Python课程|上机小任务2.1-随机数练习

●构造一个大小（size）为100（共100 个数）的随机 0、1 数组（array，或称序列），也就是一个只含 0、1 的数组，要求 0 出现的概率为 1/3，1 出现的概率为 2/3，然后打印出该数组，并打印出 0的总个数、1 的总个数。 
[提示：可通过构造一个大小为 100 的在[0,1]之间均匀分布的随机数数组结合判断实现] 

●再构造一个大小为 10000（共 10000 个数）的正态分布数组（均值为 0，方差为 1 的高斯随机数数组，可用randn 实现），并以0.2 为间隔，统计该数组落入-2~2 范围内的各间隔内的点数（即，统计-2~-1.8，-1.8~-1.6，...，-0.2~0，0~0.2，0.2~0.4，... ，1.8~2 范围内各落入多少个数？），并打印出统计结果（注：应打印出20 个统计结果）、以及这20 个统计结果之和。 

import numpy as np

# 随机打印100个数字，1/3概率为0，2/3概率为1
def num_100():

    a = np.random.rand(100)
    b = list(a)

    num_zeros = []
    num_ones = []
    num = []

    for i in b:
        if i < 1/3:
            num_zeros.append(0)
            num.append(0)
        else:
            num_ones.append(1)
            num.append(1)

    count_zeros = 0
    count_ones = 0
    for i in num_zeros:
        count_zeros += 1

    for i in num_ones:
        count_ones += 1

    print(count_zeros, num_zeros)
    print(count_ones, num_ones)
    print(num)


def num_10000():

    a = np.random.randn(10000)
    b = list(a)


    count1 = 0
    count2 = 0
    count3 = 0
    count4 = 0
    count5 = 0
    count6 = 0
    count7 = 0
    count8 = 0
    count9 = 0
    count10 = 0
    count11 = 0
    count12 = 0
    count13 = 0
    count14 = 0
    count15 = 0
    count16 = 0
    count17 = 0
    count18 = 0
    count19 = 0
    count20 = 0


    for i in b:
        if (i >= -2.0 and i < -1.8):
            count1 = count1 + 1
        if (i >= -1.8 and i < -1.6):
            count2 += 1
        if (i >= -1.6 and i < -1.4):
            count3 += 1
        if (i >= -1.4 and i < -1.2):
            count4 += 1
        if (i >= -1.2 and i < -1.0):
            count5 += 1
        if (i >= -1.0 and i < -0.8):
            count6 +=1
        if (i >= -0.8 and i < -0.6):
            count7 += 1
        if (i >= -0.6 and i < -0.4):
            count8 += 1
        if (i >= -0.4 and i < -0.2):
            count9 += 1
        if (i >= -0.2 and i < 0.0):
            count10 += 1
        if (i >= 0.0 and i < 0.2):
            count11 += 1
        if (i >= 0.2 and i < 0.4):
            count12 += 1
        if (i >= 0.4 and i < 0.6):
            count13 += 1
        if (i >= 0.6 and i < 0.8):
            count14 += 1
        if (i >= 0.8 and i < 1.0):
            count15 += 1
        if (i >= 1.0 and i < 1.2):
            count16 += 1
        if (i >= 1.2 and i < 1.4):
            count17 += 1
        if (i >= 1.4 and i < 1.6):
            count18 += 1
        if (i >= 1.6 and i < 1.8):
            count19 += 1
        if (i >= 1.8 and i <= 2.0):
            count20 += 1

    sum = count1 + count2 + count3 + count4 + count5 + count6 + count7 + count8 + count9 + count10 + count11 + count12 + count13 + count14 + count15 + count16 + count17 + count18 + count19 + count20
    # print(b)
    print("-2~2范围内以0.2为间隔，各个间隔内数的个数为：",count1,count2,count3,count4,count5,count6,count7,count8,count9,count10,count11,count12,count13,count14,count15,count16,count17,count18,count19,count20)
    print("二十个数据之和为：", sum)






if __name__ == "__main__":
    num_100()
    num_10000()


    # 上述空列表的创建可由下面代码完成
    list = [[] for _ in range(20)]

    for i in range(20):
        print(list[i])

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