In [10]:
a = [str(x) for x in range(1000)]
a
Out[10]:
['0',
'1',
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
'10',
'11',
'12',
'13',
'14',
'15',
'16',
'17',
'18',
'19',
'20',
'21',
'22',
'23',
'24',
'25',
'26',
'27',
'28',
'29',
'30',
'31',
'32',
'33',
'34',
'35',
'36',
'37',
'38',
'39',
'40',
'41',
'42',
'43',
'44',
'45',
'46',
'47',
'48',
'49',
'50',
'51',
'52',
'53',
'54',
'55',
'56',
'57',
'58',
'59',
'60',
'61',
'62',
'63',
'64',
'65',
'66',
'67',
'68',
'69',
'70',
'71',
'72',
'73',
'74',
'75',
'76',
'77',
'78',
'79',
'80',
'81',
'82',
'83',
'84',
'85',
'86',
'87',
'88',
'89',
'90',
'91',
'92',
'93',
'94',
'95',
'96',
'97',
'98',
'99',
'100',
'101',
'102',
'103',
'104',
'105',
'106',
'107',
'108',
'109',
'110',
'111',
'112',
'113',
'114',
'115',
'116',
'117',
'118',
'119',
'120',
'121',
'122',
'123',
'124',
'125',
'126',
'127',
'128',
'129',
'130',
'131',
'132',
'133',
'134',
'135',
'136',
'137',
'138',
'139',
'140',
'141',
'142',
'143',
'144',
'145',
'146',
'147',
'148',
'149',
'150',
'151',
'152',
'153',
'154',
'155',
'156',
'157',
'158',
'159',
'160',
'161',
'162',
'163',
'164',
'165',
'166',
'167',
'168',
'169',
'170',
'171',
'172',
'173',
'174',
'175',
'176',
'177',
'178',
'179',
'180',
'181',
'182',
'183',
'184',
'185',
'186',
'187',
'188',
'189',
'190',
'191',
'192',
'193',
'194',
'195',
'196',
'197',
'198',
'199',
'200',
'201',
'202',
'203',
'204',
'205',
'206',
'207',
'208',
'209',
'210',
'211',
'212',
'213',
'214',
'215',
'216',
'217',
'218',
'219',
'220',
'221',
'222',
'223',
'224',
'225',
'226',
'227',
'228',
'229',
'230',
'231',
'232',
'233',
'234',
'235',
'236',
'237',
'238',
'239',
'240',
'241',
'242',
'243',
'244',
'245',
'246',
'247',
'248',
'249',
'250',
'251',
'252',
'253',
'254',
'255',
'256',
'257',
'258',
'259',
'260',
'261',
'262',
'263',
'264',
'265',
'266',
'267',
'268',
'269',
'270',
'271',
'272',
'273',
'274',
'275',
'276',
'277',
'278',
'279',
'280',
'281',
'282',
'283',
'284',
'285',
'286',
'287',
'288',
'289',
'290',
'291',
'292',
'293',
'294',
'295',
'296',
'297',
'298',
'299',
'300',
'301',
'302',
'303',
'304',
'305',
'306',
'307',
'308',
'309',
'310',
'311',
'312',
'313',
'314',
'315',
'316',
'317',
'318',
'319',
'320',
'321',
'322',
'323',
'324',
'325',
'326',
'327',
'328',
'329',
'330',
'331',
'332',
'333',
'334',
'335',
'336',
'337',
'338',
'339',
'340',
'341',
'342',
'343',
'344',
'345',
'346',
'347',
'348',
'349',
'350',
'351',
'352',
'353',
'354',
'355',
'356',
'357',
'358',
'359',
'360',
'361',
'362',
'363',
'364',
'365',
'366',
'367',
'368',
'369',
'370',
'371',
'372',
'373',
'374',
'375',
'376',
'377',
'378',
'379',
'380',
'381',
'382',
'383',
'384',
'385',
'386',
'387',
'388',
'389',
'390',
'391',
'392',
'393',
'394',
'395',
'396',
'397',
'398',
'399',
'400',
'401',
'402',
'403',
'404',
