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Python笔记 ＋
打印很大的numpy.array
2020年7月6日 / 82次阅读 / Last Modified 2021年5月29日
NumPy
一般情况下numpy.array里面的数据非常多，要全部打印出来也有点不现实，因为numpy对于打印，是有一套自己的规则的：
- the last axis is printed from left to right,
- the second-to-last is printed from top to bottom,
- the rest are also printed from top to bottom, with each slice separated from the next by an empty line.
最高维度含有真正的数据，从左到右打印；倒数第2个维度，就从上到下打印了；其它的维度也都是从上到下打印，中间间隔一些空白行将部分数据省略掉。
我们来打一个10000个数据的araay看一下：
>>> a = np.arange(10000).reshape(10,10,10,10)
>>> a
array([[[[ 0, 1, 2, ..., 7, 8, 9],
[ 10, 11, 12, ..., 17, 18, 19],
[ 20, 21, 22, ..., 27, 28, 29],
...,
[ 70, 71, 72, ..., 77, 78, 79],
[ 80, 81, 82, ..., 87, 88, 89],
[ 90, 91, 92, ..., 97, 98, 99]],
[[ 100, 101, 102, ..., 107, 108, 109],
[ 110, 111, 112, ..., 117, 118, 119],
[ 120, 121, 122, ..., 127, 128, 129],
...,
[ 170, 171, 172, ..., 177, 178, 179],
[ 180, 181, 182, ..., 187, 188, 189],
[ 190, 191, 192, ..., 197, 198, 199]],
[[ 200, 201, 202, ..., 207, 208, 209],
[ 210, 211, 212, ..., 217, 218, 219],
[ 220, 221, 222, ..., 227, 228, 229],
...,
[ 270, 271, 272, ..., 277, 278, 279],
[ 280, 281, 282, ..., 287, 288, 289],
[ 290, 291, 292, ..., 297, 298, 299]],
...,
[[ 700, 701, 702, ..., 707, 708, 709],
[ 710, 711, 712, ..., 717, 718, 719],
[ 720, 721, 722, ..., 727, 728, 729],
...,
[ 770, 771, 772, ..., 777, 778, 779],
[ 780, 781, 782, ..., 787, 788, 789],
[ 790, 791, 792, ..., 797, 798, 799]],
[[ 800, 801, 802, ..., 807, 808, 809],
[ 810, 811, 812, ..., 817, 818, 819],
[ 820, 821, 822, ..., 827, 828, 829],
...,
[ 870, 871, 872, ..., 877, 878, 879],
[ 880, 881, 882, ..., 887, 888, 889],
[ 890, 891, 892, ..., 897, 898, 899]],
[[ 900, 901, 902, ..., 907, 908, 909],
[ 910, 911, 912, ..., 917, 918, 919],
[ 920, 921, 922, ..., 927, 928, 929],
...,
[ 970, 971, 972, ..., 977, 978, 979],
[ 980, 981, 982, ..., 987, 988, 989],
[ 990, 991, 992, ..., 997, 998, 999]]],
[[[1000, 1001, 1002, ..., 1007, 1008, 1009],
[1010, 1011, 1012, ..., 1017, 1018, 1019],
[1020, 1021, 1022, ..., 1027, 1028, 1029],
...,
[1070, 1071, 1072, ..., 1077, 1078, 1079],
[1080, 1081, 1082, ..., 1087, 1088, 1089],
[1090, 1091, 1092, ..., 1097, 1098, 1099]],
[[1100, 1101, 1102, ..., 1107, 1108, 1109],
[1110, 1111, 1112, ..., 1117, 1118, 1119],
[1120, 1121, 1122, ..., 1127, 1128, 1129],
...,
[1170, 1171, 1172, ..., 1177, 1178, 1179],
[1180, 1181, 1182, ..., 1187, 1188, 1189],
[1190, 1191, 1192, ..., 1197, 1198, 1199]],
[[1200, 1201, 1202, ..., 1207, 1208, 1209],
[1210, 1211, 1212, ..., 1217, 1218, 1219],
