Pythonでファイルからリストを読み取るにはどうすればよいですか？

Question

私はソートアルゴリズムを効率的に見るためにリストをソートすることで比較する必要があります（10,100,10000000要素のリストなど） リストをコードに直接実装しましたが、プログラム遅くなり、多くのリソースを食べています。 例として、.txtファイルからリストを読み込むためにPython 2.7（Mac）で使用するコード行は何ですか？

from timeit import default_timer as timer 
import resource 
start = timer() 
def quickSort(alist): 
    quickSortHelper(alist,0,len(alist)-1) 

def quickSortHelper(alist,first,last): 
    if first<last: 

     splitpoint = partition(alist,first,last) 

     quickSortHelper(alist,first,splitpoint-1) 
     quickSortHelper(alist,splitpoint+1,last) 


def partition(alist,first,last): 
    pivotvalue = alist[first] 

    leftmark = first+1 
    rightmark = last 

    done = False 
    while not done: 

     while leftmark <= rightmark and alist[leftmark] <= pivotvalue: 
      leftmark = leftmark + 1 

     while alist[rightmark] >= pivotvalue and rightmark >= leftmark: 
      rightmark = rightmark -1 

     if rightmark < leftmark: 
      done = True 
     else: 
      temp = alist[leftmark] 
      alist[leftmark] = alist[rightmark] 
      alist[rightmark] = temp 

    temp = alist[first] 
    alist[first] = alist[rightmark] 
    alist[rightmark] = temp 


