<!DOCTYPE html PUBLIC
"-//W3C//DTD HTML 4.0 Transitional//EN">
<link rel=
"STYLESHEET" href=
"ref.css" type='text/css'
/>
<link rel=
"SHORTCUT ICON" href=
"../icons/pyfav.png" type=
"image/png" />
<link rel='start' href='../index.html' title='Python Documentation Index'
/>
<link rel=
"first" href=
"ref.html" title='Python Reference Manual'
/>
<link rel='contents' href='contents.html'
title=
"Contents" />
<link rel='index' href='genindex.html' title='Index'
/>
<link rel='last' href='about.html' title='About this document...'
/>
<link rel='help' href='about.html' title='About this document...'
/>
<link rel=
"next" href=
"string-conversions.html" />
<link rel=
"prev" href=
"genexpr.html" />
<link rel=
"parent" href=
"atoms.html" />
<link rel=
"next" href=
"string-conversions.html" />
<meta name='aesop' content='information'
/>
<title>5.2.6 Dictionary displays
</title>
<div id='top-navigation-panel' xml:id='top-navigation-panel'
>
<table align=
"center" width=
"100%" cellpadding=
"0" cellspacing=
"2">
<td class='online-navigation'
><a rel=
"prev" title=
"5.2.5 Generator expressions"
href=
"genexpr.html"><img src='../icons/previous.png'
border='
0' height='
32' alt='Previous Page' width='
32'
/></A></td>
<td class='online-navigation'
><a rel=
"parent" title=
"5.2 Atoms"
href=
"atoms.html"><img src='../icons/up.png'
border='
0' height='
32' alt='Up One Level' width='
32'
/></A></td>
<td class='online-navigation'
><a rel=
"next" title=
"5.2.7 String conversions"
href=
"string-conversions.html"><img src='../icons/next.png'
border='
0' height='
32' alt='Next Page' width='
32'
/></A></td>
<td align=
"center" width=
"100%">Python Reference Manual
</td>
<td class='online-navigation'
><a rel=
"contents" title=
"Table of Contents"
href=
"contents.html"><img src='../icons/contents.png'
border='
0' height='
32' alt='Contents' width='
32'
/></A></td>
<td class='online-navigation'
><img src='../icons/blank.png'
border='
0' height='
32' alt='' width='
32'
/></td>
<td class='online-navigation'
><a rel=
"index" title=
"Index"
href=
"genindex.html"><img src='../icons/index.png'
border='
0' height='
32' alt='Index' width='
32'
/></A></td>
<div class='online-navigation'
>
<b class=
"navlabel">Previous:
</b>
<a class=
"sectref" rel=
"prev" href=
"genexpr.html">5.2.5 Generator expressions
</A>
<b class=
"navlabel">Up:
</b>
<a class=
"sectref" rel=
"parent" href=
"atoms.html">5.2 Atoms
</A>
<b class=
"navlabel">Next:
</b>
<a class=
"sectref" rel=
"next" href=
"string-conversions.html">5.2.7 String conversions
</A>
<!--End of Navigation Panel-->
<H2><A NAME=
"SECTION007260000000000000000"></A><A NAME=
"dict"></A>
5.2.6 Dictionary displays
<a id='l2h-
352' xml:id='l2h-
352'
></a>
A dictionary display is a possibly empty series of key/datum pairs
enclosed in curly braces:
<a id='l2h-
355' xml:id='l2h-
355'
></a>
<div class=
"productions">
<td><a id='tok-dict_display' xml:id='tok-dict_display'
>dict_display
</a></td>
<td>"{" [
<a class='grammartoken'
href=
"dict.html#tok-key_datum_list">key_datum_list
</a>]
"}"</td></tr>
<td><a id='tok-key_datum_list' xml:id='tok-key_datum_list'
>key_datum_list
</a></td>
<td><a class='grammartoken'
href=
"dict.html#tok-key_datum">key_datum
</a> (
"," <a class='grammartoken'
href=
"dict.html#tok-key_datum">key_datum
</a>)* [
","]
</td></tr>
<td><a id='tok-key_datum' xml:id='tok-key_datum'
>key_datum
</a></td>
<td><a class='grammartoken'
href=
"Booleans.html#tok-expression">expression
</a> ":" <a class='grammartoken'
href=
"Booleans.html#tok-expression">expression
</a></td></tr>
<a class=
"grammar-footer"
href=
"grammar.txt" type=
"text/plain"
>Download entire grammar as text.
</a>
A dictionary display yields a new dictionary object.
<a id='l2h-
353' xml:id='l2h-
353'
></a>
The key/datum pairs are evaluated from left to right to define the
entries of the dictionary: each key object is used as a key into the
dictionary to store the corresponding datum.
Restrictions on the types of the key values are listed earlier in
section
<A href=
"types.html#types">3.2</A>. (To summarize, the key type should be hashable,
which excludes all mutable objects.) Clashes between duplicate keys
are not detected; the last datum (textually rightmost in the display)
stored for a given key value prevails.
<a id='l2h-
354' xml:id='l2h-
354'
></a>
<div class='online-navigation'
>
<table align=
"center" width=
"100%" cellpadding=
"0" cellspacing=
"2">
<td class='online-navigation'
><a rel=
"prev" title=
"5.2.5 Generator expressions"
href=
"genexpr.html"><img src='../icons/previous.png'
border='
0' height='
32' alt='Previous Page' width='
32'
/></A></td>
<td class='online-navigation'
><a rel=
"parent" title=
"5.2 Atoms"
href=
"atoms.html"><img src='../icons/up.png'
border='
0' height='
32' alt='Up One Level' width='
32'
/></A></td>
<td class='online-navigation'
><a rel=
"next" title=
"5.2.7 String conversions"
href=
"string-conversions.html"><img src='../icons/next.png'
border='
0' height='
32' alt='Next Page' width='
32'
/></A></td>
<td align=
"center" width=
"100%">Python Reference Manual
</td>
<td class='online-navigation'
><a rel=
"contents" title=
"Table of Contents"
href=
"contents.html"><img src='../icons/contents.png'
border='
0' height='
32' alt='Contents' width='
32'
/></A></td>
<td class='online-navigation'
><img src='../icons/blank.png'
border='
0' height='
32' alt='' width='
32'
/></td>
<td class='online-navigation'
><a rel=
"index" title=
"Index"
href=
"genindex.html"><img src='../icons/index.png'
border='
0' height='
32' alt='Index' width='
32'
/></A></td>
<div class='online-navigation'
>
<b class=
"navlabel">Previous:
</b>
<a class=
"sectref" rel=
"prev" href=
"genexpr.html">5.2.5 Generator expressions
</A>
<b class=
"navlabel">Up:
</b>
<a class=
"sectref" rel=
"parent" href=
"atoms.html">5.2 Atoms
</A>
<b class=
"navlabel">Next:
</b>
<a class=
"sectref" rel=
"next" href=
"string-conversions.html">5.2.7 String conversions
</A>
<span class=
"release-info">Release
2.4.2, documentation updated on
28 September
2005.
</span>
<!--End of Navigation Panel-->
See
<i><a href=
"about.html">About this document...
</a></i> for information on suggesting changes.