[1220, 1221, 1222, ..., 1227, 1228, 1229],
...,
[1270, 1271, 1272, ..., 1277, 1278, 1279],
[1280, 1281, 1282, ..., 1287, 1288, 1289],
[1290, 1291, 1292, ..., 1297, 1298, 1299]],
...,
[[1700, 1701, 1702, ..., 1707, 1708, 1709],
[1710, 1711, 1712, ..., 1717, 1718, 1719],
[1720, 1721, 1722, ..., 1727, 1728, 1729],
...,
[1770, 1771, 1772, ..., 1777, 1778, 1779],
[1780, 1781, 1782, ..., 1787, 1788, 1789],
[1790, 1791, 1792, ..., 1797, 1798, 1799]],
[[1800, 1801, 1802, ..., 1807, 1808, 1809],
[1810, 1811, 1812, ..., 1817, 1818, 1819],
[1820, 1821, 1822, ..., 1827, 1828, 1829],
...,
[1870, 1871, 1872, ..., 1877, 1878, 1879],
[1880, 1881, 1882, ..., 1887, 1888, 1889],
[1890, 1891, 1892, ..., 1897, 1898, 1899]],
[[1900, 1901, 1902, ..., 1907, 1908, 1909],
[1910, 1911, 1912, ..., 1917, 1918, 1919],
[1920, 1921, 1922, ..., 1927, 1928, 1929],
...,
[1970, 1971, 1972, ..., 1977, 1978, 1979],
[1980, 1981, 1982, ..., 1987, 1988, 1989],
[1990, 1991, 1992, ..., 1997, 1998, 1999]]],
[[[2000, 2001, 2002, ..., 2007, 2008, 2009],
[2010, 2011, 2012, ..., 2017, 2018, 2019],
[2020, 2021, 2022, ..., 2027, 2028, 2029],
...,
[2070, 2071, 2072, ..., 2077, 2078, 2079],
[2080, 2081, 2082, ..., 2087, 2088, 2089],
[2090, 2091, 2092, ..., 2097, 2098, 2099]],
[[2100, 2101, 2102, ..., 2107, 2108, 2109],
[2110, 2111, 2112, ..., 2117, 2118, 2119],
[2120, 2121, 2122, ..., 2127, 2128, 2129],
...,
[2170, 2171, 2172, ..., 2177, 2178, 2179],
[2180, 2181, 2182, ..., 2187, 2188, 2189],
[2190, 2191, 2192, ..., 2197, 2198, 2199]],
[[2200, 2201, 2202, ..., 2207, 2208, 2209],
[2210, 2211, 2212, ..., 2217, 2218, 2219],
[2220, 2221, 2222, ..., 2227, 2228, 2229],
...,
[2270, 2271, 2272, ..., 2277, 2278, 2279],
[2280, 2281, 2282, ..., 2287, 2288, 2289],
[2290, 2291, 2292, ..., 2297, 2298, 2299]],
...,
[[2700, 2701, 2702, ..., 2707, 2708, 2709],
[2710, 2711, 2712, ..., 2717, 2718, 2719],
[2720, 2721, 2722, ..., 2727, 2728, 2729],
...,
[2770, 2771, 2772, ..., 2777, 2778, 2779],
[2780, 2781, 2782, ..., 2787, 2788, 2789],
[2790, 2791, 2792, ..., 2797, 2798, 2799]],
[[2800, 2801, 2802, ..., 2807, 2808, 2809],
[2810, 2811, 2812, ..., 2817, 2818, 2819],
[2820, 2821, 2822, ..., 2827, 2828, 2829],
...,
[2870, 2871, 2872, ..., 2877, 2878, 2879],
[2880, 2881, 2882, ..., 2887, 2888, 2889],
[2890, 2891, 2892, ..., 2897, 2898, 2899]],
[[2900, 2901, 2902, ..., 2907, 2908, 2909],
[2910, 2911, 2912, ..., 2917, 2918, 2919],
[2920, 2921, 2922, ..., 2927, 2928, 2929],
...,
[2970, 2971, 2972, ..., 2977, 2978, 2979],
[2980, 2981, 2982, ..., 2987, 2988, 2989],
[2990, 2991, 2992, ..., 2997, 2998, 2999]]],
