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Python list generation, generator

List-generated--A list can be generated quickly , and another listcan be deduced from a list , and the code is simple:>>> [x * x for x in range (1, 11)][1, 4, 9, 16, 25, 36, 49, 64, 81, 100]>>> [x * x for x in range (1, one) if x% 2 = = 0][4, 16, 36, 64, 100]>>> [m + N for M in ' ABC ' for n in ' XYZ '][' AX ', ' AY ', ' AZ ', ' BX ', ' by ', ' BZ ', ' CX ', ' CY ', ' CZ ']Generator (Generator)--wit

Hibernate-----Hibernate primary Key Generator

primary key generator to generate auto-grow primary keys if the type of the data column is long, short, or intScope of use: requires that the underlying data system must support autogrow field types. And it requires the underlying database to define the primary key as the autogrow field typenativeChoose to use identity, sequence, or Hilo identity Fuzhou Builder, depending on the underlying database's ability to automatically generate identifiers. mec

Python full Stack road 8--iterator (ITER) and generator (yield)

First, Generator (ITER)From Python2.2 onwards, the generator provides a concise way to help return the function of a list element to complete simple and efficient code.It is based on the yield instruction, allowing the STOP function and returning the result immediately.This function saves its execution context and, if necessary, resumes execution immediately.1, compare range and xrange difference>>> print R

Python iterator generator (GO)

Reprint: The original writing is good!Original address: Http://www.cnblogs.com/kaituorensheng/p/3826911.html#_label0Read Catalogue 1. iterators 2. Generator 3. Reference Back to top of 1. IteratorsIterators are a way to access the elements of a collection. An iterator object is accessed from the first element of the collection, knowing that all of the elements have been accessed and finished. Iterators can only move forward witho

Python Learning path-yield generator, iterator

GeneratorThe result is saved to the state of the generator, and the yield in the normal function becomes the generator.1. Xrange in Python 3.3 has been merged into range.1 i = range (2)print (i)34 =>range (0, 10)2. Yield generator.1 deffunc ():2 Print(111)3 yield14 Print(222)5 yield26 Print(333)7 yield38 return " Done"9 TenK =func ()

Design Pattern Learning Notes Generator pattern

Generator ModeEncapsulates a product's construction process and allows for construction by step. Separates the construction and presentation of a complex object so that the same construction process can create different representations.Four types of roles in the builder pattern structure :Product: The complex object that you want to build.Abstract Builder: An abstraction builder is an interface that defines methods for returning a product object in

Speed up development with mybatis-generator tools

When using MyBatis, it is necessary to write a large number of mapping mapping files, manual writing is heavy and error prone. Fortunately, Mybatis-generator can be used to help us automatically generate these files, greatly improving the efficiency of development.1. Preparatory workDownload the Mybatis-generator jar package from https://github.com/mybatis/generator

[Serialization] An example of FPGA-based series-sequential Pulse Generator

[Serialization] FPGA OpenGL series instances Sequence Pulse Generator Based on OpenGL I. Principles In a digital circuit, a circuit that can output pulse waveforms in turn in a certain order of time is called a sequential pulse generator. In digital systems, it is often used to control certain devices to perform operations or operations in the order specified in advance.A sequence pulse

. Net Code Generator

From: tsingsunli's blog 1. Code Smith The most famous foreign businessCodeGeneratorHttp://www.codesmithtools.com/ 2. mygeneratoe The most famous free code generator in ChinaHttp://www.mygenerationsoftware.com/portal/default.aspx 3. Dynamic Soft. Net Code Generator The most popular free code generator in ChinaCodematic is a C # DatabaseProgramThe Autom

Automatic generation of Table instance classes and mapping files using Mybatis-generator

We often use MyBatis to do the program code level to the database operation, but need to write a large number of Table instance class and mapping file, now use tool Mybatis-generator to achieve the above file automatic generation, the following is a brief introduction to the use of the method.1. Create a projectIn order to download the jar package is convenient, I create a maven project called MyBatis to apply Mybatis-

