effective python

Effiective C # Item1: Using attributes instead of member variablesEffective C # ITEM2: Run constant (readonly) better than compile constant (const)Effective C # Item3: operator as or is better than castEffective C # ITEM4: Using conditional attribute instead of # if conditional compilationEffective C # ITEM5: Always provide the ToString () methodEffective C # ITEM6: Discriminating the use of value types and reference typesEffective C # Item7: Implemen

October 11, 2014 After the 11th holiday, we would like to report some summary information about EC2 maintenance updates and some effective measures to improve system availability. In September 30, we restarted less than 10% of EC2 instances to prevent any security risks related to xen security notification (XSA-108. According to the relevant security notification disclosure mechanism of xen, we are obligated to comply with the confidentiality r

Seven philosophical stories about effective communication Effective communication is a basic problem that enterprise management and our individual often encounter in social life. It is not easy to achieve real communication between people. The following simple and profound stories may be more direct to you than the professional articles written by other communication experts, and have a shocking effect and

A programmer who has been working in a foreign company for two or three years turned to me for help and said he was overwhelmed by the increasing pressure from promotions, superiors, and code writing, after working for more than 10 hours every day, my mind and body are almost exhausted. I have tried many ways and it is still difficult to get rid of the psychological pressure. In fact, this situation exists in many developers more or less, and everyone does not want to be at a disadvantage in the

A simple and effective solution to "google snapshot cannot be opened ~ As we all know, it has been a long time since google snapshots could not be opened. Here we provide a very simple method to re-display long-overdue snapshots. Click "Web snapshots" and will the http://webcache.googleusercontent.com/search in the address bar? Change Https://webcache.googleusercontent.com/search? (That isAdd an s after http). This method may not be available in

Excel Charts-how to create professional and effective business charts (stay away from ugly charts to satisfy customers and raise their salary) Basic Information Author: Liu Wanxiang [Translator's introduction]Press: Electronic Industry PressISBN: 9787121104633Mounting time:Published on: February 1, April 2010Start: 16For more details, see: http://www.china-pub.com/196541Wonderful sample reading: http://www.china-pub.com/computers/common/mianfeisd.as

Method 1: Make the/etc/profile file effective immediately after modification method 1: www.2cto.com make the/etc/profile file effective immediately after modification, you can use the following command :#. /etc/profile Note :. and/etc/profile have space method 2: Make the/etc/profile file take effect immediately after modification, you can use the following command: # source/etc/profile attachment: use the

English Original: Effective Ways to Improve Your programming　　1. Never stop learning and reading　　read Books, not just websites　　read only for self-promotion, not for the next project　　reading improves your foundation, not just the latest technology　　2. Work with people smarter than youWorking with someone smarter than you or a more experienced person can help you improve quickly.　　3. Become a versatileDon't get too bogged down, which may keep you fro

In many cases, testers are launchingAutomated TestingI started to do this without thinking about it.You can play back the script without considering it.ValidityBut it may not be effective if you do it.Automated Testing does not play a role in the entire test, so even a small investment is wasted.Resources. Therefore, before conducting automated testing, you must carefully consider some issues to ensure its effectiveness: 1. Is the tested system suita

It was originally a story for a mother to educate her son. It was also a touching story, but it could be used as an effective communication case. My son is eager to go home and does not answer her mother's phone. Therefore, she often calls her son to talk about her mother's feelings. She wants to get angry when she does not answer her phone. After many communications, the son accepted his mother's opinion and returned home on time or told her where to

pad to see the skin become delicate and tight.Effective Method 4: shrink pores of egg almondsCombine the almonds into powder, mix them with the egg and paste them into a paste to form a mask. Then clean your face and apply the egg almond mask to your face. After 20 minutes, clean the face with water, which can effectively shrink pores, and tighten the skin.Effective pore shrinking method 5: Honey oatmeal pores shrinkingAdd a little water to the honey and mix it with oatmeal. After cleansing, ap

Tags: Working algorithm design technical method experience mobile phone c Process The principle of effective continuity is described as follows:1) continuous operations should not be interrupted, and all parts of the object should be at full capacity;2) Remove all idle and intermediate actions:3) Replace "Back and forth" with cyclic actions: This principle can look at the opposite of Principle 19. We can check the intermittent moments of the system,

-we might call it standard C + + 1.1. If you're not familiar with TR1 functionality, you can't be called a effective C + + programmer, because the functionality in TR1 is a benefit for all kinds of libraries and applications.2. What is in the C++98 standard library?Before examining what is TR1, it is valuable to review the main parts of the c++98 version of the standard library: Standard Template Library (STL), containing containers (VECTOR,S

"52 Effective ways to write high-quality iOS and OS X code" notes, read it over again, feeling the impression is not particularly profound, write down notes.The structure of this number is very clear, 5 chapters 52 suggestions, points to write the recommendations of efficient code, each point after the summary, here simple record these summary, easy to review.Because of time, write 5 first, there is time to gradually add in.Chapter One: Familiarity wi

this series as effective JavaScript 's reading notes. Suppose you need to Item in the Actor object to join a ID Information:function Actor (scene, X, y) {this.scene = Scene;this.x = X;this.y = Y;this.id = ++actor.nextid;scene.register (this);} Actor.nextid = 0;at the same time. You also need to include the ID information in the Actor 's subtype Alien :function Alien (scene, X, y, direction, speed, strength) {Actor.call (this, scene, X, y); this.direct

this series as effective JavaScript 's reading notes. CSV data is usually delimited by some sort of delimiter. Therefore, when implementing CSV Reader , you need to support different delimiters. A very natural implementation, then, is to use the delimiter as a parameter of the constructor. function Csvreader (separators) {this.separators = separators | | [","];this.regexp =new regexp (This.separators.map (function (Sep) {return "\ \" + sep[0];}). Join

This is my review of "effective OBJECTIVE-C 2.0" Summary and summary, if in doubt, I will attach an example explanation.First, familiar with Objective-c Understand the origins of the Objective-c language Objective-c adds an object-oriented feature to the C language and is a superset of it. Objective-c uses a dynamically bound message structure, which means that the object type is checked at run time. What code should be execute

(finalizer chaining)" is not automatically executed. If the class (not object) has an finalization method, and the subclass overrides the finalization method, the child class's finalization method must call the superclass's finalization method manually. The subclass is terminated in a try block, and the end method of the superclass is called in the corresponding finally block. Guarantees that the superclass's finalization method will be executed even if the subclass's finalization process throw