default argument

FunctionReference:#########################################################Http://www.w3cschool.cc/python/python-functions.htmlHttp://developer.51cto.com/art/200809/88052.htmHttp://www.pythondoc.com/pythontutorial27/controlflow.html#tut-functionsHttp

1. Initial functionHow do we implement a piece of code before we have a function? We learned the Len () method before we can find the length of a list, and if there is no Len () method, then we have to write a similar function code to achieve the

Default parameters for the function:1. The default parameter of the function must be placed to the right of the formal parameter and cannot appear on the right side of the default parameter without the default parameters2. If the declaration of a

A function that contains a list of variable argumentsif the last member in the function declaration is an ellipsis (...), the function declaration can take a variable number of arguments. In these cases, C + + only provides type checking for

This article describes the potential hazards of using the Mutable object as the default value of the Python function parameter, and its implementation principles and design objectivesTrap Recurrence Let's use practical examples to illustrate the

Notes will continue to update, there are errors in the place welcome corrections, Thank you! constructors and copy control Virtual destructor Destructors in the inheritance system should be defined as virtual functions.As I've said before, defining

# # #指针和引用的区别1. The pointer is a variable that stores the address pointing to the data, and the reference is simply an alias of the original variable, which is essentially the same as the original variable.2. Pointers can be multilevel, reference

function parameters in the actual application process is also relatively broad, such as in the registration, some information to fill, some of the parameter types are required parameters, some variable parameters, some default parameters, and so on,

Anonymous objects: Temporary objects are usually released when they are constructed (special case, return value optimization)1. Return value optimization: If the anonymous object returned by the function returns with a new object of the same type,

//1. Control memory allocation://A: Some applications have special requirements for memory allocation, so we cannot apply the standard memory management mechanism directly to these programs. They often require custom memory allocation details, such

The so-called overloading, is to give new meaning. function overloading allows a function name to have multiple functions and perform different operations under different circumstances. Operator overloading (Operator overloading) is also a reason

Python Advanced functions This section Introduction to Functions Creation of functions function parameters and return values LEGB Scope Special functions Function-Type programming 1. Introduction to FunctionsWhy do

User collation of the standard https://www.douban.com/note/134971609/PEP8 Python Coding SpecificationA code orchestration1 indent. Indentation of 4 spaces (the editor can do this), no tap, no mix of taps and spaces.2 The maximum length per line is 79

//1. A function defined inside a class is implicitly inline. //2. By default, the type of the this pointer is a constant pointer to a very version of the class type. The const member function for a class is declared by placing the const in the

Python built-in functions Dir (_ builtins __) 1. 'abs '. Obtain the absolute value of the input parameter. abs(x, /) Return the absolute value of the argument. 1 >>> abs(10)2 103 >>> abs(-10)4 10 2. 'all' is used to determine whether all elements

New users think it is simple, but it is actually not as simple as C. What are the knowledge, habits, and details of beginners and veterans? Thank you! New users think it is simple, but it is actually not as simple as C. What are the knowledge,

OverviewHere is to record some of my development process encountered some of the details and code optimization problems, I hope to share with June.Copyright noticeCopyright belongs to the author.Commercial reprint please contact the author for

Read the doc of the function itself.Copy codeThe Code is as follows:Getattr (object, name [, default])-> value Get a named attribute from an object; getattr (x, 'y') is equivalent to x. y.When a default argument is given, it is returned when the

Limitations of copy arguments (value passing)Scenarios that are not suitable for copying arguments include: When you need to modify the value of an argument in a function. When a large object needs to be passed as an argument. For

About judging and looping statementsPython's judgment and looping statements are very intuitive and read close to natural language.Judgment statement ifThe standard if statement is the following structure:if expression: if_suiteIf expression is