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Ka-Ping Yee <ping@lfw.org>: 

Further examples of list comprehensions.
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Fred Drake 2000-08-16 21:44:03 +00:00
parent 2d2785aad1
commit 1aebadf0e5
1 changed files with 10 additions and 6 deletions
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Doc/tut/tut.tex
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@ -1761,17 +1761,21 @@ 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']
>>> freshfruit = [' banana', ' loganberry ', 'passion fruit ']
>>> [weapon.strip() for weapon in freshfruit]
['banana', 'loganberry', 'passion fruit']
>>> vec = [2, 4, 6]
>>> print [3*x for x in vec]
>>> [3*x for x in vec]
[6, 12, 18]
>>> [3*x for x in vec if x > 3]
[12, 18]
>>> [3*x for x in vec if x < 2]
[]
>>> vec1 = [2, 4, 6]
>>> vec2 = [4, 3, -9]
>>> print [x*y for x in vec1 for y in vec2]
>>> [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]
>>> [x+y for x in vec1 for y in vec2]
[6, 5, -7, 8, 7, -5, 10, 9, -3]
\end{verbatim}