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Showing content from https://vatlab.github.io/sos-docs/doc/user_guide/magic_use.html below:

magic_use

A subkernel will be started with the execution of a cell with the selected language. By default

• The name of the subkernel is the name of the language
• The Jupyter kernel for the language. If multiple kernels that support the same language are available, preference will be given to a kernel determined by SoS.
• The SoS language module for the selected language.
• A default color determined by SoS.

For example, the following cell starts subkernel Python3, with language Python3, kernel ipython, language module sos-python, and a default color determined by SoS.

Using the %use magic, you can start another session of the same language by specifying a separate subkernel with language name specified with option --language. A separate color is usually specified to differentiate two subkernels:

As you can see, the two Python3 kernels do not share variables:

And you can transfer variables from one kernel to another as usual:

Each language module supports one or more kerneles (e.g. kernel javascript, and nodejs for JavaScript) for one or more langauges (e.g. both MATLAB and Octave are supported by the sos-matlab langauge module). If there is a kernel that uses one of the supported languages but is not explicitly supported by SoS, you can use the --kernel option in combination with the --language option to link the kernel with the specific language module.

For example, if you have developed yet another kernel for javascript, you can link it with the sos-javascript language module with command

%use myjs --kernel myjs --language JavaScript

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