    return rightmark 

alist = 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3414,20,4525,1426,4420,4698,975,752,499,3189,4308,2766,299,3724,3766,3195,4217,916,4550,334,4657,1149,2633,2008,2290,188,3168,3462,583,67,3185,1087,3917,3888,3351,646,4840,2386,2428,1175,2301,2594,872,3504,4322,3494,2021,764,207,1379,4803,418,3205,3119,3068,3190,2039,4193,832,3955,354,1343,4702,73,2356,4534,555,3254,1021,4439,3291,4410,3534,2703,2316,2614,1841,1429,2887,972,3513,3329,87,1959,4923,1928,1860,3251,3106,703,3321,1616,1284,789,1976,1049,3310,4927,2943,4065,3125,2775,1473,4351,3395,3881,3893,1845,625,4736,492,4487,1627,2716,327,2001,3543,3539,2438,3530,2792,1798,4556,4483,1160,4512,2069,3994,3783,4793,4852,2983,3157,1422,4353,3375,111,3774,2676,2707,2537,55,507,808,351,2615,3914,745,4000,4038,2552,1060,2650,2503,3734,1126,4265,3912,817,684,2954,3166,732,1474,888,1528,4375,3819,3707,657,1186,4621,893,2527,4033,3929,1022,3585,3326,82,1931,4848,4329,678,4239,726,4535,3477,226,346,286,4960,2347,524,4834,967,360,2149,1970,2752,1206,3355,1859,1237,1061,4273,1847,2233,4576,2444,1052,3083,1969,1249,4605,50,1775,1935,4563,3176,1489,5000,3110,256,1251,3466,4691,3340,2334,4215,1539,776,403,2883,242,4131,3448,3531,3897,2072,3020,4073,1201,2934,1182,2501,3562,3246,1069,4978,4288,237,1781,2968,3846,2369,127,2180,4789,2239,2168,2789,1752,4619,6,2572,2753,2696,1346,3436,2131,1544,3344,4553,2532,948,1559,1454,2309,4072,578,4089,1027,2457,4394,1072,3248,4299,3666,2776,2058,4779,2046,2845,4119,3381,3916,2197,4987,517,4567,2630,3610,1532,1666,3873,2406,2599,2892,1380,4429,3000,2186,809,1420,3680,919,1754,907,2731,2272,4818,4174,2644,1784,1115,440,3309,3770,3136,4279,3198,3832,1755,4821,3030,1520,3450,233,2511,506,2248,232,103,2557,1112,4358,2756,338,4514,1707,2283,940,2354,2266,4925,1138,472,936,3744,4723,824,4991,3422,3990,2830,3817,1688,3493,2331,1200,3617,622,1305,3702,1763,862,1934,3396,4345,3549,863,3213,3297,1792,497,1907,3147,2093,3331,2888,3795,1819,3569,1360,310,434,1790,934,2288,3328,1927,2264,1207,2844,2352,4980,1051,4303,369,1693,313,4049,658,1624,3063,337,198,3622,2207,4649,4617,4547,359,4954,1936,4496,1590,3749,2601,4395,9,4562,4841,2510,4145,1329,2159,2497,1007,3480,3129,2822,4748,1486,4500,4624,4761,1095,445,3261,4593,2177,1835,1536,4059,475,245,1607,1221,4527,4699,505,2189,4202,3855,3111,100,3825,1363,2898,2442,2980,4311,3098,3002,866,3860,3500,3353,2963,3054,2095,3584,1774,786,1718,4402,97,3718,1993,3047,3872,935,2770,3295,2322,1867,3576,1795,2930,1816,2991,2067,2091,2509,4763,4253,585,3753,2672,700,3711,3552,2871,241,3241,1638,3272,3052,573,1783,4264,144,3647,45,994,218,2546,3829,1843,29,2663,842,2355,901,3490,673,1127,22,1669,920,999,4381,3735,1747,1689,2619,3798,4918,3170,3453,2602,3827,1833,2329,161,3886,3124,479,4799,3256,1076,4889,3605,4082,4890,248,3961,3388,2376,2273,47,620,960,2108,3221,1030,1522,1278,2846,3717,1256,2229,4682,2458,3391,228,1525,1776,2578,4670,2061,1211,3196,2842,1259,4705,477,3572,1468,2029,4165,4398,312,1602,4168,3570,4782,3996,62,3935,4538,754,1444,4625,3138,1885,750,3974,3643,4186,4770,2227,3918,2118,2704,3318,4342,2577,2745,80,1585,1937,36,2949,3714,1210,1490,4276,293,584,2748,4637,452,1889,2003,4090,2498,4503,3056,4665,4555,733,32,1412,1353,891,2466,4744,4478,2523,925,1176,3503,3426,3368,2488,3376,196,855,3366,4036,2895,3801,3447,2476,3109,1553,3371,4337,2261,495,2452,3399,3278,498,165,2136,2181,2317,1391,3383,604,1756,173,3574,2035,4212,3428,1876,4917,2346,4192,419,1213,2401,2728,2620,31,3033,322,4865,4965,2339,3678,4325,2961,2082,348,3901,2436,2373,2262,1361,243,2038,1008,2023,1322,1482,1750,4877,128,3609,3540,4564,904,932,4128,3350,2230,3977,3094,3927,396,3940,2593,1869,1009,2094,774,420,2,2121,731,4784,3365,1217,1121,2484,3973,1470,2804,4614,4162,3636,3802,168,3879,3655,4943,4121,1529,4332,2668,1593,1017,1672,2128,753,1961,3907,488,2517,2489,2834,383,1047,2864,3458,1371,2184,1954,2280,2306,2281,4495,1010,4142,2569,1274,2411,3377,3525,3357,474,1901,3273,4318,1978,140,4813,106,1229,2832,273,518,898,4477,4039,1122,4116,4708,4765,1563,680,4658,23,2998,2223,3296,1887,2270,4891,1791,1309,454,2571,3794,1286,4209,3575,1633,3915,2727,4188,1914,3390,984,306,2636,2739,4167,4861,3686,1611,2439,3386,3992,4040,4392,2366,3752,4435,1001,4386,1086,1225,3923,1437,1643,3670,947,714,2474,280,4573,3335,2799,1614,1039,3314,3429,1973,2535,352,645,4416,3787,3481,4651,3203,3244,2341,1083,4628,1275,2101,4198,1682,160,1504,425,324,375,3150,2030,4596,2433,642,110,4623,435,3484,2801,2958,3446,1465,3743,1594,1587,3535,1652,1046,1103,909,2768,467,3087,4511,3651,3740,2612,3