| 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="next" href="parenthesized.html" /> |
| 13 | <link rel="prev" href="atom-identifiers.html" /> |
| 14 | <link rel="parent" href="atoms.html" /> |
| 15 | <link rel="next" href="parenthesized.html" /> |
| 16 | <meta name='aesop' content='information' /> |
| 17 | <title>5.2.2 Literals</title> |
| 18 | </head> |
| 19 | <body> |
| 20 | <DIV CLASS="navigation"> |
| 21 | <div id='top-navigation-panel' xml:id='top-navigation-panel'> |
| 22 | <table align="center" width="100%" cellpadding="0" cellspacing="2"> |
| 23 | <tr> |
| 24 | <td class='online-navigation'><a rel="prev" title="5.2.1 Identifiers (Names)" |
| 25 | href="atom-identifiers.html"><img src='../icons/previous.png' |
| 26 | border='0' height='32' alt='Previous Page' width='32' /></A></td> |
| 27 | <td class='online-navigation'><a rel="parent" title="5.2 Atoms" |
| 28 | href="atoms.html"><img src='../icons/up.png' |
| 29 | border='0' height='32' alt='Up One Level' width='32' /></A></td> |
| 30 | <td class='online-navigation'><a rel="next" title="5.2.3 Parenthesized forms" |
| 31 | href="parenthesized.html"><img src='../icons/next.png' |
| 32 | border='0' height='32' alt='Next Page' width='32' /></A></td> |
| 33 | <td align="center" width="100%">Python Reference Manual</td> |
| 34 | <td class='online-navigation'><a rel="contents" title="Table of Contents" |
| 35 | href="contents.html"><img src='../icons/contents.png' |
| 36 | border='0' height='32' alt='Contents' width='32' /></A></td> |
| 37 | <td class='online-navigation'><img src='../icons/blank.png' |
| 38 | border='0' height='32' alt='' width='32' /></td> |
| 39 | <td class='online-navigation'><a rel="index" title="Index" |
| 40 | href="genindex.html"><img src='../icons/index.png' |
| 41 | border='0' height='32' alt='Index' width='32' /></A></td> |
| 42 | </tr></table> |
| 43 | <div class='online-navigation'> |
| 44 | <b class="navlabel">Previous:</b> |
| 45 | <a class="sectref" rel="prev" href="atom-identifiers.html">5.2.1 Identifiers (Names)</A> |
| 46 | <b class="navlabel">Up:</b> |
| 47 | <a class="sectref" rel="parent" href="atoms.html">5.2 Atoms</A> |
| 48 | <b class="navlabel">Next:</b> |
| 49 | <a class="sectref" rel="next" href="parenthesized.html">5.2.3 Parenthesized forms</A> |
| 50 | </div> |
| 51 | <hr /></div> |
| 52 | </DIV> |
| 53 | <!--End of Navigation Panel--> |
| 54 | |
| 55 | <H2><A NAME="SECTION007220000000000000000"></A><A NAME="atom-literals"></A> |
| 56 | <a id='l2h-337' xml:id='l2h-337'></a> |
| 57 | <BR> |
| 58 | 5.2.2 Literals |
| 59 | </H2> |
| 60 | |
| 61 | <P> |
| 62 | Python supports string literals and various numeric literals: |
| 63 | |
| 64 | <P> |
| 65 | <dl><dd class="grammar"> |
| 66 | <div class="productions"> |
| 67 | <table> |
| 68 | <tr> |
| 69 | <td><a id='tok-literal' xml:id='tok-literal'>literal</a></td> |
| 70 | <td>::=</td> |
| 71 | <td><a class='grammartoken' href="strings.html#tok-stringliteral">stringliteral</a> | <a class='grammartoken' href="integers.html#tok-integer">integer</a> | <a class='grammartoken' href="integers.html#tok-longinteger">longinteger</a></td></tr> |
| 72 | <tr> |
| 73 | <td></td> |
| 74 | <td></td> |
| 75 | <td><code>| <a class='grammartoken' href="floating.html#tok-floatnumber">floatnumber</a> | <a class='grammartoken' href="imaginary.html#tok-imagnumber">imagnumber</a></code></td></tr> |
