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s> Return a set of requested and supported Python versions.
:param available: if set to `True`, return installed versions only,
if set to `False`, return requested versions that are not installed.
By default returns all requested versions.
:type available: bool
>>> sorted(get_requested_versions([(2, 5), (3, 0)]))
[(2, 7)]
>>> sorted(get_requested_versions('')) == sorted(SUPPORTED)
True
>>> sorted(get_requested_versions([None, None])) == sorted(SUPPORTED)
True
>>> get_requested_versions([(5, 0), None])
set([])
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St j | � } | s8 t d | � � n | j � } t | � j d � d k r� t d � | d j d � D� � } | | f Sd } } | d r� | d } n | d } | d } | r� t d � | j d � D� � n d } | rt d
� | j d � D� � n d } | rB| rB| | k rBt d | � � n | | f S( s� Return minimum and maximum Python version from given range.
>>> parse_vrange('2.4-')
((2, 4), None)
>>> parse_vrange('2.4-2.6')
((2, 4), (2, 6))
>>> parse_vrange('2.4-3.0')
((2, 4), (3, 0))
>>> parse_vrange('-2.7')
(None, (2, 7))
>>> parse_vrange('2.5')
((2, 5), (2, 5))
>>> parse_vrange('') == parse_vrange('-') == (None, None)
True
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>>> vrepr(([2, 7], [3, 2]))
['2.7', '3.2']
>>> vrepr(('2.6', '3.1'))
['2.6', '3.1']
>>> vrepr('2.7')
'2.7'
>>> vrepr((2, 7))
'2.7'
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R ( ( s& /usr/share/python/debpython/version.pys <genexpr>� s ( R R R R R t joint append( R' t resultt version( ( s& /usr/share/python/debpython/version.pyt vrepr� s
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d St d � | j d d � D� � d S( s� Return pair of integers that represent version.
>>> getver('2.5')
(2, 5)
>>> getver('2.6.4')
(2, 6)
>>> getver(None)
''
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c C s� g } g } x[ t | � D]M } t | t � r= t | � } n | t k rY | j | � q | j | � q W| j t | � � | r� | r� t | � S| S( s� Return sorted list of versions starting with default Python
version (if available) then list of suppored versions greater than default
one followed by reversed list of older versions.
List of versions sorted this way can be used in Depends field.
:param vrepr: return string represenatations of versions, by default the
same format is used as in :param:`versions`
>>> debsorted([(2, 6), (3, 1), (2, 5), (2, 4), (2, 7)])[0] == DEFAULT
True
>>> debsorted(('2.4', '3.2', '2.6', '2.7'))[-1]
(2, 4)
>>> debsorted(set([(2, 1), (2, 2)]))
[(2, 2), (2, 1)]
>>> debsorted([(2, 1), (2, 2)], return_str=True)
['2.2', '2.1']
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