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# Python test set -- part 3, built-in operations.
print('3. Operations')
print('XXX Mostly not yet implemented')
print('3.1 Dictionary lookups fail if __cmp__() raises an exception')
class BadDictKey:
def __hash__(self):
return hash(self.__class__)
def __eq__(self, other):
if isinstance(other, self.__class__):
print("raising error")
raise RuntimeError, "gotcha"
return other
d = {}
x1 = BadDictKey()
x2 = BadDictKey()
d[x1] = 1
for stmt in ['d[x2] = 2',
'z = d[x2]',
'x2 in d',
'd.get(x2)',
'd.setdefault(x2, 42)',
'd.pop(x2)',
'd.update({x2: 2})']:
try:
exec(stmt)
except RuntimeError:
print("%s: caught the RuntimeError outside" % (stmt,))
else:
print("%s: No exception passed through!" % (stmt,)) # old CPython behavior
# Dict resizing bug, found by Jack Jansen in 2.2 CVS development.
# This version got an assert failure in debug build, infinite loop in
# release build. Unfortunately, provoking this kind of stuff requires
# a mix of inserts and deletes hitting exactly the right hash codes in
# exactly the right order, and I can't think of a randomized approach
# that would be *likely* to hit a failing case in reasonable time.
d = {}
for i in range(5):
d[i] = i
for i in range(5):
del d[i]
for i in range(5, 9): # i==8 was the problem
d[i] = i
# Another dict resizing bug (SF bug #1456209).
# This caused Segmentation faults or Illegal instructions.
class X(object):
def __hash__(self):
return 5
def __eq__(self, other):
if resizing:
d.clear()
return False
d = {}
resizing = False
d[X()] = 1
d[X()] = 2
d[X()] = 3
d[X()] = 4
d[X()] = 5
# now trigger a resize
resizing = True
d[9] = 6
print('resize bugs not triggered.')
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