Commit | Line | Data |
---|---|---|
920dae64 AT |
1 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> |
2 | <html> | |
3 | <head> | |
4 | <link rel="STYLESHEET" href="ref.css" type='text/css' /> | |
5 | <link rel="SHORTCUT ICON" href="../icons/pyfav.png" type="image/png" /> | |
6 | <link rel='start' href='../index.html' title='Python Documentation Index' /> | |
7 | <link rel="first" href="ref.html" title='Python Reference Manual' /> | |
8 | <link rel='contents' href='contents.html' title="Contents" /> | |
9 | <link rel='index' href='genindex.html' title='Index' /> | |
10 | <link rel='last' href='about.html' title='About this document...' /> | |
11 | <link rel='help' href='about.html' title='About this document...' /> | |
12 | <link rel="prev" href="keywords.html" /> | |
13 | <link rel="parent" href="identifiers.html" /> | |
14 | <link rel="next" href="literals.html" /> | |
15 | <meta name='aesop' content='information' /> | |
16 | <title>2.3.2 Reserved classes of identifiers</title> | |
17 | </head> | |
18 | <body> | |
19 | <DIV CLASS="navigation"> | |
20 | <div id='top-navigation-panel' xml:id='top-navigation-panel'> | |
21 | <table align="center" width="100%" cellpadding="0" cellspacing="2"> | |
22 | <tr> | |
23 | <td class='online-navigation'><a rel="prev" title="2.3.1 Keywords" | |
24 | href="keywords.html"><img src='../icons/previous.png' | |
25 | border='0' height='32' alt='Previous Page' width='32' /></A></td> | |
26 | <td class='online-navigation'><a rel="parent" title="2.3 Identifiers and keywords" | |
27 | href="identifiers.html"><img src='../icons/up.png' | |
28 | border='0' height='32' alt='Up One Level' width='32' /></A></td> | |
29 | <td class='online-navigation'><a rel="next" title="2.4 Literals" | |
30 | href="literals.html"><img src='../icons/next.png' | |
31 | border='0' height='32' alt='Next Page' width='32' /></A></td> | |
32 | <td align="center" width="100%">Python Reference Manual</td> | |
33 | <td class='online-navigation'><a rel="contents" title="Table of Contents" | |
34 | href="contents.html"><img src='../icons/contents.png' | |
35 | border='0' height='32' alt='Contents' width='32' /></A></td> | |
36 | <td class='online-navigation'><img src='../icons/blank.png' | |
37 | border='0' height='32' alt='' width='32' /></td> | |
38 | <td class='online-navigation'><a rel="index" title="Index" | |
39 | href="genindex.html"><img src='../icons/index.png' | |
40 | border='0' height='32' alt='Index' width='32' /></A></td> | |
41 | </tr></table> | |
42 | <div class='online-navigation'> | |
43 | <b class="navlabel">Previous:</b> | |
44 | <a class="sectref" rel="prev" href="keywords.html">2.3.1 Keywords</A> | |
45 | <b class="navlabel">Up:</b> | |
46 | <a class="sectref" rel="parent" href="identifiers.html">2.3 Identifiers and keywords</A> | |
47 | <b class="navlabel">Next:</b> | |
48 | <a class="sectref" rel="next" href="literals.html">2.4 Literals</A> | |
49 | </div> | |
50 | <hr /></div> | |
51 | </DIV> | |
52 | <!--End of Navigation Panel--> | |
53 | ||
54 | <H2><A NAME="SECTION004320000000000000000"></A><A NAME="id-classes"></A> | |
55 | <BR> | |
56 | 2.3.2 Reserved classes of identifiers | |
57 | </H2> | |
58 | ||
59 | <P> | |
60 | Certain classes of identifiers (besides keywords) have special | |
61 | meanings. These classes are identified by the patterns of leading and | |
62 | trailing underscore characters: | |
63 | ||
64 | <P> | |
65 | <DL> | |
66 | <DT><STRONG><code>_*</code></STRONG></DT> | |
67 | <DD>Not imported by "<tt class="samp">from <var>module</var> import *</tt>". The special | |
68 | identifier "<tt class="samp">_</tt>" is used in the interactive interpreter to store | |
69 | the result of the last evaluation; it is stored in the | |
70 | <tt class="module">__builtin__</tt> module. When not in interactive mode, "<tt class="samp">_</tt>" has no special meaning and is not defined. | |
