Is there any method I can override that will allow me to use print statements / pdb / etc. to keep track of every time an instance of my class is allocated? While unpickling some objects I am seeming to get some that never have either __setstate__
or __init__
called on them. I tried overriding __new__
and printing out the id of every object I make in __new__
, but I am still encountering objects with ids that were never printed.
Edit: here is my code I use for altering (instrumenting) __new__
of my class and all of its super-classes except for object
itself:
class Allocator:
def __init__(self, my_class):
self.my_class = my_class
self.old_new = my_class.__new__
def new(self, * args, ** kargs):
rval = self.old_new(*args, ** kargs)
#rval = super(self.my_class,cls).__new__(cls)
print 'Made '+str(self.my_class)+' with id '+str(id(rval))
return rval
def replace_allocator(cls):
if cls == object:
return
setattr(cls,'__new__',Allocator(cls).new)
print cls.__base__
try:
for parent in cls.__base__:
replace_allocator(parent)
except:
replace_allocator(cls.__base__)
I call replace_allocator on my classes' parent class as soon as it is imported in the main script. My class has a custom __new__
to begin with, which also prints out the id.