ZHANG Yixin 15210130100

Homework1


In [2]:
import random, datetime
import numpy as np
import pylab as plt
import statsmodels.api as sm
from scipy.stats import norm
from scipy.stats.stats import pearsonr

In [3]:
str(3)


Out[3]:
'3'

In [4]:
int('5')


Out[4]:
5

In [5]:
float('7.1')


Out[5]:
7.1

In [6]:
range(10)


Out[6]:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

In [7]:
range(1,10)


Out[7]:
[1, 2, 3, 4, 5, 6, 7, 8, 9]

In [8]:
dir


Out[8]:
<function dir>

In [9]:
dir(str)[-5:]


Out[9]:
['swapcase', 'title', 'translate', 'upper', 'zfill']

In [10]:
x='Hello WorlD'
dir(x)[-10:]


Out[10]:
['rstrip',
 'split',
 'splitlines',
 'startswith',
 'strip',
 'swapcase',
 'title',
 'translate',
 'upper',
 'zfill']

In [11]:
x.lower()


Out[11]:
'hello world'

In [12]:
x.upper()


Out[12]:
'HELLO WORLD'

In [13]:
x.rstrip()


Out[13]:
'Hello WorlD'

In [14]:
x.strip()


Out[14]:
'Hello WorlD'

In [16]:
x='hello world'
type(x)


Out[16]:
str

In [18]:
l=[1,2,3,3]
t=(1,2,3,3)
s=set([1,2,3,3])
d={'a':1,'b':2,'c':3}
a=np.array(l)
print l,t,s,d,a


[1, 2, 3, 3] (1, 2, 3, 3) set([1, 2, 3]) {'a': 1, 'c': 3, 'b': 2} [1 2 3 3]

In [19]:
l=[1,2,3,3]
l.append(4)
l


Out[19]:
[1, 2, 3, 3, 4]

In [20]:
d={'a':1,'b':2,'c':3}
d.keys()


Out[20]:
['a', 'c', 'b']

In [21]:
d={'a':1,'b':2,'c':3}
d.values()


Out[21]:
[1, 3, 2]

In [22]:
d={'a':1,'b':2,'c':3}
d.items()


Out[22]:
[('a', 1), ('c', 3), ('b', 2)]

In [23]:
def devidePlus(m,n):
    return float(m)/n+1

In [24]:
range(10)


Out[24]:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

In [25]:
range(1,10)


Out[25]:
[1, 2, 3, 4, 5, 6, 7, 8, 9]

In [26]:
for i in range(10):
    print i,i*10, i**2


0 0 0
1 10 1
2 20 4
3 30 9
4 40 16
5 50 25
6 60 36
7 70 49
8 80 64
9 90 81

In [27]:
for i in range(10):
    print i*10


0
10
20
30
40
50
60
70
80
90

In [28]:
r = [devidePlus(i,2) for i in range(10)]
r


Out[28]:
[1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5]

In [29]:
map(devidePlus, [4,2],[2,1])


Out[29]:
[3.0, 3.0]

In [32]:
j=3
if j%2==1:
    print r'余数是1'
elif j%2==2:
    print r'余数是2'
else:
    print r' 余数既不是1也不是2'


余数是1

In [33]:
x=5
if x<5:
    y=-1
    z=5
elif x>5:
    y=1
    z=11
else:
    y=0
    z=10
print(x,y,z)


(5, 0, 10)

In [34]:
j=0
while j<10:
    print j
    j+=1


0
1
2
3
4
5
6
7
8
9

In [35]:
j=0
while j<10:
    if j%2 !=0:
        print j**2
    j+=1


1
9
25
49
81

In [37]:
j=0
while j<50:
    if j==30:
        break
    if j%2 !=0:
        print j**2
    j+=1


1
9
25
49
81
121
169
225
289
361
441
529
625
729
841

In [38]:
for i in [2,0,5]:
    try:
        print devidePlus(4,i)
    except Exception, e:
        print e
        pass


3.0
float division by zero
1.8

In [39]:
data =[[i,i**2,i**3] for i in range(10)]
data


Out[39]:
[[0, 0, 0],
 [1, 1, 1],
 [2, 4, 8],
 [3, 9, 27],
 [4, 16, 64],
 [5, 25, 125],
 [6, 36, 216],
 [7, 49, 343],
 [8, 64, 512],
 [9, 81, 729]]

In [40]:
for i in data:
    print '\t'.join(map(str,i))


