[Python-checkins] python/dist/src/Doc/whatsnew whatsnew24.tex, 1.44, 1.45 (original) (raw)
rhettinger at users.sourceforge.net rhettinger at users.sourceforge.net
Wed May 19 15:45:21 EDT 2004
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Update of /cvsroot/python/python/dist/src/Doc/whatsnew In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv18118/Doc/whatsnew
Modified Files: whatsnew24.tex Log Message: Add more docs for generator expressions.
- Put in a brief, example driven tutorial entry.
- Use better examples in whatsnew24.tex.
Index: whatsnew24.tex
RCS file: /cvsroot/python/python/dist/src/Doc/whatsnew/whatsnew24.tex,v retrieving revision 1.44 retrieving revision 1.45 diff -C2 -d -r1.44 -r1.45 *** whatsnew24.tex 19 May 2004 08:20:04 -0000 1.44 --- whatsnew24.tex 19 May 2004 19:45:19 -0000 1.45
*** 126,130 **** \function{dict()}. These functions consume their data all at once and would not benefit from having a full list instead of a generator ! an input:
\begin{verbatim} --- 126,130 ---- \function{dict()}. These functions consume their data all at once and would not benefit from having a full list instead of a generator ! as an input:
\begin{verbatim}
*** 132,148 **** 285
! >>> sorted(set(i*i for i in xrange(-10, 11))) ! [0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100] ! ! >>> words = "Adam apple baker Bill Nancy NASA nut".split() ! >>> dict((word.lower(), word) for word in words) ! {'apple': 'apple', 'baker': 'baker', 'bill': 'Bill', 'nasa': 'NASA', ! 'adam': 'Adam', 'nancy': 'Nancy', 'nut': 'nut'}
xvec = [10, 20, 30] yvec = [7, 5, 3] ! >>> sum(x*y for x,y in itertools.izip(xvec, yvec)) # dot product 260
\end{verbatim}
--- 132,151 ---- 285
! >>> sorted(set(i*i for i in xrange(-20, 20) if i%2==1)) # odd squares ! [1, 9, 25, 49, 81, 121, 169, 225, 289, 361]
from itertools import izip xvec = [10, 20, 30] yvec = [7, 5, 3] ! >>> sum(x*y for x,y in izip(xvec, yvec)) # dot product 260
from math import pi, sin
sine_table = dict((x, sin(x*pi/180)) for x in xrange(0, 91))
unique_words = set(word for line in page for word in line.split())
valedictorian = max((student.gpa, student.name) for student in graduates)
\end{verbatim}
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