Created
April 22, 2020 08:53
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Analysis of resulting size for different Python data types: dict, classes, classes with __slots__, namedtuples and dataclasses
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| Number of elements: 10 | |
| ----------------------- | |
| Dict: 360 bytes # 636 bytes | |
| Namedtuple: 120 bytes # 396 bytes | |
| Class: 48 bytes # 1202 bytes | |
| Class Slots: 48 bytes # 556 bytes | |
| Dataclass: 48 bytes # 468 bytes | |
| Number of elements: 100 | |
| ------------------------ | |
| Dict: 4696 bytes # 7492 bytes | |
| Namedtuple: 840 bytes # 3636 bytes | |
| Class: 48 bytes # 13586 bytes | |
| Class Slots: 48 bytes # 7540 bytes | |
| Dataclass: 48 bytes # 4268 bytes | |
| Number of elements: 1000 | |
| ------------------------- | |
| Dict: 36960 bytes # 64956 bytes | |
| Namedtuple: 8040 bytes # 36036 bytes | |
| Class: 48 bytes # 125950 bytes | |
| Class Slots: 48 bytes # 65004 bytes | |
| Dataclass: 48 bytes # 39028 bytes |
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| """ | |
| Analysis of resulting size for different Python data types. It was analyzed: | |
| - dict | |
| - classes | |
| - classes with __slots__ | |
| - dataclases | |
| - Namedtuples | |
| Author: Daniel García (cr0hn) | |
| Last update: 2020/22/04 | |
| Python version: 3.8 | |
| """ | |
| import sys | |
| from gc import get_referents | |
| from dataclasses import dataclass | |
| from collections import namedtuple | |
| from types import ModuleType, FunctionType | |
| # | |
| # This function was got from: https://stackoverflow.com/q/58675479/8153205 | |
| # | |
| # Custom objects know their class. | |
| # Function objects seem to know way too much, including modules. | |
| # Exclude modules as well. | |
| BLACKLIST = type, ModuleType, FunctionType | |
| def getsize(obj): | |
| """sum size of object & members.""" | |
| if isinstance(obj, BLACKLIST): | |
| raise TypeError( | |
| 'getsize() does not take argument of type: ' + str(type(obj))) | |
| seen_ids = set() | |
| size = 0 | |
| objects = [obj] | |
| while objects: | |
| need_referents = [] | |
| for obj in objects: | |
| if not isinstance(obj, BLACKLIST) and id(obj) not in seen_ids: | |
| seen_ids.add(id(obj)) | |
| size += sys.getsizeof(obj) | |
| need_referents.append(obj) | |
| objects = get_referents(*need_referents) | |
| return size | |
| # ------------------------------------------------------------------------- | |
| # Small | |
| # ------------------------------------------------------------------------- | |
| class Klass: | |
| def __init__(self, **kwargs): | |
| for x, y in kwargs.items(): | |
| setattr(self, x, y) | |
| @dataclass | |
| class DataKlass10: | |
| v0: str | |
| v1: str | |
| v2: str | |
| v3: str | |
| v4: str | |
| v5: str | |
| v6: str | |
| v7: str | |
| v8: str | |
| v9: str | |
| @dataclass | |
| class DataKlass100: | |
| v0: str | |
| v1: str | |
| v2: str | |
| v3: str | |
| v4: str | |
| v5: str | |
| v6: str | |
| v7: str | |
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| v10: str | |
| v11: str | |
| v12: str | |
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| v17: str | |
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| v20: str | |
| v21: str | |
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| v27: str | |
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| v30: str | |