800,98,3017,1870,946,4720,2250,4509,4507,102,2664,3518,2253,3536,4735,3281,2824,632,1029,3175,4907,861,3127,654,4901,2802,4404,2493,4602,4480,4600,2637,3139,2404,456,1910,2461,4545,1328,529,1313,2252,4884,2054,378,2993,24,3614,3619,3470,3258,4024,2172,1263,4286,3327,825,2626,3324,1815,1169,3604,4992,4011,1196,1828,83,2797,1631,3459,656,438,1487,1723,2661,4008,3460,2213,4025,4181,3814,4835,3750,1547,1674,2004,2221,1844,1136,150,812,1242,4117,4380,3028,958,27,2435,4007,1738,3163,3948,2988,1720,4069,1965,3320,2543,3463,2152,1994,834,3183,4403,3952,1921,164,1700,2113,4423,1894,89,336,2625,2292,3867,1150,1933,1580,3704,1704,358,4855,4281,2631,2967,3618,4520,1447,1208,1509,1273,1461,2500,2027,1926,2876,1356,3018,2037,4773,3179,2956,4716,281,4872,217,1094,2558,2687,1878,2173,1846,1306,4863,4775,4751,2772,3857,1425,3249,2310,2529,4463,2049,3467,592,2939,2048,4173,2754,2555,2191,2734,3346,2686,1571,397,326,2106,4058,552,1642,330,641,4540,212,1717,2563,2923,1040,2790,586,2536,1873,2699,4391,2632,4768,3172,3131,532,992,2066,4418,3108,1866,2777,3587,1075,1898,1673,2744,1013,3895,1924,423,1034,1428,316,1599,1195,2434,1623,4816,2298,3378,1687,3384,71,238,4383,1168,3736,1325,343,2928,2831,3865,2695,4248,1350,951,1384,4929,1890,1569,540,3845,561,1448,4792,1832,4908,171,3478,3601,2388,3944,740,3945,2579,4568,37,457,1944,1344,4549,3808,769,2985,1355,1258,3634,1676,3045,3333,4231,4377,1842,2713,3015,2879,3561,4124,4554,3726,2953,3956,922,3060,4219,3599,4951,4484,3885,1323,3043,865,2974,371,4912,2487,3899,4970,2323,3311,1942,4270,1499,2947,2174,4694,3781,4995,2110,756,4561,1308,4408,877,2470,3853,2125,4450,197,3173,3167,156,4094,3626,4536,2324,1250,1414,4630,3234,4591,1427,718,2084,4097,2611,386,4021,3930,4853,2286,236,2681,266,986,4070,531,4467,4953,4328,4135,3420,4344,849,2015,58,3652,4704,4088,4758,4339,881,2519,1180,176,723,4519,3403,2016,4772,938,1578,2353,3489,3159,1416,4433,4458,3006,179,2580,1307,1419,2447,3548,4810,757,428,4291,1393,2117,2606,4067,4225,4037,2287,4042,2885,4293,4707,1719,373,2414,3379,781,587,1839,277,4595,4306,1091,900,135,2737,2935,4805,4079,2862,2490,2413,2669,4924,1005,4257,2989,1737,903,4100,3433,3212,2415,1179,4085,748,86,1853,2600,1877,648,1938,749,2924,1458,2760,2134,30,1516,3564,2079,331,2549,4746,370,4023,2421,2479,2574,3444,4777,2059,1506,4464,2762,2836,614,2679,3424,4150,3070,2916,3239,4064,2513,3114,4338,3007,2471,1194,1496,444,1527,1837,2959,698,1335,4220,3673,1301,2984,988,987,2747,1285,4942,4233,1803,4936,669,1441,581,2321,510,3922,18,2085,4452,3225,1955,4313,4247,4681,1810,2065,2099,1809,717,1811,2622,1565,2024,3852,2913,3911,4223,4786,1244,2446,1799,3693,1036,3672,1891,3178,484,1621,1198,1957,3586,494,2188,3492,4,387,2165,2416,2107,1236,993,1106,2841,1913,2163,4430,847,4161,4261,1271,3508,290,4584,3921,1678,4686,663,2392,3243,3497,4867,660,3630,528,3316,1659,1042,2907,2075,209,4226,3642,2402,4319,2717,8,149,3358,4103,2225,4096,590,3943,4187,3343,1612,683,3440,4823,1240,4063,3840,1800,4667,1002,4071,2624,3837,1834,4066,4580,2036,837,3751,3443,2018,3423,921,3580,2666,3522,1575,4990,1825,4849,4148,890,4045,3939,793,2902,3986,170,159,3988,4521,1918,3352,1320,3545,628,4158,1421,4928,577,3582,582,2014,554,913,2950,1663,4232,4426,3389,3919,3590,3828,3148,3230,42,1033,1589,1515,1248,3932,1077,48,4134,3511,928,2020,2858,1501,4505,1382,1782,65,2060,1989,2821,997,1714,4854,1222,4155,4178,2275,694,3067,2088,2648,220,3731,257,251,4680,802,790,1084,1596,691,4055,695,2565,4542,1403,2586,905,2214,4348,4493,15,253,4958,3628,1625,138,1435,1147,670,799,4893,4537,3987,2941,1777,2551,3476,1173,2153,2512,4892,1647,309,858,4737,4641,1146,1148,4730,1398,4546,1203,4804,261,2918,2701,4592,394,2417,1582,2647,1771,2839,4711,4673,4771,911,3715,187,4533,608,1117,1165,3788,4814,2639,779,4461,4740,1636,1639,2370,615,308,706,1031,1858,954,2377,2553,3345,114,4501,4244,3323,551,3782,1377,2816,2649,1111,1073,1224,4160,1741,647,2251,4866,3844,4727,4170,2398,2335,1018,2111,758,1357,4759,2494,3870,4856,3245,1952,4539,3900,19,1758,611,501,2809,4626,1038,3076,973,1376,1856,2403,2915,4368,3869,1762,2053,3137,4886,653,3435,4781,3126,924,4184,4305,3370,4725,4757,668,2348,302,1543,178,2315,2627,4831,2683,478,4361,1497,2410,4815,3061,2891,4962,1868,639,3679,4238,92,1746,300,2525,4506,1319,1681,1929,1171,4559,2007,2483,1608,2741,3838,491,2996,705,2828,4355,1055,4661,3621,689,3998,2765,2318,3096,1992,1861,4453,626,869,4246,4749,2677,4747,571,3716,318,4061,1266,3667,51] 
quickSort(alist) 
print(alist), resource.getrusage(resource.RUSAGE_SELF).ru_maxrss/1000 
end = timer() 
print(end - start) 

