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Python3 generator and python3 Generator 1 ''' 2 list generation type 3''' 4 5 # a1 = [x for x in range (10)] 6 # a2 = [x * 2 for x in range (10)] 7 # print (a1) 8 # print (a2) 9 #10 # def fun1 (x ): 11 # return x ** 3 12 # a3 = [fun1 (x) for x in range (10)] 13 # print (a3) 14 #15 # list generation type 16 # Value Method 17 # B = ['asd ', 8, 9, 10] 18 # w, x, y, z = B 19 # print (w, x, y, z) 20 # print (B)

Python iterator, generator and decorator, and python generator Decoration 1. Principles and usage of the iterator:1> principle:An iterator is a way to access a set element. The iterator object is accessed from the first element of the set until all elements are accessed. The iterator can only move forward and not backward, but that's nothing. People seldom step back on the iteration process. In addition, th

Self-compiled DAL three-tier code generator and dal three-tier Code Generator (1) Create your own solution directory structure as follows: (2) Compile the Code: (To use a database, we recommend that you create any database) The code for creating the configuration file App. config is as follows: The MainWindow. xaml code is as follows: (change the code in the Grid in MainWindow. xaml) The MainWindow. xa

Python list derivation and generator expression usage example, python Generator This article describes the Python list derivation and generator expression usage. We will share this with you for your reference. The details are as follows: Like the list,List DerivationIt is also represented by square brackets [] and uses a abbreviated for loop. The first part is an

GeneratorGenerator function: The function body contains the yield keyword, the result of which the function executes is the generator, which is essentially an iterator.deffoo ():Print('First ------>') yield1Print('Second----->') yield2Print('Third----->') yield3Print('fouth----->') G=foo () fromCollectionsImportIteratorPrint(Isinstance (g,iterator))Print(g)Yield Features:1. Similar to return, can return a value, but the difference is that the

Additional example of listening file enddeftail (): F= Open ('file','R', encoding='Utf-8') F.seek (0,2) whileTrue:line=F.readline ()ifLine :yield LineImportTime Time.sleep (0.1) G=tail () forIinchg:Print(I.strip ())Send methodSend method:deffunc ():Print('*'*10) A=yield5Print(a)yield10g=func ()Print(g.__next__())Print(G.send ('Wenwen'))#print (g.__next__ ())From which yield begins to execute, send passes a value to the yieldSend cannot be used in the first touch generatorThe number of yield

PHP Generator Simple instance, PHP generator Generally when you iterate over a set of data, you need to create a data, assuming that the array is large, it consumes a lot of performance, or even causes memory shortage.Copy the Code code as follows:Fatal error:allowed memory size of 134217728 bytes exhausted (tried to allocate + bytes) in E:\php\test\index.php on L INE 5Range (1, 100000000); PHP5.5 implemen

Four arithmetic question generator (C ++) and four arithmetic question Generator Question: Four arithmetic question generator. Idea: Use the rand () % 100 function to generate a random positive integer of less than 100. Likewise, use the random function rand () % 4 to generate random 0, 1, 2 and 3 are random integers corresponding to the four conditions of additi

Simple PHP generator instance, php Generator Generally, when you iterate a set of data, you need to create a data. If the array is large, it will consume a lot of performance, and even cause insufficient memory.Copy codeThe Code is as follows:// Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 32 bytes) in E: \ php \ test \ index. php on line 5Range (1, 100000000 ); PHP5.5

{/// ///The code generator interface, which is used to complete code generation. /// Public InterfaceICodeGenerator {/// ///The code scheme name. /// stringName {Get; } /// ///Generates code for generating data table objects and table column information. /// /// table information. /// work item information. /// generate code results. stringGeneratcode (rootentity rootentity,projec

PHP hexadecimal random color generator function example, hexadecimal Generator This example describes the PHP hexadecimal color random generator function. We will share this with you for your reference. The details are as follows: Running result: #8ABED4 PS: Here are some related color tools for your reference: RGB color encoding generator:Http://tools.jb51

In the process of learning mybatis, it is found that MyBatis is really a very useful framework, but the handwriting map file is very error-prone, so you can use the MyBatis generator to automatically generate entity classes, DAO interfaces, and mapping mapping files. This can save a lot of effort, copy the generated code to project engineering. Of course, there are similar plugins on eclipse, but I chose generator