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� ��Wc @ s? d Z i e d 6Z e d � Z e d k r; e d e � n d S( s� Unpack tuple >>> t = (1, 2, 3) >>> a, b, c = t >>> a == 1 and b == 2 and c == 3 True Unpack list >>> l = [4, 5, 6] >>> a, b, c = l >>> a == 4 and b == 5 and c == 6 True Unpack implied tuple >>> a, b, c = 7, 8, 9 >>> a == 7 and b == 8 and c == 9 True Unpack string... fun! >>> a, b, c = 'one' >>> a == 'o' and b == 'n' and c == 'e' True Unpack generic sequence >>> class Seq: ... def __getitem__(self, i): ... if i >= 0 and i < 3: return i ... raise IndexError ... >>> a, b, c = Seq() >>> a == 0 and b == 1 and c == 2 True Single element unpacking, with extra syntax >>> st = (99,) >>> sl = [100] >>> a, = st >>> a 99 >>> b, = sl >>> b 100 Now for some failures Unpacking non-sequence >>> a, b, c = 7 Traceback (most recent call last): ... TypeError: 'int' object is not iterable Unpacking tuple of wrong size >>> a, b = t Traceback (most recent call last): ... ValueError: too many values to unpack Unpacking tuple of wrong size >>> a, b = l Traceback (most recent call last): ... ValueError: too many values to unpack Unpacking sequence too short >>> a, b, c, d = Seq() Traceback (most recent call last): ... ValueError: need more than 3 values to unpack Unpacking sequence too long >>> a, b = Seq() Traceback (most recent call last): ... ValueError: too many values to unpack Unpacking a sequence where the test for too long raises a different kind of error >>> class BozoError(Exception): ... pass ... >>> class BadSeq: ... def __getitem__(self, i): ... if i >= 0 and i < 3: ... return i ... elif i == 3: ... raise BozoError ... else: ... raise IndexError ... Trigger code while not expecting an IndexError (unpack sequence too long, wrong error) >>> a, b, c, d, e = BadSeq() Traceback (most recent call last): ... BozoError Trigger code while expecting an IndexError (unpack sequence too short, wrong error) >>> a, b, c = BadSeq() Traceback (most recent call last): ... BozoError t doctestsc C s4 d d l m } d d l m } | j | | � d S( Ni����( t test_support( t test_unpack( t testR R t run_doctest( t verboseR R ( ( si /builddir/build/BUILDROOT/imh-python-2.7.12-1.el7.x86_64/opt/imh-python/lib/python2.7/test/test_unpack.pyt test_main| s t __main__R N( R t __test__t FalseR t __name__t True( ( ( si /builddir/build/BUILDROOT/imh-python-2.7.12-1.el7.x86_64/opt/imh-python/lib/python2.7/test/test_unpack.pyt <module>x s
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