71 | See section <A href="import.html#import">6.12</A>, ``The <tt class="keyword">import</tt> statement.'' | |
72 | ||
73 | <P> | |
74 | <span class="note"><b class="label">Note:</b> | |
75 | The name "<tt class="samp">_</tt>" is often used in conjunction with | |
76 | internationalization; refer to the documentation for the | |
77 | <a class="ulink" href="../lib/module-gettext.html" | |
78 | ><tt class="module">gettext</tt> module</a> for more | |
79 | information on this convention.</span> | |
80 | ||
81 | <P> | |
82 | </DD> | |
83 | <DT><STRONG><code>__*__</code></STRONG></DT> | |
84 | <DD>System-defined names. These names are defined by the interpreter | |
85 | and its implementation (including the standard library); | |
86 | applications should not expect to define additional names using this | |
87 | convention. The set of names of this class defined by Python may be | |
88 | extended in future versions. | |
89 | See section <A href="specialnames.html#specialnames">3.3</A>, ``Special method names.'' | |
90 | ||
91 | <P> | |
92 | </DD> | |
93 | <DT><STRONG><code>__*</code></STRONG></DT> | |
94 | <DD>Class-private names. Names in this category, when used within the | |
95 | context of a class definition, are re-written to use a mangled form | |
96 | to help avoid name clashes between ``private'' attributes of base | |
97 | and derived classes. | |
98 | See section <A href="atom-identifiers.html#atom-identifiers">5.2.1</A>, ``Identifiers (Names).'' | |
99 | ||
100 | <P> | |
101 | </DD> | |
102 | </DL> | |
103 | ||
104 | <P> | |
105 | ||
106 | <DIV CLASS="navigation"> | |
107 | <div class='online-navigation'> | |
108 | <p></p><hr /> | |
109 | <table align="center" width="100%" cellpadding="0" cellspacing="2"> | |
110 | <tr> | |
111 | <td class='online-navigation'><a rel="prev" title="2.3.1 Keywords" | |
112 | href="keywords.html"><img src='../icons/previous.png' | |
113 | border='0' height='32' alt='Previous Page' width='32' /></A></td> | |
114 | <td class='online-navigation'><a rel="parent" title="2.3 Identifiers and keywords" | |
115 | href="identifiers.html"><img src='../icons/up.png' | |
116 | border='0' height='32' alt='Up One Level' width='32' /></A></td> | |
117 | <td class='online-navigation'><a rel="next" title="2.4 Literals" | |
118 | href="literals.html"><img src='../icons/next.png' | |
119 | border='0' height='32' alt='Next Page' width='32' /></A></td> | |
120 | <td align="center" width="100%">Python Reference Manual</td> | |
121 | <td class='online-navigation'><a rel="contents" title="Table of Contents" | |
122 | href="contents.html"><img src='../icons/contents.png' | |
123 | border='0' height='32' alt='Contents' width='32' /></A></td> | |
124 | <td class='online-navigation'><img src='../icons/blank.png' | |
125 | border='0' height='32' alt='' width='32' /></td> | |
126 | <td class='online-navigation'><a rel="index" title="Index" | |
127 | href="genindex.html"><img src='../icons/index.png' | |
128 | border='0' height='32' alt='Index' width='32' /></A></td> | |
129 | </tr></table> | |
130 | <div class='online-navigation'> | |
131 | <b class="navlabel">Previous:</b> | |
132 | <a class="sectref" rel="prev" href="keywords.html">2.3.1 Keywords</A> | |
133 | <b class="navlabel">Up:</b> | |
134 | <a class="sectref" rel="parent" href="identifiers.html">2.3 Identifiers and keywords</A> | |
135 | <b class="navlabel">Next:</b> | |
136 | <a class="sectref" rel="next" href="literals.html">2.4 Literals</A> | |
137 | </div> | |
138 | </div> | |
139 | <hr /> | |
140 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
141 | </DIV> | |
142 | <!--End of Navigation Panel--> | |
143 | <ADDRESS> | |
144 | See <i><a href="about.html">About this document...</a></i> for information on suggesting changes. | |
145 | </ADDRESS> | |
146 | </BODY> | |
147 | </HTML> |