From: Raymond Hettinger <python@rcn.com>
Date: Tue, 25 Jun 2002 15:02:31 +0000 (+0000)
Subject: Close bug 480337:  Dict used before dicts explained.  Added explanation
X-Git-Tag: v2.2.2b1~298
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=8dc23be0d2df51218d2c869c39871122ee002a6e;p=thirdparty%2FPython%2Fcpython.git

Close bug 480337:  Dict used before dicts explained.  Added explanation
and examples of the dict() constructor.
---

diff --git a/Doc/tut/tut.tex b/Doc/tut/tut.tex
index cd8b5c09ee8c..f45604b4c135 100644
--- a/Doc/tut/tut.tex
+++ b/Doc/tut/tut.tex
@@ -2023,6 +2023,18 @@ Here is a small example using a dictionary:
 1
 \end{verbatim}
 
+The \function{dict()} contructor builds dictionaries directly from
+lists of key-value pairs stored as tuples.  When the pairs form a
+pattern, list comprehensions can compactly specify the key-value list.
+
+\begin{verbatim}
+>>> dict([('sape', 4139), ('guido', 4127), ('jack', 4098)])
+{'sape': 4139, 'jack': 4098, 'guido': 4127}
+>>> dict([(x, x**2) for x in vec])     # use a list comprehension
+{2: 4, 4: 16, 6: 36}
+\end{verbatim}
+
+
 \section{More on Conditions \label{conditions}}
 
 The conditions used in \code{while} and \code{if} statements above can