'405',
'406',
'407',
'408',
'409',
'410',
'411',
'412',
'413',
'414',
'415',
'416',
'417',
'418',
'419',
'420',
'421',
'422',
'423',
'424',
'425',
'426',
'427',
'428',
'429',
'430',
'431',
'432',
'433',
'434',
'435',
'436',
'437',
'438',
'439',
'440',
'441',
'442',
'443',
'444',
'445',
'446',
'447',
'448',
'449',
'450',
'451',
'452',
'453',
'454',
'455',
'456',
'457',
'458',
'459',
'460',
'461',
'462',
'463',
'464',
'465',
'466',
'467',
'468',
'469',
'470',
'471',
'472',
'473',
'474',
'475',
'476',
'477',
'478',
'479',
'480',
'481',
'482',
'483',
'484',
'485',
'486',
'487',
'488',
'489',
'490',
'491',
'492',
'493',
'494',
'495',
'496',
'497',
'498',
'499',
'500',
'501',
'502',
'503',
'504',
'505',
'506',
'507',
'508',
'509',
'510',
'511',
'512',
'513',
'514',
'515',
'516',
'517',
'518',
'519',
'520',
'521',
'522',
'523',
'524',
'525',
'526',
'527',
'528',
'529',
'530',
'531',
'532',
'533',
'534',
'535',
'536',
'537',
'538',
'539',
'540',
'541',
'542',
'543',
'544',
'545',
'546',
'547',
'548',
'549',
'550',
'551',
'552',
'553',
'554',
'555',
'556',
'557',
'558',
'559',
'560',
'561',
'562',
'563',
'564',
'565',
'566',
'567',
'568',
'569',
'570',
'571',
'572',
'573',
'574',
'575',
'576',
'577',
'578',
'579',
'580',
'581',
'582',
'583',
'584',
'585',
'586',
'587',
'588',
'589',
'590',
'591',
'592',
'593',
'594',
'595',
'596',
'597',
'598',
'599',
'600',
'601',
'602',
'603',
'604',
'605',
'606',
'607',
'608',
'609',
'610',
'611',
'612',
'613',
'614',
'615',
'616',
'617',
'618',
'619',
'620',
'621',
'622',
'623',
'624',
'625',
'626',
'627',
'628',
'629',
'630',
'631',
'632',
'633',
'634',
'635',
'636',
'637',
'638',
'639',
'640',
'641',
'642',
'643',
'644',
'645',
'646',
'647',
'648',
'649',
'650',
'651',
'652',
'653',
'654',
'655',
'656',
'657',
'658',
'659',
'660',
'661',
'662',
'663',
'664',
'665',
'666',
'667',
'668',
'669',
'670',
'671',
'672',
'673',
'674',
'675',
'676',
'677',
'678',
'679',
'680',
'681',
'682',
'683',
'684',
'685',
'686',
'687',
'688',
'689',
'690',
'691',
'692',
'693',
'694',
'695',
'696',
'697',
'698',
'699',
'700',
'701',
'702',
'703',
'704',
'705',
'706',
'707',
'708',
'709',
'710',
'711',
'712',
'713',
'714',
'715',
'716',
'717',
'718',
'719',
'720',
'721',
'722',
'723',
'724',
'725',
'726',
'727',
'728',
'729',
'730',
'731',
'732',
'733',
'734',
'735',
'736',
'737',
'738',
'739',
'740',
'741',
'742',
'743',
'744',
'745',
'746',
'747',
'748',
'749',
'750',
'751',
'752',
'753',
'754',
'755',
'756',
'757',
'758',
'759',
'760',
'761',
'762',
'763',
'764',
'765',
'766',
'767',
'768',
'769',
'770',
'771',
'772',
'773',
'774',
'775',
'776',
'777',
'778',
'779',
'780',
'781',
'782',
'783',
'784',
'785',
'786',
'787',
'788',
'789',
'790',
'791',
'792',
'793',
'794',
'795',
'796',
'797',
'798',
'799',
'800',
'801',
'802',
