In-memory size of a Python structure

The recommendation from an earlier question on this was to use sys.getsizeof(), quoting:

>>> import sys
>>> x = 2
>>> sys.getsizeof(x)
14
>>> sys.getsizeof(sys.getsizeof)
32
>>> sys.getsizeof('this')
38
>>> sys.getsizeof('this also')
48

You could take this approach:

>>> import sys
>>> import decimal
>>> 
>>> d = {
...     "int": 0,
...     "float": 0.0,
...     "dict": dict(),
...     "set": set(),
...     "tuple": tuple(),
...     "list": list(),
...     "str": "a",
...     "unicode": u"a",
...     "decimal": decimal.Decimal(0),
...     "object": object(),
... }
>>> for k, v in sorted(d.iteritems()):
...     print k, sys.getsizeof(v)
...
decimal 40
dict 140
float 16
int 12
list 36
object 8
set 116
str 25
tuple 28
unicode 28

---

2012-09-30

python 2.7 (linux, 32-bit):

decimal 36
dict 136
float 16
int 12
list 32
object 8
set 112
str 22
tuple 24
unicode 32

python 3.3 (linux, 32-bit)

decimal 52
dict 144
float 16
int 14
list 32
object 8
set 112
str 26
tuple 24
unicode 26

---

2016-08-01

OSX, Python 2.7.10 (default, Oct 23 2015, 19:19:21) [GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.59.5)] on darwin

decimal 80
dict 280
float 24
int 24
list 72
object 16
set 232
str 38
tuple 56
unicode 52