[Python-checkins] python/nondist/sandbox/itertools libitertools.tex,1.13,1.14 test_itertools.py,1.9,1.10

[rhettinger@users.sourceforge.net]

Update of /cvsroot/python/python/nondist/sandbox/itertools
In directory sc8-pr-cvs1:/tmp/cvs-serv14741

Modified Files:
	libitertools.tex test_itertools.py 
Log Message:
More and improved examples

Index: libitertools.tex
===================================================================
RCS file: /cvsroot/python/python/nondist/sandbox/itertools/libitertools.tex,v
retrieving revision 1.13
retrieving revision 1.14
diff -C2 -d -r1.13 -r1.14
*** libitertools.tex	28 Jan 2003 02:02:25 -0000	1.13
--- libitertools.tex	29 Jan 2003 01:52:04 -0000	1.14
***************
*** 265,291 ****
  
  >>> import operator
! >>> bases = [2, 3, 5, 7]
! >>> powers = [2, 3, 4]
! >>> for power in powers:
! ...     print list(imap(operator.pow, bases, repeat(power)))
  ...
! [4, 9, 25, 49]
! [8, 27, 125, 343]
! [16, 81, 625, 2401]
  
  \end{verbatim}
  
  As a further example of how itertools can be combined, here
! are a few re-definitions of existing tools:
  
  \begin{verbatim}
! >>> def enumerate(s):
! ...     return izip(count(), s)
! >>> def tabulate(f):
! ...     return imap(f, count())
! >>> def iteritems(d):
! ...     return izip(d.iterkeys(), d.itervalues())
! >>> def nth(s, n):
! ...     return islice(n, n+1).next()
  
  \end{verbatim}
--- 265,305 ----
  
  >>> import operator
! >>> for cube in imap(operator.pow, xrange(1,4), repeat(3)):
! ...    print cube
  ...
! 1
! 8
! 27
! 
! >>> reportfile = ['EuroPython', 'Roster', '', 'alex', '', 'laura',
!                   '', 'martin', '', 'walter', '', 'samuele']
! >>> for name in islice(reportfile, 3, len(reportfile), 2):
! ...    print name.title()
! ...
! Alex
! Laura
! Martin
! Walter
! Samuele
  
  \end{verbatim}
  
  As a further example of how itertools can be combined, here
! are a few ways to define higher level tools:
  
  \begin{verbatim}
! >>> def enumerate(iterable):
! ...     return izip(count(), iterable)
! 
! >>> def tabulate(function):
! ...     "Return function(0), function(1), ..."
! ...     return imap(function, count())
! 
! >>> def iteritems(mapping):
! ...     return izip(mapping.iterkeys(), mapping.itervalues())
! 
! >>> def nth(iterable, n):
! ...     "Returns the nth item"
! ...     return islice(iterable, n, n+1).next()
  
  \end{verbatim}

Index: test_itertools.py
===================================================================
RCS file: /cvsroot/python/python/nondist/sandbox/itertools/test_itertools.py,v
retrieving revision 1.9
retrieving revision 1.10
diff -C2 -d -r1.9 -r1.10
*** test_itertools.py	28 Jan 2003 02:02:26 -0000	1.9
--- test_itertools.py	29 Jan 2003 01:52:04 -0000	1.10
***************
*** 100,122 ****
  
  >>> import operator
! >>> bases = [2, 3, 5, 7]
! >>> powers = [2, 3, 4]
! >>> for power in powers:
! ...     print list(imap(operator.pow, bases, repeat(power)))
  ...
! [4, 9, 25, 49]
! [8, 27, 125, 343]
! [16, 81, 625, 2401]
  
  
! >>> def enumerate(s):
! ...     return izip(count(), s)
! >>> def tabulate(f):
! ...     return imap(f, count())
! >>> def iteritems(d):
! ...     return izip(d.iterkeys(), d.itervalues())
! >>> def nth(s, n):
! ...     return islice(n, n+1).next()
  
  
  """
--- 100,134 ----
  
  >>> import operator
! >>> import operator
! >>> for cube in imap(operator.pow, xrange(1,4), repeat(3)):
! ...    print cube
  ...
! 1
! 8
! 27
! 
! >>> reportfile = ['EuroPython', 'Roster', '', 'alex', '', 'laura', '', 'martin', '', 'walter', '', 'samuele']
! >>> for name in islice(reportfile, 3, len(reportfile), 2):
! ...    print name.title()
! ...
! Alex
! Laura
! Martin
! Walter
! Samuele
  
+ >>> def enumerate(iterable):
+ ...     return izip(count(), iterable)
  
! >>> def tabulate(function):
! ...     "Return function(0), function(1), ..."
! ...     return imap(function, count())
! 
! >>> def iteritems(mapping):
! ...     return izip(mapping.iterkeys(), mapping.itervalues())
  
+ >>> def nth(iterable, n):
+ ...     "Returns the nth item"
+ ...     return islice(iterable, n, n+1).next()
  
  """