'803',
'804',
'805',
'806',
'807',
'808',
'809',
'810',
'811',
'812',
'813',
'814',
'815',
'816',
'817',
'818',
'819',
'820',
'821',
'822',
'823',
'824',
'825',
'826',
'827',
'828',
'829',
'830',
'831',
'832',
'833',
'834',
'835',
'836',
'837',
'838',
'839',
'840',
'841',
'842',
'843',
'844',
'845',
'846',
'847',
'848',
'849',
'850',
'851',
'852',
'853',
'854',
'855',
'856',
'857',
'858',
'859',
'860',
'861',
'862',
'863',
'864',
'865',
'866',
'867',
'868',
'869',
'870',
'871',
'872',
'873',
'874',
'875',
'876',
'877',
'878',
'879',
'880',
'881',
'882',
'883',
'884',
'885',
'886',
'887',
'888',
'889',
'890',
'891',
'892',
'893',
'894',
'895',
'896',
'897',
'898',
'899',
'900',
'901',
'902',
'903',
'904',
'905',
'906',
'907',
'908',
'909',
'910',
'911',
'912',
'913',
'914',
'915',
'916',
'917',
'918',
'919',
'920',
'921',
'922',
'923',
'924',
'925',
'926',
'927',
'928',
'929',
'930',
'931',
'932',
'933',
'934',
'935',
'936',
'937',
'938',
'939',
'940',
'941',
'942',
'943',
'944',
'945',
'946',
'947',
'948',
'949',
'950',
'951',
'952',
'953',
'954',
'955',
'956',
'957',
'958',
'959',
'960',
'961',
'962',
'963',
'964',
'965',
'966',
'967',
'968',
'969',
'970',
'971',
'972',
'973',
'974',
'975',
'976',
'977',
'978',
'979',
'980',
'981',
'982',
'983',
'984',
'985',
'986',
'987',
'988',
'989',
'990',
'991',
'992',
'993',
'994',
'995',
'996',
'997',
'998',
'999']
In [11]:
def cast(lst):
b = map(int, lst)
c = list(b)
return c
%timeit cast(a)
print(cast(a))
10000 loops, best of 3: 150 µs per loop
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387, 388, 389, 390, 391, 392, 393, 394, 395, 396, 397, 398, 399, 400, 401, 402, 403, 404, 405, 406, 407, 408, 409, 410, 411, 412, 413, 414, 415, 416, 417, 418, 419, 420, 421, 422, 423, 424, 425, 426, 427, 428, 429, 430, 431, 432, 433, 434, 435, 436, 437, 438, 439, 440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450, 451, 452, 453, 454, 455, 456, 457, 458, 459, 460, 461, 462, 463, 464, 465, 466, 467, 468, 469, 470, 471, 472, 473, 474, 475, 476, 477, 478, 479, 480, 481, 482, 483, 484, 485, 486, 487, 488, 489, 490, 491, 492, 493, 494, 495, 496, 497, 498, 499, 500, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517, 518, 519, 520, 521, 522, 523, 524, 525, 526, 527, 528, 529, 530, 531, 532, 533, 534, 535, 536, 537, 538, 539, 540, 541, 542, 543, 544, 545, 546, 547, 548, 549, 550, 551, 552, 553, 554, 555, 556, 557, 558, 559, 560, 561, 562, 563, 564, 565, 566, 567, 568, 569, 570, 571, 572, 573, 574, 575, 576, 577, 578, 579, 580, 581, 582, 583, 584, 585, 586, 587, 588, 589, 590, 591, 592, 593, 594, 595, 596, 597, 598, 599, 600, 601, 602, 603, 604, 605, 606, 607, 608, 609, 610, 611, 612, 613, 614, 615, 616, 617, 618, 619, 620, 621, 622, 623, 624, 625, 626, 627, 628, 629, 630, 631, 632, 633, 634, 635, 636, 