...,
[[[7000, 7001, 7002, ..., 7007, 7008, 7009],
[7010, 7011, 7012, ..., 7017, 7018, 7019],
[7020, 7021, 7022, ..., 7027, 7028, 7029],
...,
[7070, 7071, 7072, ..., 7077, 7078, 7079],
[7080, 7081, 7082, ..., 7087, 7088, 7089],
[7090, 7091, 7092, ..., 7097, 7098, 7099]],
[[7100, 7101, 7102, ..., 7107, 7108, 7109],
[7110, 7111, 7112, ..., 7117, 7118, 7119],
[7120, 7121, 7122, ..., 7127, 7128, 7129],
...,
[7170, 7171, 7172, ..., 7177, 7178, 7179],
[7180, 7181, 7182, ..., 7187, 7188, 7189],
[7190, 7191, 7192, ..., 7197, 7198, 7199]],
[[7200, 7201, 7202, ..., 7207, 7208, 7209],
[7210, 7211, 7212, ..., 7217, 7218, 7219],
[7220, 7221, 7222, ..., 7227, 7228, 7229],
...,
[7270, 7271, 7272, ..., 7277, 7278, 7279],
[7280, 7281, 7282, ..., 7287, 7288, 7289],
[7290, 7291, 7292, ..., 7297, 7298, 7299]],
...,
[[7700, 7701, 7702, ..., 7707, 7708, 7709],
[7710, 7711, 7712, ..., 7717, 7718, 7719],
[7720, 7721, 7722, ..., 7727, 7728, 7729],
...,
[7770, 7771, 7772, ..., 7777, 7778, 7779],
[7780, 7781, 7782, ..., 7787, 7788, 7789],
[7790, 7791, 7792, ..., 7797, 7798, 7799]],
[[7800, 7801, 7802, ..., 7807, 7808, 7809],
[7810, 7811, 7812, ..., 7817, 7818, 7819],
[7820, 7821, 7822, ..., 7827, 7828, 7829],
...,
[7870, 7871, 7872, ..., 7877, 7878, 7879],
[7880, 7881, 7882, ..., 7887, 7888, 7889],
[7890, 7891, 7892, ..., 7897, 7898, 7899]],
[[7900, 7901, 7902, ..., 7907, 7908, 7909],
[7910, 7911, 7912, ..., 7917, 7918, 7919],
[7920, 7921, 7922, ..., 7927, 7928, 7929],
...,
[7970, 7971, 7972, ..., 7977, 7978, 7979],
[7980, 7981, 7982, ..., 7987, 7988, 7989],
[7990, 7991, 7992, ..., 7997, 7998, 7999]]],
[[[8000, 8001, 8002, ..., 8007, 8008, 8009],
[8010, 8011, 8012, ..., 8017, 8018, 8019],
[8020, 8021, 8022, ..., 8027, 8028, 8029],
...,
[8070, 8071, 8072, ..., 8077, 8078, 8079],
[8080, 8081, 8082, ..., 8087, 8088, 8089],
[8090, 8091, 8092, ..., 8097, 8098, 8099]],
[[8100, 8101, 8102, ..., 8107, 8108, 8109],
[8110, 8111, 8112, ..., 8117, 8118, 8119],
[8120, 8121, 8122, ..., 8127, 8128, 8129],
...,
[8170, 8171, 8172, ..., 8177, 8178, 8179],
[8180, 8181, 8182, ..., 8187, 8188, 8189],
[8190, 8191, 8192, ..., 8197, 8198, 8199]],
[[8200, 8201, 8202, ..., 8207, 8208, 8209],
[8210, 8211, 8212, ..., 8217, 8218, 8219],
[8220, 8221, 8222, ..., 8227, 8228, 8229],
...,
[8270, 8271, 8272, ..., 8277, 8278, 8279],
[8280, 8281, 8282, ..., 8287, 8288, 8289],
[8290, 8291, 8292, ..., 8297, 8298, 8299]],
...,
[[8700, 8701, 8702, ..., 8707, 8708, 8709],
[8710, 8711, 8712, ..., 8717, 8718, 8719],
[8720, 8721, 8722, ..., 8727, 8728, 8729],