0	0	0
1	1	1
2	4	8
3	9	27
4	16	64
5	25	125
6	36	216
7	49	343
8	64	512
9	81	729

In [44]:
type(data)


Out[44]:
list

In [45]:
len(data)


Out[45]:
10

In [47]:
data[0]


Out[47]:
[0, 0, 0]

In [50]:
data=[[i,i**2,i**3] for i in range(10000)]
f= open("/Users/zhangyixin/Documents/data_write_to_file.txt","wb")
for i in data:
    f.write('\t'.join(map(str,i))+"\n")
f.close()

In [51]:
with open('/Users/zhangyixin/Documents/data_write_to_file.txt','r') as f:
    data=f.readlines()
data[:5]


Out[51]:
['0\t0\t0\n', '1\t1\t1\n', '2\t4\t8\n', '3\t9\t27\n', '4\t16\t64\n']

In [53]:
with open('/Users/zhangyixin/Documents/data_write_to_file.txt','r') as f:
    data=f.readlines(1000)
len(data)


Out[53]:
459

In [54]:
with open('/Users/zhangyixin/Documents/data_write_to_file.txt','r') as f:
    print f.readline()


0	0	0


In [55]:
with open('/Users/zhangyixin/Documents/data_write_to_file.txt','r') as f:
    for k,i in enumerate(f):
        if k%2000==0:
            print i


0	0	0

2000	4000000	8000000000

4000	16000000	64000000000

6000	36000000	216000000000

8000	64000000	512000000000


In [58]:
data=[]
with open("/Users/zhangyixin/Documents/data_write_to_file.txt",'r') as f:
    for line in f:
        line=line.replace('\n','').split('\t')
        line=[int(i) for i in line]
        data.append(line)
data