637, 638, 639, 640, 641, 642, 643, 644, 645, 646, 647, 648, 649, 650, 651, 652, 653, 654, 655, 656, 657, 658, 659, 660, 661, 662, 663, 664, 665, 666, 667, 668, 669, 670, 671, 672, 673, 674, 675, 676, 677, 678, 679, 680, 681, 682, 683, 684, 685, 686, 687, 688, 689, 690, 691, 692, 693, 694, 695, 696, 697, 698, 699, 700, 701, 702, 703, 704, 705, 706, 707, 708, 709, 710, 711, 712, 713, 714, 715, 716, 717, 718, 719, 720, 721, 722, 723, 724, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736, 737, 738, 739, 740, 741, 742, 743, 744, 745, 746, 747, 748, 749, 750, 751, 752, 753, 754, 755, 756, 757, 758, 759, 760, 761, 762, 763, 764, 765, 766, 767, 768, 769, 770, 771, 772, 773, 774, 775, 776, 777, 778, 779, 780, 781, 782, 783, 784, 785, 786, 787, 788, 789, 790, 791, 792, 793, 794, 795, 796, 797, 798, 799, 800, 801, 802, 803, 804, 805, 806, 807, 808, 809, 810, 811, 812, 813, 814, 815, 816, 817, 818, 819, 820, 821, 822, 823, 824, 825, 826, 827, 828, 829, 830, 831, 832, 833, 834, 835, 836, 837, 838, 839, 840, 841, 842, 843, 844, 845, 846, 847, 848, 849, 850, 851, 852, 853, 854, 855, 856, 857, 858, 859, 860, 861, 862, 863, 864, 865, 866, 867, 868, 869, 870, 871, 872, 873, 874, 875, 876, 877, 878, 879, 880, 881, 882, 883, 884, 885, 886, 887, 888, 889, 890, 891, 892, 893, 894, 895, 896, 897, 898, 899, 900, 901, 902, 903, 904, 905, 906, 907, 908, 909, 910, 911, 912, 913, 914, 915, 916, 917, 918, 919, 920, 921, 922, 923, 924, 925, 926, 927, 928, 929, 930, 931, 932, 933, 934, 935, 936, 937, 938, 939, 940, 941, 942, 943, 944, 945, 946, 947, 948, 949, 950, 951, 952, 953, 954, 955, 956, 957, 958, 959, 960, 961, 962, 963, 964, 965, 966, 967, 968, 969, 970, 971, 972, 973, 974, 975, 976, 977, 978, 979, 980, 981, 982, 983, 984, 985, 986, 987, 988, 989, 990, 991, 992, 993, 994, 995, 996, 997, 998, 999]
In [13]:
def cast2(lst):
b = [int(x) for x in lst]
return b
%timeit cast2(a)
print(cast2(a))
1000 loops, best of 3: 203 µs per loop
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387, 388, 389, 390, 391, 392, 393, 394, 395, 396, 397, 398, 399, 400, 401, 402, 403, 404, 405, 406, 407, 408, 409, 410, 411, 412, 413, 414, 415, 416, 417, 418, 419, 420, 421, 422, 423, 424, 425, 426, 427, 428, 429, 430, 431, 432, 433, 434, 435, 436, 437, 438, 439, 440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450, 451, 452, 453, 454, 455, 456, 457, 458, 459, 460, 461, 462, 463, 464, 465, 466, 467, 468, 469, 470, 471, 472, 473, 474, 475, 476, 477, 478, 479, 480, 481, 482, 483, 484, 485, 486, 487, 488, 489, 490, 491, 492, 493, 494, 495, 496, 497, 498, 499, 500, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517, 518, 519, 520, 521, 522, 523, 524, 525, 526, 527, 528, 529, 530, 531, 532, 533, 534, 535, 536, 537, 538, 539, 540, 541, 542, 543, 544, 545, 546, 547, 548, 549, 