> the background," and send commands and receive replies from
> it. So I tried it with Python, but it didn't work:
>
> $ coproc P3 { python3; }
> $ echo 'import sys; print(sys.version)' >&${P3[1]}
> $ read v <&${P3[0]}
> [the read command just waits forever]
This is another good example of the problem James was referring to in
the thread about clearer communication. Don't assume we all know what
coproc does.
> A pile of experiments and examples from web pages later, I
> think it's Python and not me. My example, with suitable
> changes to the literal in the echo command, works with sbcl
> and erl, but not python3. If I start python3 as follows:
What are sbcl and erl?
I'm guessing you don't mean antimony pentachloride and a municipality in
Austria. Possibly Steel Bank Common Lisp and Erlang? But I'm not
confident about that.
Does your example work with more well-known interpreted languages with
interactive interpreters such as Ruby, Lua, Javascript (outside of the
browser), etc?
--
Steve
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