Out[58]:
[[0, 0, 0],
 [1, 1, 1],
 [2, 4, 8],
 [3, 9, 27],
 [4, 16, 64],
 [5, 25, 125],
 [6, 36, 216],
 [7, 49, 343],
 [8, 64, 512],
 [9, 81, 729],
 [10, 100, 1000],
 [11, 121, 1331],
 [12, 144, 1728],
 [13, 169, 2197],
 [14, 196, 2744],
 [15, 225, 3375],
 [16, 256, 4096],
 [17, 289, 4913],
 [18, 324, 5832],
 [19, 361, 6859],
 [20, 400, 8000],
 [21, 441, 9261],
 [22, 484, 10648],
 [23, 529, 12167],
 [24, 576, 13824],
 [25, 625, 15625],
 [26, 676, 17576],
 [27, 729, 19683],
 [28, 784, 21952],
 [29, 841, 24389],
 [30, 900, 27000],
 [31, 961, 29791],
 [32, 1024, 32768],
 [33, 1089, 35937],
 [34, 1156, 39304],
 [35, 1225, 42875],
 [36, 1296, 46656],
 [37, 1369, 50653],
 [38, 1444, 54872],
 [39, 1521, 59319],
 [40, 1600, 64000],
 [41, 1681, 68921],
 [42, 1764, 74088],
 [43, 1849, 79507],
 [44, 1936, 85184],
 [45, 2025, 91125],
 [46, 2116, 97336],
 [47, 2209, 103823],
 [48, 2304, 110592],
 [49, 2401, 117649],
 [50, 2500, 125000],
 [51, 2601, 132651],
 [52, 2704, 140608],
 [53, 2809, 148877],
 [54, 2916, 157464],
 [55, 3025, 166375],
 [56, 3136, 175616],
 [57, 3249, 185193],
 [58, 3364, 195112],
 [59, 3481, 205379],
 [60, 3600, 216000],
 [61, 3721, 226981],
 [62, 3844, 238328],
 [63, 3969, 250047],
 [64, 4096, 262144],
 [65, 4225, 274625],
 [66, 4356, 287496],
 [67, 4489, 300763],
 [68, 4624, 314432],
 [69, 4761, 328509],
 [70, 4900, 343000],
 [71, 5041, 357911],
 [72, 5184, 373248],
 [73, 5329, 389017],
 [74, 5476, 405224],
 [75, 5625, 421875],
 [76, 5776, 438976],
 [77, 5929, 456533],
 [78, 6084, 474552],
 [79, 6241, 493039],
 [80, 6400, 512000],
 [81, 6561, 531441],
 [82, 6724, 551368],
 [83, 6889, 571787],
 [84, 7056, 592704],
 [85, 7225, 614125],
 [86, 7396, 636056],
 [87, 7569, 658503],
 [88, 7744, 681472],
 [89, 7921, 704969],
 [90, 8100, 729000],
 [91, 8281, 753571],
 [92, 8464, 778688],
 [93, 8649, 804357],
 [94, 8836, 830584],
 [95, 9025, 857375],
 [96, 9216, 884736],
 [97, 9409, 912673],
 [98, 9604, 941192],
 [99, 9801, 970299],
 [100, 10000, 1000000],
 [101, 10201, 1030301],
 [102, 10404, 1061208],
 [103, 10609, 1092727],
 [104, 10816, 1124864],
 [105, 11025, 1157625],
 [106, 11236, 1191016],
 [107, 11449, 1225043],
 [108, 11664, 1259712],
 [109, 11881, 1295029],
 [110, 12100, 1331000],
 [111, 12321, 1367631],
 [112, 12544, 1404928],
 [113, 12769, 1442897],
 [114, 12996, 1481544],
 [115, 13225, 1520875],
 [116, 13456, 1560896],
 [117, 13689, 1601613],
 [118, 13924, 1643032],
 [119, 14161, 1685159],
 [120, 14400, 1728000],
 [121, 14641, 1771561],
 [122, 14884, 1815848],
 [123, 15129, 1860867],
 [124, 15376, 1906624],
 [125, 15625, 1953125],
 [126, 15876, 2000376],
 [127, 16129, 2048383],
 [128, 16384, 2097152],
 [129, 16641, 2146689],
 [130, 16900, 2197000],
 [131, 17161, 2248091],
 [132, 17424, 2299968],
 [133, 17689, 2352637],
 [134, 17956, 2406104],
 [135, 18225, 2460375],
 [136, 18496, 2515456],
 [137, 18769, 2571353],
 [138, 19044, 2628072],
 [139, 19321, 2685619],
 [140, 19600, 2744000],
 [141, 19881, 2803221],
 [142, 20164, 2863288],
 [143, 20449, 2924207],
 [144, 20736, 2985984],
 [145, 21025, 3048625],
 [146, 21316, 3112136],
 [147, 21609, 3176523],
 [148, 21904, 3241792],
 [149, 22201, 3307949],
 [150, 22500, 3375000],
 [151, 22801, 3442951],
 [152, 23104, 3511808],
 [153, 23409, 3581577],
 [154, 23716, 3652264],
 [155, 24025, 3723875],
 [156, 24336, 3796416],
 [157, 24649, 3869893],
 [158, 24964, 3944312],
 [159, 25281, 4019679],
 [160, 25600, 4096000],
 [161, 25921, 4173281],
 [162, 26244, 4251528],
 [163, 26569, 4330747],
 [164, 26896, 4410944],
 [165, 27225, 4492125],
 [166, 27556, 4574296],
 [167, 27889, 4657463],
 [168, 28224, 4741632],
 [169, 28561, 4826809],
 [170, 28900, 4913000],
 [171, 29241, 5000211],
