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author | Raymond Hettinger <python@rcn.com> | 2005-06-27 23:36:47 (GMT) |
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committer | Raymond Hettinger <python@rcn.com> | 2005-06-27 23:36:47 (GMT) |
commit | 5a34afb745f9279191d3220833193354fda18852 (patch) | |
tree | d855052fd1a66701548884c60ea94207b967cdf0 /Doc/tut/tut.tex | |
parent | 3e3b699adf8100347f87af5cf65e1345f49595ad (diff) | |
download | cpython-5a34afb745f9279191d3220833193354fda18852.zip cpython-5a34afb745f9279191d3220833193354fda18852.tar.gz cpython-5a34afb745f9279191d3220833193354fda18852.tar.bz2 |
* Show the keyword argument form of dict().
* Note that dict works with the "in" keyword.
Diffstat (limited to 'Doc/tut/tut.tex')
-rw-r--r-- | Doc/tut/tut.tex | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/Doc/tut/tut.tex b/Doc/tut/tut.tex index 48db9f9..40ced7c 100644 --- a/Doc/tut/tut.tex +++ b/Doc/tut/tut.tex @@ -2146,8 +2146,8 @@ value using a non-existent key. The \method{keys()} method of a dictionary object returns a list of all the keys used in the dictionary, in arbitrary order (if you want it sorted, just apply the \method{sort()} method to the list of keys). To -check whether a single key is in the dictionary, use the -\method{has_key()} method of the dictionary. +check whether a single key is in the dictionary, either use the dictionary's +\method{has_key()} method or the \keyword{in} keyword. Here is a small example using a dictionary: @@ -2166,6 +2166,8 @@ Here is a small example using a dictionary: ['guido', 'irv', 'jack'] >>> tel.has_key('guido') True +>>> 'guido' in tel +True \end{verbatim} The \function{dict()} constructor builds dictionaries directly from @@ -2183,6 +2185,14 @@ Later in the tutorial, we will learn about Generator Expressions which are even better suited for the task of supplying key-values pairs to the \function{dict()} constructor. +When the keys are simple strings, it is sometimes easier to specify +pairs using keyword arguments: + +\begin{verbatim} +>>> dict(sape=4139, guido=4127, jack=4098) +{'sape': 4139, 'jack': 4098, 'guido': 4127} +\end{verbatim} + \section{Looping Techniques \label{loopidioms}} |