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Qc @ sN d Z d „ Z d „ Z d d d „ ƒ YZ d „ Z e d k rJ e ƒ n d S( s Example of a generator: re-implement the built-in range function
without actually constructing the list of values.
OldStyleRange is coded in the way required to work in a 'for' loop before
iterators were introduced into the language; using __getitem__ and __len__ .
c C sÞ yº t | ƒ d k r, d t | d ƒ d f St | ƒ d k r_ t | d ƒ t | d ƒ d f St | ƒ d k r¤ | d d k r t d ƒ ‚ n t d „ | Dƒ ƒ St d t | ƒ ƒ ‚ Wn t k
rÙ t d ƒ ‚ n Xd S(
sg Take list of arguments and extract/create proper start, stop, and step
values and return in a tuplei i i i s step argument must not be zeroc s s | ] } t | ƒ Vq d S( N( t int( t .0t x( ( s* /usr/lib64/python2.7/Demo/classes/Range.pys s s$ range() accepts 1-3 arguments, givensA range() arguments must be numbers or strings representing numbersN( t lenR t
ValueErrort tuplet TypeError( t arglist( ( s* /usr/lib64/python2.7/Demo/classes/Range.pyt
handleargs s !
c g sA t | ƒ \ } } } | } x | | k r< | V| | 7} q Wd S( s, Function to implement 'range' as a generatorN( R ( t at startt stopt stept value( ( s* /usr/lib64/python2.7/Demo/classes/Range.pyt genrange s
t oldrangec B s2 e Z d Z d „ Z d „ Z d „ Z d „ Z RS( s Class implementing a range object.
To the user the instances feel like immutable sequences
(and you can't concatenate or slice them)
Done using the old way (pre-iterators; __len__ and __getitem__) to have an
object be used by a 'for' loop.
c G sE t | ƒ \ | _ | _ | _ t d | j | j | j ƒ | _ d S( s„ Initialize start, stop, and step values along with calculating the
nubmer of values (what __len__ will return) in the rangei N( R R
R R t maxR ( t selfR ( ( s* /usr/lib64/python2.7/Demo/classes/Range.pyt __init__, s c C s d | j | j | j f S( s- implement repr(x) which is also used by prints range(%r, %r, %r)( R
R R ( R ( ( s* /usr/lib64/python2.7/Demo/classes/Range.pyt __repr__2 s c C s | j S( s implement len(x)( R ( R ( ( s* /usr/lib64/python2.7/Demo/classes/Range.pyt __len__6 s c C s> d | k o | j k n r1 | j | j | St d ‚ d S( s implement x[i]i s range[i] index out of rangeN( R R
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__module__t __doc__R R R R ( ( ( s* /usr/lib64/python2.7/Demo/classes/Range.pyR " s
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GHd S( Niÿÿÿÿi id i sE error in implementation:
correct = %s
old-style = %s
generator = %ss Timings for range(1000):iè s sec (old-style class)s sec (generator)s sec (built-in)( t timet __builtin__t ranget listR R t Exception(
R R t correct_resultt oldrange_resultt genrange_resultt t1R t t2t t3t t4( ( s* /usr/lib64/python2.7/Demo/classes/Range.pyt testB s*
t __main__N( ( R R R R R' R ( ( ( s* /usr/lib64/python2.7/Demo/classes/Range.pyt s