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Diffstat (limited to 'Doc/tut/tut.tex')
-rw-r--r-- | Doc/tut/tut.tex | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/Doc/tut/tut.tex b/Doc/tut/tut.tex index b53d6ea..f811932 100644 --- a/Doc/tut/tut.tex +++ b/Doc/tut/tut.tex @@ -1753,6 +1753,27 @@ item, then to the result and the next item, and so on. For example, 0 \end{verbatim} +\subsection{List Comprehensions} + +List comprehensions provide a concise way to create lists without resorting +to use of the \func{map()} or \func{filter()} functions. The resulting +construct tends often to be clearer than use of those functions. + +\begin{verbatim} +>>> spcs = [" Apple", " Banana ", "Coco nut "] +>>> print [s.strip() for s in spcs] +['Apple', 'Banana', 'Coco nut'] +>>> vec = [2, 4, 6] +>>> print [3*x for x in vec] +[6, 12, 18] +>>> vec1 = [2, 4, 6] +>>> vec2 = [4, 3, -9] +>>> print [x*y for x in vec1 for y in vec2] +[8, 6, -18, 16, 12, -36, 24, 18, -54] +>>> print [x+y for x in vec1 for y in vec2] +[6, 5, -7, 8, 7, -5, 10, 9, -3] +\end{verbatim} + \section{The \keyword{del} statement \label{del}} There is a way to remove an item from a list given its index instead |