| v31: str | |
| v32: str | |
| v33: str | |
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| v35: str | |
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| v95: str | |
| v96: str | |
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| v98: str | |
| v99: str | |
| @dataclass | |
| class DataKlass1000: | |
| v0: str | |
| v1: str | |
| v2: str | |
| v3: str | |
| v4: str | |
| v5: str | |
| v6: str | |
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| v677: str | |
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| v679: str | |
| v680: str | |
| v681: str | |
| v682: str | |
| v683: str | |
| v684: str | |
| v685: str | |
| v686: str | |
| v687: str | |
| v688: str | |
| v689: str | |
| v690: str | |
| v691: str | |
| v692: str | |
| v693: str | |
| v694: str | |
| v695: str | |
| v696: str | |
| v697: str | |
| v698: str | |
| v699: str | |
| v700: str | |
| v701: str | |
| v702: str | |
| v703: str | |
| v704: str | |
| v705: str | |
| v706: str | |
| v707: str | |
| v708: str | |
| v709: str | |
| v710: str | |
| v711: str | |
| v712: str | |
| v713: str | |
| v714: str | |
| v715: str | |
| v716: str | |
| v717: str | |
| v718: str | |
| v719: str | |
| v720: str | |
| v721: str | |
| v722: str | |
| v723: str | |
| v724: str | |
| v725: str | |
| v726: str | |
| v727: str | |
| v728: str | |
| v729: str | |
| v730: str | |
| v731: str | |
| v732: str | |
| v733: str | |
| v734: str | |
| v735: str | |
| v736: str | |
| v737: str | |
| v738: str | |
| v739: str | |
| v740: str | |
| v741: str | |
| v742: str | |
| v743: str | |
| v744: str | |
| v745: str | |
| v746: str | |
| v747: str | |
| v748: str | |
| v749: str | |
| v750: str | |
| v751: str | |
| v752: str | |
| v753: str | |
| v754: str | |
| v755: str | |
| v756: str | |
| v757: str | |
| v758: str | |
| v759: str | |
| v760: str | |
| v761: str | |
| v762: str | |
| v763: str | |
| v764: str | |
| v765: str | |
| v766: str | |
| v767: str | |
| v768: str | |
| v769: str | |
| v770: str | |
| v771: str | |
| v772: str | |
| v773: str | |
| v774: str | |
| v775: str | |
| v776: str | |
| v777: str | |
| v778: str | |
| v779: str | |
| v780: str | |
| v781: str | |
| v782: str | |
| v783: str | |
| v784: str | |
| v785: str | |
| v786: str | |
| v787: str | |
| v788: str | |
| v789: str | |
| v790: str | |
| v791: str | |
| v792: str | |
| v793: str | |
| v794: str | |
| v795: str | |
| v796: str | |
| v797: str | |
| v798: str | |
| v799: str | |
| v800: str | |
| v801: str | |
| v802: str | |
| v803: str | |
| v804: str | |
| v805: str | |
| v806: str | |
| v807: str | |
| v808: str | |
| v809: str | |
| v810: str | |
| v811: str | |
| v812: str | |
| v813: str | |
| v814: str | |
| v815: str | |
| v816: str | |
| v817: str | |
| v818: str | |
| v819: str | |
| v820: str | |
| v821: str | |
| v822: str | |
| v823: str | |
| v824: str | |
| v825: str | |
| v826: str | |
| v827: str | |
| v828: str | |
| v829: str | |
| v830: str | |
| v831: str | |
| v832: str | |
| v833: str | |
| v834: str | |
| v835: str | |
| v836: str | |
| v837: str | |
| v838: str | |
| v839: str | |
| v840: str | |
| v841: str | |
| v842: str | |
| v843: str | |
| v844: str | |
| v845: str | |
| v846: str | |
| v847: str | |
| v848: str | |
| v849: str | |
| v850: str | |
| v851: str | |
| v852: str | |
| v853: str | |
| v854: str | |
| v855: str | |
| v856: str | |
| v857: str | |
| v858: str | |
