random | 易学教程

Random module not working. ValueError: empty range for randrange() (1,1, 0)

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问题 In Python 2.7.1, I import the random module. when I call randint() however, I get the error: ValueError: empty range for randrange() (1,1, 0) This error is caused by an error in the random.py module itself. I don't know how to fix it, not does reinstalling python help. I can't change versions. can someone please give me code for a working module or tell me what to do? 回答1: You called randint like this: randint(1,0) That tells randint to return a value starting as 1 and ending at 0. The range

JMX enabled Java application appears to open a random high order port when JMX client connects

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问题 JMX enabled Java application appears to open a random high order port when JMX client connects I have successfully configured a helloworld JMX enabled program, and I can connect to it using jconsole JMX client from a remote location. When I attempt to turn on iptables I noticed that a random high order port is established when a client logs in. Eventually I would like to monitor Java applications in firewall segregated network segments. Can we control the range the random port opens in? I'll

Advantage of using static variables in Java

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问题 Say I have two classes like this: class A{ private static Random random = new Random(); public A(){ // Do something. } public Integer methodGetsCalledQuiteOften(){ return random.nextInt(); } } class B{ private Random random; public A(){ random = new Random(); // Do something. } public Integer methodGetsCalledQuiteOften(){ return random.nextInt(); } } In a scenario where both of them get instantiated multiple times and both of these classes' instances' method methodGetsCalledQuiteOften gets

Results not reproducible with Keras and TensorFlow in Python

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问题 I have the problem, that I am not able to reproduce my results with Keras and ThensorFlow. It seems like recently there has been a workaround published on the Keras documentation site for this issue but somehow it doesn't work for me. What I am doing wrong? I'm using a Jupyter Notebook on a MBP Retina (without Nvidia GPU). # ** Workaround from Keras Documentation ** import numpy as np import tensorflow as tf import random as rn # The below is necessary in Python 3.2.3 onwards to # have

使用随机数生成1/2概率

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使用 java.util.random 类它的一个 nextBoolean() 方法,可以伪随机地生成并返回一个 boolean 值。值 true 和 false 的生成概率（大致）相同。 Random 类按如下方式实现 nextBoolean 方法： public boolean nextBoolean() {　　//next()方法中的参数是一个int类型的 bits,它在1~32(包括)之间时,产生的每个位值是0或1的机会大致相等。 return next(1) != 0; } 可以这样使用它： private Random rand = new Random(47); if(rand.nextBoolean()) { //... } 来源： https://www.cnblogs.com/lemos/p/6350144.html

day 16 包，random，shutil

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包：　函数过多，可以分模块文件去管理函数，模块文件过多，将模块文件分类放在一个个的文件夹中，这个文件夹就叫做包，组织结构更加清晰，合理！　　模式就是被别人使用，包既然是一些模块的集合，也是被调用。　　文件：　　　　1、被别人使用　　　　2、当做脚本自己使用　　　　执行文件运行时，会将执行文件的当前目录记载到sys.path的列表中包也是模块，他是模块的集合体，所以引用包也会反生三件事情: 1、创建一个以包名命名的名称空间 2、执行包中的__init__文件，将__init__里面的代码块，加载到以包名命名的名称空间中 3、调用包内的名字必须通过包名. 的方式 # 想要在此文件引用 bbb包的m3模块怎么做？ # 第一步在此文件 import aaa # 第二步：在aaa 的 __init__ 添加 from aaa import bbb # 第三步：在bbb 的 __init__ 添加 from aaa.bbb import m3 # 完成以上三步，那么我在此执行文件就可以引用bbb包的m3模块里面的名字。 # aaa.bbb.m3.func3() # 上面的需求满可以这么做： # from aaa.bbb import func3 # m3.func3() 总结： 1、from a.b import c . 的左边一定十个包

day 16 包，random，shutil

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Android: Set Random colour background on create

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问题 What I want is when I load my app up it to randomly have a certain colored background from a predefined list of strings stored in a values xml file called colours. What I currently have is one colour set as the background defined through the string colour code using the gui editor in eclipse. For the life of me can't work out how to get the background to randomly pick one of the 9 strings and display it each time the activity is activated. Guidance on this would be invaluable. 回答1: In colors

Android: Set Random colour background on create

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Creating array of length n with random numbers in JavaScript

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问题 Following up on this answer for creating an array of specified length, I executed the below to get a corresponding result but filled with random numbers, instead of zeros. var randoms = Array(4).fill(Math.floor(Math.random() * 9)); Well, mathematically speaking it's random , all right. But I'd like the randomness to be visible within the array and not only between runs, of course. Stupid computer... Don't do what I say. Do what I want! I can iterate and put it my random (and varying) values.