Does an IPython line magic exist for recording the output of a single line of code?

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No, there is no IPython line magic specifically designed for recording the output of a single line of code. However, you can use the %history magic command to view and save the output of previous commands, including the output of a single line of code.

To save the output of a single line of code, you can use the %history -l command followed by the line number of the command you want to save. For example, if you want to save the output of the second line of code in your command history, you would use the following command:

%history -l 2

This will display the output of the command and also save it to the clipboard. You can then paste the output into a text editor or other application for further processing.