| 76 | </table> |
| 77 | </div> |
| 78 | <a class="grammar-footer" |
| 79 | href="grammar.txt" type="text/plain" |
| 80 | >Download entire grammar as text.</a> |
| 81 | </dd></dl> |
| 82 | |
| 83 | <P> |
| 84 | Evaluation of a literal yields an object of the given type (string, |
| 85 | integer, long integer, floating point number, complex number) with the |
| 86 | given value. The value may be approximated in the case of floating |
| 87 | point and imaginary (complex) literals. See section <A href="literals.html#literals">2.4</A> |
| 88 | for details. |
| 89 | |
| 90 | <P> |
| 91 | All literals correspond to immutable data types, and hence the |
| 92 | object's identity is less important than its value. Multiple |
| 93 | evaluations of literals with the same value (either the same |
| 94 | occurrence in the program text or a different occurrence) may obtain |
| 95 | the same object or a different object with the same value. |
| 96 | <a id='l2h-338' xml:id='l2h-338'></a><a id='l2h-339' xml:id='l2h-339'></a> |
| 97 | <P> |
| 98 | |
| 99 | <DIV CLASS="navigation"> |
| 100 | <div class='online-navigation'> |
| 101 | <p></p><hr /> |
| 102 | <table align="center" width="100%" cellpadding="0" cellspacing="2"> |
| 103 | <tr> |
| 104 | <td class='online-navigation'><a rel="prev" title="5.2.1 Identifiers (Names)" |
| 105 | href="atom-identifiers.html"><img src='../icons/previous.png' |
| 106 | border='0' height='32' alt='Previous Page' width='32' /></A></td> |
| 107 | <td class='online-navigation'><a rel="parent" title="5.2 Atoms" |
| 108 | href="atoms.html"><img src='../icons/up.png' |
| 109 | border='0' height='32' alt='Up One Level' width='32' /></A></td> |
| 110 | <td class='online-navigation'><a rel="next" title="5.2.3 Parenthesized forms" |
| 111 | href="parenthesized.html"><img src='../icons/next.png' |
| 112 | border='0' height='32' alt='Next Page' width='32' /></A></td> |
| 113 | <td align="center" width="100%">Python Reference Manual</td> |
| 114 | <td class='online-navigation'><a rel="contents" title="Table of Contents" |
| 115 | href="contents.html"><img src='../icons/contents.png' |
| 116 | border='0' height='32' alt='Contents' width='32' /></A></td> |
| 117 | <td class='online-navigation'><img src='../icons/blank.png' |
| 118 | border='0' height='32' alt='' width='32' /></td> |
| 119 | <td class='online-navigation'><a rel="index" title="Index" |
| 120 | href="genindex.html"><img src='../icons/index.png' |
| 121 | border='0' height='32' alt='Index' width='32' /></A></td> |
| 122 | </tr></table> |
| 123 | <div class='online-navigation'> |
| 124 | <b class="navlabel">Previous:</b> |
| 125 | <a class="sectref" rel="prev" href="atom-identifiers.html">5.2.1 Identifiers (Names)</A> |
| 126 | <b class="navlabel">Up:</b> |
| 127 | <a class="sectref" rel="parent" href="atoms.html">5.2 Atoms</A> |
| 128 | <b class="navlabel">Next:</b> |
| 129 | <a class="sectref" rel="next" href="parenthesized.html">5.2.3 Parenthesized forms</A> |
| 130 | </div> |
| 131 | </div> |
| 132 | <hr /> |
| 133 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> |
| 134 | </DIV> |
| 135 | <!--End of Navigation Panel--> |
| 136 | <ADDRESS> |
| 137 | See <i><a href="about.html">About this document...</a></i> for information on suggesting changes. |
| 138 | </ADDRESS> |
| 139 | </BODY> |
| 140 | </HTML> |