Construct a random generator

http://m.blog.csdn.net/blog/u012605629/40406577Construct a random generator2014-10-23 Read 83 comments 02. A random generator is known, the probability of generating 0 is P, the probability of generating 1 is 1-p,Now you want to construct a generator,So that it constructs 0 and 1 probability are 1/2;Constructs a generator, makes it constructs 1, 2, 3 probability

[Ruby on Rails series]6, a simple code-word generator and interpreter (above)

"0" Ruby on Rails series review[Ruby on Rails Series] 1, Development environment preparation: Installation of VMware and Linux [Ruby on Rails series] 2, development environment preparation: Ruby on Rails development environment configuration [Ruby on Rails series]3, initial rails: Developing the first Web program using Rails [Ruby on Rails series]4, featured: Internationalization of rails applications [i18n] [Ruby on Rails series]5, topics: Talk about SaSS"1" Task targetThe main is to implement

Pure linear homogeneous random number generator

Introduction to linear homogeneous random number generator: The old LCG (linear congruential generator) represents the best and simplest pseudo-random number generator algorithm. The main reason is that it is easy to understand, easy to implement, and fast. The LCG algorithm is based on the formula: X (n + 1) = (A * x (n) + C) % m The coefficients are as follows

Net Code Generator

1. Code Smith The most famous foreign businessCodeGeneratorHttp://www.codesmithtools.com/CodeSmithProfessional-41.rarCodesmith.professional.v4.1.2.keygen.rar 2. mygeneratoe The most famous free code generator in ChinaHttp://www.mygenerationsoftware.com/portal/default.aspxDownload mygeneration_1303.exe 3. Dynamic Soft. Net Code Generator The most popular free code

Mybatis-generator-gui-an interface tool for Automatic Generation of mybatis code, mybatisgeneratorgui

Mybatis-generator-gui-an interface tool for Automatic Generation of mybatis code, mybatisgeneratorgui What is mybatis-generator-gui? Before introducing mybatis-generator-gui, it is necessary to introduce what is mybatis generator (you can skip this section if you are familiar with it ). we all know t

In-depth understanding of js generator data types and jsgenerator

In-depth understanding of js generator data types and jsgenerator 1. Overview Generator is a new data type introduced by ES6. It looks like a function. In addition to return, yield can return multiple times. Generator is defined by function * (note ), 2. Example The function cannot save the status, and sometimes the global variable is required to save the number;

[Record] the production process of the random number dummy file generator.

Document directory Cause... My random false text generator has officially released the access address: http://bugunow.com/lipsum Cause... Two days ago, I designed a style draft for my website. When I thought that the space on the page wanted to hold some text, I spent a lot of time looking for materials. at this time, I thought that I first saw a false document generation tool on a blog of an Taiwan cell (I don't remember the website), so I sear

Automatically generate model mapper mapping files using generator

1. Download the package addresshttp://download.csdn.net/detail/u012909091/72060912. Download and unzip the file to any directory3. Delete all files under mybatis-generator-core-1.3.2\mybatis-generator-core-1.3.2\lib\src 4. Modify the configuration file Mybatis-generator-core-1.3.2\mybatis-generator-core-1.3.2\lib\gener

Springboot integrated MyBatis and MyBatis generator

Integrate MyBatis + generator with the basic Spring boot framework built1. Set up the relevant configuration of Maven:File-setting-mavenSet up Maven home directory and setings file. (The use of tips:maven involves the contents of the Hosts file)2. Add related dependencies and configuration information of plug-ins in pom fileDependencies> Dependency> groupId>Org.springframework.bootgroupId> Artifactid>Spring-boot-starter-webArtifactid>

Python function (11)-Generator

First look at what is a list-generated>>> [i*2 for I in range (][0), 2, 4, 6, 8, ten,,,, 18]>>> a=[]>>> for I in range (10):. .. A.append (i*2) ...>>> a[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]This code to achieve the effect of three code, this code is a list of generatedList if there is too much data, it takes up a lot of storage spaceIf you take only some of the data from the list, the storage space used by the other unused data takes upThe generator

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