[OpenSPARC-T2-SAM] / sam-t2 / devtools / amd64 / html / python / ref / dict.html

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<H2><A NAME="SECTION007260000000000000000"></A><A NAME="dict"></A>
<BR>
5.2.6 Dictionary displays
</H2>
<a id='l2h-352' xml:id='l2h-352'></a>
<P>
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>

<P>
<dl><dd class="grammar">
<div class="productions">
<table>
<tr>
    <td><a id='tok-dict_display' xml:id='tok-dict_display'>dict_display</a></td>
    <td>::=</td>
    <td>"{" [<a class='grammartoken' href="dict.html#tok-key_datum_list">key_datum_list</a>] "}"</td></tr>
  <tr>
    <td><a id='tok-key_datum_list' xml:id='tok-key_datum_list'>key_datum_list</a></td>
    <td>::=</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>
  <tr>
    <td><a id='tok-key_datum' xml:id='tok-key_datum'>key_datum</a></td>
    <td>::=</td>
    <td><a class='grammartoken' href="Booleans.html#tok-expression">expression</a> ":" <a class='grammartoken' href="Booleans.html#tok-expression">expression</a></td></tr>
</table>
</div>
<a class="grammar-footer"
  href="grammar.txt" type="text/plain"
  >Download entire grammar as text.</a>
</dd></dl>

<P>
A dictionary display yields a new dictionary object.
<a id='l2h-353' xml:id='l2h-353'></a>
<P>
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.

<P>
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>
<P>

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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...' />
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	13	<link rel="prev" href="genexpr.html" />
	14	<link rel="parent" href="atoms.html" />
	15	<link rel="next" href="string-conversions.html" />
	16	<meta name='aesop' content='information' />
	17	<title>5.2.6 Dictionary displays</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">
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	25	href="genexpr.html"><img src='../icons/previous.png'
	26	border='0' height='32' alt='Previous Page' width='32' /></A></td>
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	31	href="string-conversions.html"><img src='../icons/next.png'
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	33	<td align="center" width="100%">Python Reference Manual</td>
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	36	border='0' height='32' alt='Contents' width='32' /></A></td>
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	40	href="genindex.html"><img src='../icons/index.png'
	41	border='0' height='32' alt='Index' width='32' /></A></td>
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	44	<b class="navlabel">Previous:</b>
	45	<a class="sectref" rel="prev" href="genexpr.html">5.2.5 Generator expressions</A>
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	49	<a class="sectref" rel="next" href="string-conversions.html">5.2.7 String conversions</A>
	50	</div>
	51	<hr /></div>
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	53	<!--End of Navigation Panel-->
	54
	55	<H2><A NAME="SECTION007260000000000000000"></A><A NAME="dict"></A>
	56	<BR>
	57	5.2.6 Dictionary displays
	58	</H2>
	59	<a id='l2h-352' xml:id='l2h-352'></a>
	60	<P>
	61	A dictionary display is a possibly empty series of key/datum pairs
	62	enclosed in curly braces:
	63	<a id='l2h-355' xml:id='l2h-355'></a>
	64
65	<P>
66	<dl><dd class="grammar">
67	<div class="productions">
68	<table>
69	<tr>
70	<td><a id='tok-dict_display' xml:id='tok-dict_display'>dict_display</a></td>
71	<td>::=</td>
72	<td>"{" [<a class='grammartoken' href="dict.html#tok-key_datum_list">key_datum_list</a>] "}"</td></tr>
73	<tr>
74	<td><a id='tok-key_datum_list' xml:id='tok-key_datum_list'>key_datum_list</a></td>
75	<td>::=</td>
76	<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>
77	<tr>
78	<td><a id='tok-key_datum' xml:id='tok-key_datum'>key_datum</a></td>
79	<td>::=</td>
80	<td><a class='grammartoken' href="Booleans.html#tok-expression">expression</a> ":" <a class='grammartoken' href="Booleans.html#tok-expression">expression</a></td></tr>
81	</table>
82	</div>
83	<a class="grammar-footer"
84	href="grammar.txt" type="text/plain"
85	>Download entire grammar as text.</a>
86	</dd></dl>
87
88	<P>
89	A dictionary display yields a new dictionary object.
90	<a id='l2h-353' xml:id='l2h-353'></a>
91	<P>
92	The key/datum pairs are evaluated from left to right to define the
93	entries of the dictionary: each key object is used as a key into the
94	dictionary to store the corresponding datum.
95
96	<P>
97	Restrictions on the types of the key values are listed earlier in
98	section <A href="types.html#types">3.2</A>. (To summarize, the key type should be hashable,
99	which excludes all mutable objects.) Clashes between duplicate keys
100	are not detected; the last datum (textually rightmost in the display)
101	stored for a given key value prevails.
102	<a id='l2h-354' xml:id='l2h-354'></a>
103	<P>
104
105	<DIV CLASS="navigation">
106	<div class='online-navigation'>
107	<p></p><hr />
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109	<tr>
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111	href="genexpr.html"><img src='../icons/previous.png'
112	border='0' height='32' alt='Previous Page' width='32' /></A></td>
113	<td class='online-navigation'><a rel="parent" title="5.2 Atoms"
114	href="atoms.html"><img src='../icons/up.png'
115	border='0' height='32' alt='Up One Level' width='32' /></A></td>
116	<td class='online-navigation'><a rel="next" title="5.2.7 String conversions"
117	href="string-conversions.html"><img src='../icons/next.png'
118	border='0' height='32' alt='Next Page' width='32' /></A></td>
119	<td align="center" width="100%">Python Reference Manual</td>
120	<td class='online-navigation'><a rel="contents" title="Table of Contents"
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122	border='0' height='32' alt='Contents' width='32' /></A></td>
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124	border='0' height='32' alt='' width='32' /></td>
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126	href="genindex.html"><img src='../icons/index.png'
127	border='0' height='32' alt='Index' width='32' /></A></td>
128	</tr></table>
129	<div class='online-navigation'>
130	<b class="navlabel">Previous:</b>
131	<a class="sectref" rel="prev" href="genexpr.html">5.2.5 Generator expressions</A>
132	<b class="navlabel">Up:</b>
133	<a class="sectref" rel="parent" href="atoms.html">5.2 Atoms</A>
134	<b class="navlabel">Next:</b>
135	<a class="sectref" rel="next" href="string-conversions.html">5.2.7 String conversions</A>
136	</div>
137	</div>
138	<hr />
139	<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
140	</DIV>
141	<!--End of Navigation Panel-->
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143	See <i><a href="about.html">About this document...</a></i> for information on suggesting changes.
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