おかげ

Answer 1

これは、あなたが望んでいるもののために非常に長い質問です。私はあなたがからに文字列を読みたい場合は、もちろん

eval (string) 

を使用したい、この質問をリストに変換するために、基本的に

How do I execute a string containing Python code in Python?

それを最大限に答えると思いますあなたが別の行に各番号を持つファイルがある場合は、単にFi回線を開くことができるように、テキストファイル、これは

with open(fname) as f: 
    content = f.read() 

Answer 2

ファイルオブジェクトは、Pythonで反復可能であることをお答えしますル、文字列のリストとして扱い、整数に各リスト要素をマップ：

with open(filename) as f: 
    alist = map(int, f) 

Answer 3

あなたは括弧なしでファイルにリストを保存し、その後

import numpy as np 
my_array = np.genfromtext('filename.txt', delimiter=',') 
# this is numpy array, to convert it to list do: 
my_list = my_array.tolist() 

またはnumpyのなしをnumpyの使用することができます：

f = file.open('filename.txt', 'r') 
long_string = f.readline() 
my_list = long_string.split(',') 

Answer 4

リストをpickle形式で保存し、バッチ単位で取得することができます。 こちらはlinkです。ここで

は、あなたのための一例である

import pickle  
listname = [1,2,3,4]  
with open('filename.pkl', 'wb') as f: 
    pickle.dump(listname, f) 

、あなたはそれをリードバックする）（pickle.loadを使用することができます。