| v859: str | |
| v860: str | |
| v861: str | |
| v862: str | |
| v863: str | |
| v864: str | |
| v865: str | |
| v866: str | |
| v867: str | |
| v868: str | |
| v869: str | |
| v870: str | |
| v871: str | |
| v872: str | |
| v873: str | |
| v874: str | |
| v875: str | |
| v876: str | |
| v877: str | |
| v878: str | |
| v879: str | |
| v880: str | |
| v881: str | |
| v882: str | |
| v883: str | |
| v884: str | |
| v885: str | |
| v886: str | |
| v887: str | |
| v888: str | |
| v889: str | |
| v890: str | |
| v891: str | |
| v892: str | |
| v893: str | |
| v894: str | |
| v895: str | |
| v896: str | |
| v897: str | |
| v898: str | |
| v899: str | |
| v900: str | |
| v901: str | |
| v902: str | |
| v903: str | |
| v904: str | |
| v905: str | |
| v906: str | |
| v907: str | |
| v908: str | |
| v909: str | |
| v910: str | |
| v911: str | |
| v912: str | |
| v913: str | |
| v914: str | |
| v915: str | |
| v916: str | |
| v917: str | |
| v918: str | |
| v919: str | |
| v920: str | |
| v921: str | |
| v922: str | |
| v923: str | |
| v924: str | |
| v925: str | |
| v926: str | |
| v927: str | |
| v928: str | |
| v929: str | |
| v930: str | |
| v931: str | |
| v932: str | |
| v933: str | |
| v934: str | |
| v935: str | |
| v936: str | |
| v937: str | |
| v938: str | |
| v939: str | |
| v940: str | |
| v941: str | |
| v942: str | |
| v943: str | |
| v944: str | |
| v945: str | |
| v946: str | |
| v947: str | |
| v948: str | |
| v949: str | |
| v950: str | |
| v951: str | |
| v952: str | |
| v953: str | |
| v954: str | |
| v955: str | |
| v956: str | |
| v957: str | |
| v958: str | |
| v959: str | |
| v960: str | |
| v961: str | |
| v962: str | |
| v963: str | |
| v964: str | |
| v965: str | |
| v966: str | |
| v967: str | |
| v968: str | |
| v969: str | |
| v970: str | |
| v971: str | |
| v972: str | |
| v973: str | |
| v974: str | |
| v975: str | |
| v976: str | |
| v977: str | |
| v978: str | |
| v979: str | |
| v980: str | |
| v981: str | |
| v982: str | |
| v983: str | |
| v984: str | |
| v985: str | |
| v986: str | |
| v987: str | |
| v988: str | |
| v989: str | |
| v990: str | |
| v991: str | |
| v992: str | |
| v993: str | |
| v994: str | |
| v995: str | |
| v996: str | |
| v997: str | |
| v998: str | |
| v999: str | |
| DATACLASS = { | |
| "10": DataKlass10, | |
| "100": DataKlass100, | |
| "1000": DataKlass1000 | |
| } | |
| print("") | |
| for s in (10, 100, 1000): | |
| print("Number of elements: ", s) | |
| print("-" * (len(str(s)) + len("Number of elements: "))) | |
| print() | |
| info = {f"v{x}": x for x in range(s)} | |
| size_dict = dict(**info) | |
| _D = namedtuple("_D", list(info.keys())) | |
| size_namedtuple = _D(**info) | |
| _K = Klass(**info) | |
| _K.__slots__ = list(info.keys()) | |
| Klass2 = Klass | |
| Klass2.__slots__ = list(info.keys()) | |
| _K2 = Klass2(**info) | |
| dataclass = DATACLASS[str(s)](**info) | |
| print("Dict: ", sys.getsizeof(size_dict), "bytes #", getsize(size_dict), " bytes") | |
| print("Namedtuple: ", sys.getsizeof(size_namedtuple), "bytes #", | |
| getsize(size_namedtuple), " bytes") | |
| print("Class: ", sys.getsizeof(_K), "bytes #", getsize(_K), " bytes") | |
| print("Class Slots: ", sys.getsizeof(_K2), "bytes #", getsize(_K2), " bytes") | |
| print("Dataclass: ", sys.getsizeof(dataclass), "bytes #", getsize(dataclass), " bytes") | |
| print("") |
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