...,
[8770, 8771, 8772, ..., 8777, 8778, 8779],
[8780, 8781, 8782, ..., 8787, 8788, 8789],
[8790, 8791, 8792, ..., 8797, 8798, 8799]],
[[8800, 8801, 8802, ..., 8807, 8808, 8809],
[8810, 8811, 8812, ..., 8817, 8818, 8819],
[8820, 8821, 8822, ..., 8827, 8828, 8829],
...,
[8870, 8871, 8872, ..., 8877, 8878, 8879],
[8880, 8881, 8882, ..., 8887, 8888, 8889],
[8890, 8891, 8892, ..., 8897, 8898, 8899]],
[[8900, 8901, 8902, ..., 8907, 8908, 8909],
[8910, 8911, 8912, ..., 8917, 8918, 8919],
[8920, 8921, 8922, ..., 8927, 8928, 8929],
...,
[8970, 8971, 8972, ..., 8977, 8978, 8979],
[8980, 8981, 8982, ..., 8987, 8988, 8989],
[8990, 8991, 8992, ..., 8997, 8998, 8999]]],
[[[9000, 9001, 9002, ..., 9007, 9008, 9009],
[9010, 9011, 9012, ..., 9017, 9018, 9019],
[9020, 9021, 9022, ..., 9027, 9028, 9029],
...,
[9070, 9071, 9072, ..., 9077, 9078, 9079],
[9080, 9081, 9082, ..., 9087, 9088, 9089],
[9090, 9091, 9092, ..., 9097, 9098, 9099]],
[[9100, 9101, 9102, ..., 9107, 9108, 9109],
[9110, 9111, 9112, ..., 9117, 9118, 9119],
[9120, 9121, 9122, ..., 9127, 9128, 9129],
...,
[9170, 9171, 9172, ..., 9177, 9178, 9179],
[9180, 9181, 9182, ..., 9187, 9188, 9189],
[9190, 9191, 9192, ..., 9197, 9198, 9199]],
[[9200, 9201, 9202, ..., 9207, 9208, 9209],
[9210, 9211, 9212, ..., 9217, 9218, 9219],
[9220, 9221, 9222, ..., 9227, 9228, 9229],
...,
[9270, 9271, 9272, ..., 9277, 9278, 9279],
[9280, 9281, 9282, ..., 9287, 9288, 9289],
[9290, 9291, 9292, ..., 9297, 9298, 9299]],
...,
[[9700, 9701, 9702, ..., 9707, 9708, 9709],
[9710, 9711, 9712, ..., 9717, 9718, 9719],
[9720, 9721, 9722, ..., 9727, 9728, 9729],
...,
[9770, 9771, 9772, ..., 9777, 9778, 9779],
[9780, 9781, 9782, ..., 9787, 9788, 9789],
[9790, 9791, 9792, ..., 9797, 9798, 9799]],
[[9800, 9801, 9802, ..., 9807, 9808, 9809],
[9810, 9811, 9812, ..., 9817, 9818, 9819],
[9820, 9821, 9822, ..., 9827, 9828, 9829],
...,
[9870, 9871, 9872, ..., 9877, 9878, 9879],
[9880, 9881, 9882, ..., 9887, 9888, 9889],
[9890, 9891, 9892, ..., 9897, 9898, 9899]],
[[9900, 9901, 9902, ..., 9907, 9908, 9909],
[9910, 9911, 9912, ..., 9917, 9918, 9919],
[9920, 9921, 9922, ..., 9927, 9928, 9929],
...,
[9970, 9971, 9972, ..., 9977, 9978, 9979],
[9980, 9981, 9982, ..., 9987, 9988, 9989],
[9990, 9991, 9992, ..., 9997, 9998, 9999]]]])
其实，最后一个axis如果数据很多，中间也有省略。你会发现numpy打印出来的都是数据的4个角！
如果想全部打印出来看，有办法吗？有啊，自己写for-loop。另外就是使用 np.set_printoptions:
>>> np.set_printoptions(threshold=sys.maxsize)
我就不打印了，太长了。。。请自己测试一下吧。
更多控制打印细节的参数：
>>> help(np.set_printoptions)
-- EOF --
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