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bpo-33000: Document that IDLE's shell has no line limit. (#10373)

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A program that runs indefinitely can overfill memory.
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Terry Jan Reedy 2018-11-06 23:55:06 -05:00 • committed by GitHub
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@ -648,14 +648,21 @@ will not work correctly.</p>
corresponding output device. When IDLE executes user code, <code class="docutils literal notranslate"><span class="pre">sys.stdout</span></code>
and <code class="docutils literal notranslate"><span class="pre">sys.stderr</span></code> are connected to the display area of IDLE’s Shell. Some of
its features are inherited from the underlying Tk Text widget. Others
are programmed additions.</p>
are programmed additions. Where it matters, Shell is designed for development
rather than production runs.</p>
<p>For instance, Shell never throws away output. A program that sends unlimited
output to Shell will eventually fill memory, resulting in a memory error.
In contrast, some system text windows only keep the last n lines of output.
A Windows console, for instance, keeps a user-settable 1 to 9999 lines,
with 300 the default.</p>
<p>Text widgets display a subset of Unicode, the Basic Multilingual Plane (BMP).
Which characters get a proper glyph instead of a replacement box depends on
the operating system and installed fonts. Newline characters cause following
text to appear on a new line, but other control characters are replaced
with a box. But note that the <code class="docutils literal notranslate"><span class="pre">repr()</span></code> function, which is used for
interactive echo of expression values, replaces control characters
with escape codes before they are output.</p>
text to appear on a new line, but other control characters are either
replaced with a box or deleted. However, <code class="docutils literal notranslate"><span class="pre">repr()</span></code>, which is used for
interactive echo of expression values, replaces control characters,
some BMP codepoints, and all non-BMP characters with escape codes
before they are output.</p>
<p>Normal and error output are generally kept separate (on separate lines)
from code input and each other. They each get different highlight colors.</p>
<p>For SyntaxError tracebacks, the normal ‘^’ marking where the error was