import inspect
import gc
class Debug(object):
" Subclass for collection of debugging informations "
def __new__(cls, *a, **b):
# Get the frame where the instantiation came from
frame = inspect.stack()[1]
# Continue with __new__ in super objects
o = super(Debug, cls).__new__(cls, a, b)
# Save important frame infos in object
o.debug_call = list(frame[1:4]) + [frame[4][0]]
return o
def DebugInfo(self):
# Split our informations
file, line, module, source = self.debug_call
# Format informative output
return 'Object instantiated in file "%s", line %s, in %s: %s' % (
file,
line,
module,
source.strip() )
def DumpDebugObjects(title):
print "***", title, "***"
gc.collect()
for o in gc.get_objects():
if isinstance(o, Debug):
print o.DebugInfo()
if __name__=="__main__":
class Test(Debug):
def __init__(self, arg):
print "Test", arg
class Test2(Test):
pass
t1 = Test(1)
t2 = Test(2)
t3 = Test(3)
DumpDebugObjects("We expect 3 objects")
del t2
DumpDebugObjects("Now one less")