 [172, 29584, 5088448],
 [173, 29929, 5177717],
 [174, 30276, 5268024],
 [175, 30625, 5359375],
 [176, 30976, 5451776],
 [177, 31329, 5545233],
 [178, 31684, 5639752],
 [179, 32041, 5735339],
 [180, 32400, 5832000],
 [181, 32761, 5929741],
 [182, 33124, 6028568],
 [183, 33489, 6128487],
 [184, 33856, 6229504],
 [185, 34225, 6331625],
 [186, 34596, 6434856],
 [187, 34969, 6539203],
 [188, 35344, 6644672],
 [189, 35721, 6751269],
 [190, 36100, 6859000],
 [191, 36481, 6967871],
 [192, 36864, 7077888],
 [193, 37249, 7189057],
 [194, 37636, 7301384],
 [195, 38025, 7414875],
 [196, 38416, 7529536],
 [197, 38809, 7645373],
 [198, 39204, 7762392],
 [199, 39601, 7880599],
 [200, 40000, 8000000],
 [201, 40401, 8120601],
 [202, 40804, 8242408],
 [203, 41209, 8365427],
 [204, 41616, 8489664],
 [205, 42025, 8615125],
 [206, 42436, 8741816],
 [207, 42849, 8869743],
 [208, 43264, 8998912],
 [209, 43681, 9129329],
 [210, 44100, 9261000],
 [211, 44521, 9393931],
 [212, 44944, 9528128],
 [213, 45369, 9663597],
 [214, 45796, 9800344],
 [215, 46225, 9938375],
 [216, 46656, 10077696],
 [217, 47089, 10218313],
 [218, 47524, 10360232],
 [219, 47961, 10503459],
 [220, 48400, 10648000],
 [221, 48841, 10793861],
 [222, 49284, 10941048],
 [223, 49729, 11089567],
 [224, 50176, 11239424],
 [225, 50625, 11390625],
 [226, 51076, 11543176],
 [227, 51529, 11697083],
 [228, 51984, 11852352],
 [229, 52441, 12008989],
 [230, 52900, 12167000],
 [231, 53361, 12326391],
 [232, 53824, 12487168],
 [233, 54289, 12649337],
 [234, 54756, 12812904],
 [235, 55225, 12977875],
 [236, 55696, 13144256],
 [237, 56169, 13312053],
 [238, 56644, 13481272],
 [239, 57121, 13651919],
 [240, 57600, 13824000],
 [241, 58081, 13997521],
 [242, 58564, 14172488],
 [243, 59049, 14348907],
 [244, 59536, 14526784],
 [245, 60025, 14706125],
 [246, 60516, 14886936],
 [247, 61009, 15069223],
 [248, 61504, 15252992],
 [249, 62001, 15438249],
 [250, 62500, 15625000],
 [251, 63001, 15813251],
 [252, 63504, 16003008],
 [253, 64009, 16194277],
 [254, 64516, 16387064],
 [255, 65025, 16581375],
 [256, 65536, 16777216],
 [257, 66049, 16974593],
 [258, 66564, 17173512],
 [259, 67081, 17373979],
 [260, 67600, 17576000],
 [261, 68121, 17779581],
 [262, 68644, 17984728],
 [263, 69169, 18191447],
 [264, 69696, 18399744],
 [265, 70225, 18609625],
 [266, 70756, 18821096],
 [267, 71289, 19034163],
 [268, 71824, 19248832],
 [269, 72361, 19465109],
 [270, 72900, 19683000],
 [271, 73441, 19902511],
 [272, 73984, 20123648],
 [273, 74529, 20346417],
 [274, 75076, 20570824],
 [275, 75625, 20796875],
 [276, 76176, 21024576],
 [277, 76729, 21253933],
 [278, 77284, 21484952],
 [279, 77841, 21717639],
 [280, 78400, 21952000],
 [281, 78961, 22188041],
 [282, 79524, 22425768],
 [283, 80089, 22665187],
 [284, 80656, 22906304],
 [285, 81225, 23149125],
 [286, 81796, 23393656],
 [287, 82369, 23639903],
 [288, 82944, 23887872],
 [289, 83521, 24137569],
 [290, 84100, 24389000],
 [291, 84681, 24642171],
 [292, 85264, 24897088],
 [293, 85849, 25153757],
 [294, 86436, 25412184],
 [295, 87025, 25672375],
 [296, 87616, 25934336],
 [297, 88209, 26198073],
 [298, 88804, 26463592],
 [299, 89401, 26730899],
 [300, 90000, 27000000],
 [301, 90601, 27270901],
 [302, 91204, 27543608],
 [303, 91809, 27818127],
 [304, 92416, 28094464],
 [305, 93025, 28372625],
 [306, 93636, 28652616],
 [307, 94249, 28934443],
 [308, 94864, 29218112],
 [309, 95481, 29503629],
 [310, 96100, 29791000],
 [311, 96721, 30080231],
 [312, 97344, 30371328],
 [313, 97969, 30664297],
 [314, 98596, 30959144],
 [315, 99225, 31255875],
 [316, 99856, 31554496],
 [317, 100489, 31855013],
 [318, 101124, 32157432],
 [319, 101761, 32461759],
 [320, 102400, 32768000],
 [321, 103041, 33076161],