550, 551, 552, 553, 554, 555, 556, 557, 558, 559, 560, 561, 562, 563, 564, 565, 566, 567, 568, 569, 570, 571, 572, 573, 574, 575, 576, 577, 578, 579, 580, 581, 582, 583, 584, 585, 586, 587, 588, 589, 590, 591, 592, 593, 594, 595, 596, 597, 598, 599, 600, 601, 602, 603, 604, 605, 606, 607, 608, 609, 610, 611, 612, 613, 614, 615, 616, 617, 618, 619, 620, 621, 622, 623, 624, 625, 626, 627, 628, 629, 630, 631, 632, 633, 634, 635, 636, 637, 638, 639, 640, 641, 642, 643, 644, 645, 646, 647, 648, 649, 650, 651, 652, 653, 654, 655, 656, 657, 658, 659, 660, 661, 662, 663, 664, 665, 666, 667, 668, 669, 670, 671, 672, 673, 674, 675, 676, 677, 678, 679, 680, 681, 682, 683, 684, 685, 686, 687, 688, 689, 690, 691, 692, 693, 694, 695, 696, 697, 698, 699, 700, 701, 702, 703, 704, 705, 706, 707, 708, 709, 710, 711, 712, 713, 714, 715, 716, 717, 718, 719, 720, 721, 722, 723, 724, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736, 737, 738, 739, 740, 741, 742, 743, 744, 745, 746, 747, 748, 749, 750, 751, 752, 753, 754, 755, 756, 757, 758, 759, 760, 761, 762, 763, 764, 765, 766, 767, 768, 769, 770, 771, 772, 773, 774, 775, 776, 777, 778, 779, 780, 781, 782, 783, 784, 785, 786, 787, 788, 789, 790, 791, 792, 793, 794, 795, 796, 797, 798, 799, 800, 801, 802, 803, 804, 805, 806, 807, 808, 809, 810, 811, 812, 813, 814, 815, 816, 817, 818, 819, 820, 821, 822, 823, 824, 825, 826, 827, 828, 829, 830, 831, 832, 833, 834, 835, 836, 837, 838, 839, 840, 841, 842, 843, 844, 845, 846, 847, 848, 849, 850, 851, 852, 853, 854, 855, 856, 857, 858, 859, 860, 861, 862, 863, 864, 865, 866, 867, 868, 869, 870, 871, 872, 873, 874, 875, 876, 877, 878, 879, 880, 881, 882, 883, 884, 885, 886, 887, 888, 889, 890, 891, 892, 893, 894, 895, 896, 897, 898, 899, 900, 901, 902, 903, 904, 905, 906, 907, 908, 909, 910, 911, 912, 913, 914, 915, 916, 917, 918, 919, 920, 921, 922, 923, 924, 925, 926, 927, 928, 929, 930, 931, 932, 933, 934, 935, 936, 937, 938, 939, 940, 941, 942, 943, 944, 945, 946, 947, 948, 949, 950, 951, 952, 953, 954, 955, 956, 957, 958, 959, 960, 961, 962, 963, 964, 965, 966, 967, 968, 969, 970, 971, 972, 973, 974, 975, 976, 977, 978, 979, 980, 981, 982, 983, 984, 985, 986, 987, 988, 989, 990, 991, 992, 993, 994, 995, 996, 997, 998, 999]
In [14]:
def cast3(lst):
for idx, x in enumerate(lst):
lst[idx] = int(x)
return lst
%timeit cast3(a)
print(cast3(a))
10000 loops, best of 3: 186 µs per loop
