Python random number generation

1.random.random()

import random
print random.random() #0.834407670706

This is a simple creation method, but we usually need to parameterize a set of random numbers and specify a range to create random numbers.

2.random.uniform()

import random
print random.uniform(1,10)#2.27698969238

This method is to generate a random number in a specified range, float type.

import random
print random.randint(1,10)#3

The difference between this and the above is that a random integer is generated.

3.random.range()

import random
print random.randrange(10,1,-3)#10

This method can generate random numbers according to the specified step size.

4.random.choice()

item=[1,2,3,4,5]
print random.choice('nihaowangwentao')#e
print random.choice(item)#5

This method is to select one from the given list as a random number, but it also has a disadvantage that it can only be generated individually.

5.random.shuffle()

import random
item=[1,2,3,4,5]
random.shuffle(item)
print item#[4, 1, 3, 5, 2]

Given a list, shuffle the list.

6.random.sample()

import random
item=[1,2,3,4,5]
print random.sample(item,2)#[4, 5]

This method is to randomly select a specified number of random numbers in a given list.

7. Application - parameter one-dimensional random number

# _*_ coding:utf-8 _*_
import random
def dataint(down,up,k):
    """
    产生多维随机整数
    :param down:
    :param up:
    :param k:
    :return:
    """
    data=[]
    for i in range(k):
        temp = random.randint(down, up)
        data.append(temp)
    return data
print dataint(1,10,10)#[7, 1, 2, 8, 2, 4, 2, 8, 4, 9]

This is to generate a set of multidimensional random numbers,

# _*_ coding:utf-8 _*_
import random
def dataint(down,up,k):
    """
    产生多维随机整数
    :param down:
    :param up:
    :param k:
    :return:
    """
    data=[]
    for i in range(k):
        temp = random.uniform(down, up)
        data.append(temp)
    return data
print dataint(1,10,10)#[7.963157134285984, 7.668861729299904, 2.0627102553927257, 6.3624214066153035, 4.197435315071023, 4.169695244423517, 3.6555993007085474, 3.0851608684981655, 6.1487965864173075, 7.113803486261753]

This is an array of type float.

8. Generate a random array in the form of a matrix

# _*_ coding:utf-8 _*_
import random
import numpy as np
def dataint(down,up,k):
    """
    产生多维随机整数
    :param down:
    :param up:
    :param k:
    :return:
    """
    data=[]
    for i in range(k):
        temp = random.uniform(down, up)
        temp1 = random.uniform(down, up)
        data.append([temp,temp1])
    return data
data=dataint(1,10,10)
data=np.array(data)
data=data.tolist()
print data

Here we use it twice to generate random arrays.

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Reposted from blog: https://www.jianshu.com/p/374335e3be57