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doc: Note that guix shell should contain base language packages.

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* doc/guix.texi (Invoking guix shell): Explain that python must be included in
the invocation even if it is already available in the external environment.

Suggested-by: Skyler <skyvine@protonmail.com>
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Josselin Poiret 2023-03-30 22:42:10 +02:00
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doc/guix.texi
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@ -96,7 +96,7 @@ Copyright @copyright{} 2021 Domagoj Stolfa@*
Copyright @copyright{} 2021 Hui Lu@*
Copyright @copyright{} 2021 pukkamustard@*
Copyright @copyright{} 2021 Alice Brenon@*
Copyright @copyright{} 2021, 2022 Josselin Poiret@*
Copyright @copyright{} 2021-2023 Josselin Poiret@*
Copyright @copyright{} 2021, 2023 muradm@*
Copyright @copyright{} 2021, 2022 Andrew Tropin@*
Copyright @copyright{} 2021 Sarah Morgensen@*
@ -6271,6 +6271,14 @@ building or downloading any missing package, and runs the
guix shell python python-numpy -- python3
@end example
Note that it is necessary to include the main @code{python} package in
this command even if it is already installed into your environment.
This is so that the shell environment knows to set @env{PYTHONPATH} and
other related variables. The shell environment cannot check the
previously installed environment, because then it would be
non-deterministic. This is true for most libraries: their corresponding
language package should be included in the shell invocation.
@quotation Note
@cindex shebang, for @command{guix shell}
@command{guix shell} can be also be used as a script interpreter, also