10 articles about duck type recommended

In program design, Duck type (English: Duck typing) is a style of dynamic type. In this style, an object's valid semantics are not inherited from a particular class or implemented by a particular interface, but rather by the collection of current methods and properties. The concept comes from the duck test presented by James Whitcomb Riley, "duck test" can be said: "When you see a bird walking like a duck, swimming like a duck, barking like a duck, then this bird can be called a duck." "In duck type, the focus is not on the type of the object itself, but how it is used. For example, in a language that does not use duck type, we can write a function that takes an object of type duck and invokes its method of walking and calling. In a duck-type language, such a function can accept an arbitrary type of object and invoke its method of walking and calling. If the method that needs to be called does not exist, a run-time error is raised. Any object that has such a correct way of walking and calling can be accepted by a function which leads to the above expression, and hence the name of this type of decision. Duck types usually have to be

1. A detailed description of the duck type in Python

Introduction: In program design, Duck type (English: Duck typing) is a style of dynamic type. In this style, an object's valid semantics are not inherited from a particular class or implemented by a particular interface, but rather by the collection of current methods and properties. The concept comes from the duck test presented by James Whitcomb Riley, "duck test" can be said: "When you see a bird walking like a duck, swimming like a duck, barking like a duck, then this bird can be called a duck." "In duck type, the focus is not on ...

2. Introduction to PHP Development-environment Construction diagram

Introduction: Contact PHP Nearly a year, has been interrupted to learn. Recently, because the company needs web-related development, and the current team does not have the relevant personnel. Had to gig, just have a further study of PHP opportunities. At the same time I also initiated the idea of writing a PHP tutorial, to improve their own at the same time to help others. Of course, this is only the entry-level, the great god please ignore. The following into the topic, that is, any development of the first step, the environment to build, as a beginner, we use the simplest and most stupid way bar. 1, download Wampserver. W is win

3. Detailed explanation Duck typing duck type programming and Python implementation

Introduction: This article mainly introduces the detailed duck typing duck type programming and Python implementation example, duck type refers to the interpretation of the language of a programming style, the need for friends can refer to the following

4. Detailed description of Python's duck type

Summary: It is believed that Python's developers are familiar with Python's duck type, and that the duck type is exactly defined in Wikipedia as a style of dynamic typing. In this style, an object's valid semantics are not inherited from a particular class or implement a particular interface, but rather by the "collection of current methods and properties". So this article gives you a Python duck type.

5. The company will use PHP to do some development, start learning PHP

Introduction: The company to use PHP to do some development, began to learn PHP because of business needs, the company needs to use PHP to do development. But temporarily haven't been able to recruit a good PHP programmer, so I have to gig, learning PHP, temporary can block, if you can learn in-depth. Make a simple record. In order to be good at urging yourself to learn. Because of the years of web development experience, for a short time to master PHP

6. Where does WordPress start? Solution Ideas

Introduction: Where does WordPress start? PHP page using the functions provided by WordPress, I am the front-end, is not clear, but now have to gig do not understand, you big God to give a proposal. Where does WordPress come from? Wordpress.... ------Solutions----------------------WordPress is a blog platform developed using PHP language, users can support PHP and MySQL data

7. Dump data from the MySQL database of a remote Linux service

Summary: Today's new task requires the data from the MySQL database to be imported locally from the remote server. It was a bit of a gig feeling. Because there was hardly any contact with MySQL before,

8. Phpwind integration of the most Earth system user synchronous Login Implementation method

Introduction: My task is to let Phpwind and the most Earth log in sync, the leadership also know that my technical ability is limited, not high requirements, so let me first realize, and then consider the other. Gig, it's starting.

9. Should a Pythonic class not be checked for parameter validity in __init__?

Introduction: I know that according to the Duck type principle, the parameter type should not be checked. But should you check the validity of the parameters in other ways? Example: Class Comment (Object): ... def __init__ (self, content, creater, ipaddress): ... self.content = content ... self.cr Eater = creater ... self.ipaddre

10. Several JSP introductory knowledge summary _mysql

Introduction: From Last September, I began to learn JSP, before there is only a little awareness of the program, along the way, after a lot of hardships, and finally one day, I like a dry duck learn to swim, in the heart of incomparable happy, endure a few nights, finally written this pure JSP article release program. I believe that the following few small knowledge to me such a level of rookie has a certain help! =

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