PyXR

c:\python24\lib \ test \ test_operations.py



0001 # Python test set -- part 3, built-in operations.
0002 
0003 
0004 print '3. Operations'
0005 print 'XXX Mostly not yet implemented'
0006 
0007 
0008 print '3.1 Dictionary lookups succeed even if __cmp__() raises an exception'
0009 
0010 # SourceForge bug #112558:
0011 # http://sourceforge.net/bugs/?func=detailbug&bug_id=112558&group_id=5470
0012 
0013 class BadDictKey:
0014     already_printed_raising_error = 0
0015 
0016     def __hash__(self):
0017         return hash(self.__class__)
0018 
0019     def __cmp__(self, other):
0020         if isinstance(other, self.__class__):
0021             if not BadDictKey.already_printed_raising_error:
0022                 # How many times __cmp__ gets called depends on the hash
0023                 # code and the internals of the dict implementation; we
0024                 # know it will be called at least once, but that's it.
0025                 # already_printed_raising_error makes sure the expected-
0026                 # output file prints the msg at most once.
0027                 BadDictKey.already_printed_raising_error = 1
0028                 print "raising error"
0029             raise RuntimeError, "gotcha"
0030         return other
0031 
0032 d = {}
0033 x1 = BadDictKey()
0034 x2 = BadDictKey()
0035 d[x1] = 1
0036 d[x2] = 2
0037 print "No exception passed through."
0038 
0039 # Dict resizing bug, found by Jack Jansen in 2.2 CVS development.
0040 # This version got an assert failure in debug build, infinite loop in
0041 # release build.  Unfortunately, provoking this kind of stuff requires
0042 # a mix of inserts and deletes hitting exactly the right hash codes in
0043 # exactly the right order, and I can't think of a randomized approach
0044 # that would be *likely* to hit a failing case in reasonable time.
0045 
0046 d = {}
0047 for i in range(5):
0048     d[i] = i
0049 for i in range(5):
0050     del d[i]
0051 for i in range(5, 9):  # i==8 was the problem
0052     d[i] = i
0053 

Generated by PyXR 0.9.4
SourceForge.net Logo