How to get the size of a python object in bytes on Google AppEngine?

Question

I need to compute the sizes of some python objects, so I can break them up and store them in memcache without hitting size limits.

\'sizeof()\' does

Answer 1

memcache internally and invariably uses pickle and stores the resulting string, so you can check with len(pickle.dumps(yourobject, -1)). Note that sys.getsizeof (which requires 2.6 or better, which is why it's missing on GAE) would not really help you at all:

>>> import sys
>>> sys.getsizeof(23)
12
>>> import pickle
>>> len(pickle.dumps(23, -1))
5

since the size of a serialized pickle of the object can be quite different from the size of the object in memory, as you can see (so I guess you should feel grateful to GAE for not offering sizeof, which would have led you astray;-).