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387, 388, 389, 390, 391, 392, 393, 394, 395, 396, 397, 398, 399, 400, 401, 402, 403, 404, 405, 406, 407, 408, 409, 410, 411, 412, 413, 414, 415, 416, 417, 418, 419, 420, 421, 422, 423, 424, 425, 426, 427, 428, 429, 430, 431, 432, 433, 434, 435, 436, 437, 438, 439, 440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450, 451, 452, 453, 454, 455, 456, 457, 458, 459, 460, 461, 462, 463, 464, 465, 466, 467, 468, 469, 470, 471, 472, 473, 474, 475, 476, 477, 478, 479, 480, 481, 482, 483, 484, 485, 486, 487, 488, 489, 490, 491, 492, 493, 494, 495, 496, 497, 498, 499, 500, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517, 518, 519, 520, 521, 522, 523, 524, 525, 526, 527, 528, 529, 530, 531, 532, 533, 534, 535, 536, 537, 538, 539, 540, 541, 542, 543, 544, 545, 546, 547, 548, 549, 550, 551, 552, 553, 554, 555, 556, 557, 558, 559, 560, 561, 562, 563, 564, 565, 566, 567, 568, 569, 570, 571, 572, 573, 574, 575, 576, 577, 578, 579, 580, 581, 582, 583, 584, 585, 586, 587, 588, 589, 590, 591, 592, 593, 594, 595, 596, 597, 598, 599, 600, 601, 602, 603, 604, 605, 606, 607, 608, 609, 610, 611, 612, 613, 614, 615, 616, 617, 618, 619, 620, 621, 622, 623, 624, 625, 626, 627, 628, 629, 630, 631, 632, 633, 634, 635, 636, 637, 638, 639, 640, 641, 642, 643, 644, 645, 646, 647, 648, 649, 650, 651, 652, 653, 654, 655, 656, 657, 658, 659, 660, 661, 662, 663, 664, 665, 666, 667, 668, 669, 670, 671, 672, 673, 674, 675, 676, 677, 678, 679, 680, 681, 682, 683, 684, 685, 686, 687, 688, 689, 690, 691, 692, 693, 694, 695, 696, 697, 698, 699, 700, 701, 702, 703, 704, 705, 706, 707, 708, 709, 710, 711, 712, 713, 714, 715, 716, 717, 718, 719, 720, 721, 722, 723, 724, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736, 737, 738, 739, 740, 741, 742, 743, 744, 745, 746, 747, 748, 749, 750, 751, 752, 753, 754, 755, 756, 757, 758, 759, 760, 761, 762, 763, 764, 765, 766, 767, 768, 769, 770, 771, 772, 773, 774, 775, 776, 777, 778, 779, 780, 781, 782, 783, 784, 785, 786, 787, 788, 789, 790, 791, 792, 793, 794, 795, 796, 797, 798, 799, 800, 801, 802, 803, 804, 805, 806, 807, 808, 809, 810, 811, 812, 813, 814, 815, 816, 817, 818, 819, 820, 821, 822, 823, 824, 825, 826, 827, 828, 829, 830, 831, 832, 833, 834, 835, 836, 837, 838, 839, 840, 841, 842, 843, 844, 845, 846, 847, 848, 849, 850, 851, 852, 853, 854, 855, 856, 857, 858, 859, 860, 861, 862, 863, 864, 865, 866, 867, 868, 869, 870, 871, 872, 873, 874, 875, 876, 877, 878, 879, 880, 881, 882, 883, 884, 885, 886, 887, 888, 889, 890, 891, 892, 893, 894, 895, 896, 897, 898, 899, 900, 901, 902, 903, 904, 905, 906, 907, 908, 909, 910, 911, 912, 913, 914, 915, 916, 917, 918, 919, 920, 921, 922, 923, 924, 925, 926, 927, 928, 929, 930, 931, 932, 933, 934, 935, 936, 937, 938, 939, 940, 941, 942, 943, 944, 945, 946, 947, 948, 949, 950, 951, 952, 953, 954, 955, 956, 957, 958, 959, 960, 961, 962, 963, 964, 965, 966, 967, 968, 969, 970, 971, 972, 973, 974, 975, 976, 977, 978, 979, 980, 981, 982, 983, 984, 985, 986, 987, 988, 989, 990, 991, 992, 993, 994, 995, 996, 997, 998, 999]
Content source: uglyboxer/finnegan
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