 [322, 103684, 33386248],
 [323, 104329, 33698267],
 [324, 104976, 34012224],
 [325, 105625, 34328125],
 [326, 106276, 34645976],
 [327, 106929, 34965783],
 [328, 107584, 35287552],
 [329, 108241, 35611289],
 [330, 108900, 35937000],
 [331, 109561, 36264691],
 [332, 110224, 36594368],
 [333, 110889, 36926037],
 [334, 111556, 37259704],
 [335, 112225, 37595375],
 [336, 112896, 37933056],
 [337, 113569, 38272753],
 [338, 114244, 38614472],
 [339, 114921, 38958219],
 [340, 115600, 39304000],
 [341, 116281, 39651821],
 [342, 116964, 40001688],
 [343, 117649, 40353607],
 [344, 118336, 40707584],
 [345, 119025, 41063625],
 [346, 119716, 41421736],
 [347, 120409, 41781923],
 [348, 121104, 42144192],
 [349, 121801, 42508549],
 [350, 122500, 42875000],
 [351, 123201, 43243551],
 [352, 123904, 43614208],
 [353, 124609, 43986977],
 [354, 125316, 44361864],
 [355, 126025, 44738875],
 [356, 126736, 45118016],
 [357, 127449, 45499293],
 [358, 128164, 45882712],
 [359, 128881, 46268279],
 [360, 129600, 46656000],
 [361, 130321, 47045881],
 [362, 131044, 47437928],
 [363, 131769, 47832147],
 [364, 132496, 48228544],
 [365, 133225, 48627125],
 [366, 133956, 49027896],
 [367, 134689, 49430863],
 [368, 135424, 49836032],
 [369, 136161, 50243409],
 [370, 136900, 50653000],
 [371, 137641, 51064811],
 [372, 138384, 51478848],
 [373, 139129, 51895117],
 [374, 139876, 52313624],
 [375, 140625, 52734375],
 [376, 141376, 53157376],
 [377, 142129, 53582633],
 [378, 142884, 54010152],
 [379, 143641, 54439939],
 [380, 144400, 54872000],
 [381, 145161, 55306341],
 [382, 145924, 55742968],
 [383, 146689, 56181887],
 [384, 147456, 56623104],
 [385, 148225, 57066625],
 [386, 148996, 57512456],
 [387, 149769, 57960603],
 [388, 150544, 58411072],
 [389, 151321, 58863869],
 [390, 152100, 59319000],
 [391, 152881, 59776471],
 [392, 153664, 60236288],
 [393, 154449, 60698457],
 [394, 155236, 61162984],
 [395, 156025, 61629875],
 [396, 156816, 62099136],
 [397, 157609, 62570773],
 [398, 158404, 63044792],
 [399, 159201, 63521199],
 [400, 160000, 64000000],
 [401, 160801, 64481201],
 [402, 161604, 64964808],
 [403, 162409, 65450827],
 [404, 163216, 65939264],
 [405, 164025, 66430125],
 [406, 164836, 66923416],
 [407, 165649, 67419143],
 [408, 166464, 67917312],
 [409, 167281, 68417929],
 [410, 168100, 68921000],
 [411, 168921, 69426531],
 [412, 169744, 69934528],
 [413, 170569, 70444997],
 [414, 171396, 70957944],
 [415, 172225, 71473375],
 [416, 173056, 71991296],
 [417, 173889, 72511713],
 [418, 174724, 73034632],
 [419, 175561, 73560059],
 [420, 176400, 74088000],
 [421, 177241, 74618461],
 [422, 178084, 75151448],
 [423, 178929, 75686967],
 [424, 179776, 76225024],
 [425, 180625, 76765625],
 [426, 181476, 77308776],
 [427, 182329, 77854483],
 [428, 183184, 78402752],
 [429, 184041, 78953589],
 [430, 184900, 79507000],
 [431, 185761, 80062991],
 [432, 186624, 80621568],
 [433, 187489, 81182737],
 [434, 188356, 81746504],
 [435, 189225, 82312875],
 [436, 190096, 82881856],
 [437, 190969, 83453453],
 [438, 191844, 84027672],
 [439, 192721, 84604519],
 [440, 193600, 85184000],
 [441, 194481, 85766121],
 [442, 195364, 86350888],
 [443, 196249, 86938307],
 [444, 197136, 87528384],
 [445, 198025, 88121125],
 [446, 198916, 88716536],
 [447, 199809, 89314623],
 [448, 200704, 89915392],
 [449, 201601, 90518849],
 [450, 202500, 91125000],
 [451, 203401, 91733851],
 [452, 204304, 92345408],
 [453, 205209, 92959677],
 [454, 206116, 93576664],
 [455, 207025, 94196375],
 [456, 207936, 94818816],
 [457, 208849, 95443993],
 [458, 209764, 96071912],
 [459, 210681, 96702579],
 [460, 211600, 97336000],
 [461, 212521, 97972181],
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In [ ]: