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bpo-26806: add 30 to the recursion limit in IDLE's shell (pythonGH-13944)
This is done to compensate for the extra stack frames added by IDLE itself, which cause problems when setting the recursion limit to low values. This wraps sys.setrecursionlimit() and sys.getrecursionlimit() as invisibly as possible.
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‎Doc/library/idle.rst‎

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@@ -713,6 +713,10 @@ or ``print`` or ``write`` to sys.stdout or sys.stderr,
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IDLE should be started in a command line window. The secondary subprocess
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will then be attached to that window for input and output.
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The IDLE code running in the execution process adds frames to the call stack
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that would not be there otherwise. IDLE wraps ``sys.getrecursionlimit`` and
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``sys.setrecursionlimit`` to reduce the effect of the additional stack frames.
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If ``sys`` is reset by user code, such as with ``importlib.reload(sys)``,
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IDLE's changes are lost and input from the keyboard and output to the screen
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will not work correctly.

‎Lib/idlelib/NEWS.txt‎

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bpo-26806: To compensate for stack frames added by IDLE and avoid
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possible problems with low recursion limits, add 30 to limits in the
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user code execution process. Subtract 30 when reporting recursion
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limits to make this addition mostly transparent.
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bpo-37325: Fix tab focus traversal order for help source and custom
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run dialogs.
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