A Windows console, for instance, keeps a user-settable 1 to 9999 lines,
with 300 the default.
-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 either
-replaced with a box or deleted. However, ``repr()``, 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.
+A Tk Text widget, and hence IDLE's Shell, displays characters (codepoints)
+in the the BMP (Basic Multilingual Plane) subset of Unicode.
+Which characters are displayed with a proper glyph and which with a
+replacement box depends on the operating system and installed fonts.
+Tab characters cause the following text to begin after
+the next tab stop. (They occur every 8 'characters').
+Newline characters cause following text to appear on a new line.
+Other control characters are ignored or displayed as a space, box, or
+something else, depending on the operating system and font.
+(Moving the text cursor through such output with arrow keys may exhibit
+some surprising spacing behavior.)
+
+.. code-block:: none
+
+ >>> s = 'a\tb\a<\x02><\r>\bc\nd'
+ >>> len(s)
+ 14
+ >>> s # Display repr(s)
+ 'a\tb\x07<\x02><\r>\x08c\nd'
+ >>> print(s, end='') # Display s as is.
+ # Result varies by OS and font. Try it.
+
+The ``repr`` function is used for interactive echo of expression
+values. It returns an altered version of the input string in which
+control codes, some BMP codepoints, and all non-BMP codepoints are
+replaced with escape codes. As demonstrated above, it allows one to
+identify the characters in a string, regardless of how they are displayed.
Normal and error output are generally kept separate (on separate lines)
from code input and each other. They each get different highlight colors.
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+ <title>IDLE — Python 3.8.0a1 documentation</title>
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- title="Search within Python 3.8.0a0 documentation"
+ title="Search within Python 3.8.0a1 documentation"
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- <a href="../index.html">3.8.0a0 Documentation</a> »
+ <a href="../index.html">3.8.0a1 Documentation</a> »
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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 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>A Tk Text widget, and hence IDLE’s Shell, displays characters (codepoints)
+in the the BMP (Basic Multilingual Plane) subset of Unicode.
+Which characters are displayed with a proper glyph and which with a
+replacement box depends on the operating system and installed fonts.
+Tab characters cause the following text to begin after
+the next tab stop. (They occur every 8 ‘characters’).
+Newline characters cause following text to appear on a new line.
+Other control characters are ignored or displayed as a space, box, or
+something else, depending on the operating system and font.
+(Moving the text cursor through such output with arrow keys may exhibit
+some surprising spacing behavior.)</p>
+<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>>>> s = 'a\tb\a<\x02><\r>\bc\nd'
+>>> len(s)
+14
+>>> s # Display repr(s)
+'a\tb\x07<\x02><\r>\x08c\nd'
+>>> print(s, end='') # Display s as is.
+# Result varies by OS and font. Try it.
+</pre></div>
+</div>
+<p>The <code class="docutils literal notranslate"><span class="pre">repr</span></code> function is used for interactive echo of expression
+values. It returns an altered version of the input string in which
+control codes, some BMP codepoints, and all non-BMP codepoints are
+replaced with escape codes. As demonstrated above, it allows one to
+identify the characters in a string, regardless of how they are displayed.</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
<li>
- <a href="../index.html">3.8.0a0 Documentation</a> »
+ <a href="../index.html">3.8.0a1 Documentation</a> »
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+ © <a href="../copyright.html">Copyright</a> 2001-2019, Python Software Foundation.
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- Last updated on Dec 28, 2018.
+ Last updated on Feb 08, 2019.
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