Python

introduction

Python has scripting language in the most abundant and powerful class library, sufficient to support most everyday applications. Its name comes from a comedy, perhaps the original design Python this language and didn't think today Python will in industrial and scientific research get so widely used. The famously liberal software author the Eric Raymond in his article, "how to become a hacker", will Python as hacker should study is one of the four programming language, and advise people from Python began studying programming. This really is a relevant Suggestions, for those who have never learned programming or not of computer professional programming learners are concerned, Python is best choice one.

As a programming language design positioning

Although Python can be roughly classified as "scripting language", actually some large-scale software development plan for example Zope, Google, Mnet and BitTorrent, also widely used it facebook. Python supporters prefer to say it is a kind of advanced dynamic programming language, reason is "scripting language" only a simple programming tasks tuyuhun language, such as shells script, JavaScript etc can handle only simple task of programming language, and can't equate with the Python.

Billiards sports origin

Billiards originated from Britain, it is an internationally widely popular decorous indoor sports. Is a cue ball on the stage, rely on the calculation result of the competition of scoring sure indoor recreational sports.

About in the 14th century, allegedly by a London named the pawnbroker Billsyard for recreation and invention, billiards of English name that comes from this. Until 18th century, billiards, as a kind of game in Britain was very popular folk. In the early nineteenth century, the world's first public billiards room opened in London. The earliest billiards, table after only two white balls, French feel to lack challenging, add a red ball and improve their game. British people back again to develop it become the very popular fall in today's bag billiards.

Canoes movement fitness of choice

Kayak points kayak and rowing two projects, kayak are athletes sitting compartment in two row with blades, push forward the paddle boat hull athletes with two hands is worried a single propeller blades and hull forward. Canoes movement developed from the canoe, is human productive labor and daily life of a kind of water transportation, the priority of using kayak the eskimos North America, the earliest kayaks are made with animal skins, bone, have a plenty of with the whole tree carefully chiseled and become, its development and people roaming about Europe in northern waters.

Afterwards, "modern kayak" father of Scots John. Michael gray GeZao a 4 meters long, 75 centimeters wide, 30 kilos of "Enoch bunol - Iraq" kayak, during 1864 to 1867 traveled British waters, and travel to France, Germany and Sweden. So far, canoes movement has more than 100 years history.

UDP (User Datagram Protocol)

UDP (User Datagram Protocol) is the OSI reference model a connectionless transport layer protocol, provide oriented affairs of simple unreliable transmit information service. It is an IETF RFC 768 the formal regulations is UDP.

User data submitted to agreement

UDP is ISO reference model a connectionless transport layer protocol, provide oriented affairs of simple unreliable transmit information service. UDP protocol is basically the IP protocol and the upper level protocol interfaces. UDP protocol for ports in the same device distinguish operation on multiple applications.

introduction

UDP protocol's full name is the user data submitted to agreement, in the network it with TCP protocol as used for handling packets. In the OSI model, in the fourth layer - the transport layer, in the IP protocol of a layer. UDP have not provide data submitted to grouping, assembly and unable to sort of data packets faults, that is, when messages are sent after, not know whether its safety integrity to arrive. UDP used to support those who need the data transfer between computers network application. Including the network video conference system, the numerous client/server model of network application all need to use the UDP protocol. UDP protocol from published so far has been used for many years, although its original luster has been some similar agreement covered, but even today, UDP can still be a very practical and feasible network transport layer protocol.

With known TCP (TCP) agreement is same, UDP protocol is located directly Internet protocol (IP) agreement of top. According to the OSI (OSI) reference model, UDP and TCP belong to the transport layer protocol.

UDP protocol's main function is to network data flow compressed into data submitted to form. A typical data submitted to is a binary data transmission units. Each data submitted to the first 8 bytes to contain header information, the remaining byte is used to contain specific data transmission.

Nokia Ovi

Ovi nokia launched the Internet service brand, Ovi in Finnish is "door" meaning, the service as a person's life BaiBao junction, users can easily access by Ovi their existing social networks and content.

Function introduction

Ovi can not only support users easy access to the existing social networks, community and all the content, more personal life "BaiBao collect". Its launch let nokia "science and technology humanist" commitment to the next level. Ovi provides the user with a open environment, in here, the user can access their existing online community, subscription information and all the content, and can according to their interests, the definitions and shape their own unique Ovi experience.

Diving in how to prevent cervical spine injury

Fitness is a kind of sports, especially one that includes unarmed or use instrument gymnastics, gymnastics can enhance strength, toughness, increase stamina and improve coordination, strengthen body parts of control ability, so as to keep fit, fitness, is to have the effect after a period of exercise, can get recognized.

Diving is a popular sports activities. However, beginners divers if diving when does not pay attention to safety, very easy occurrence cervical spine injury accident, thereby causing serious consequences, and even cause death.

Cervical spine injury mainly refers to the cervical fractures and dislocations, subluxation of local with five and six, cervical spine fracture dislocation and see more, when fracture often concurrent spinal cord injury, clinical symptom for limbs. 

Don't walk machine greatly fitness equipment

Walking machine is fitness equipment is the most common through training, can enhance heart lungs function, to a certain extent, improve power, enhance physical coordination lower extremities. Exercise, hands clench his chest handle, bipod, in two pedals on stand, upper body straight and then like walking, naturally alternately to and fro two legs.

Legs don't full extension, but slightly bent, make the leg muscles get better exercise. Generally, the proposal in old people take exercise every week 3-5 times, every 20 minutes, and combined with the other strength training instrument flexibility and training equipment, can have very good fitness results.

Different from the gym in the spacewalk machine, community walking machine is simple, practical, and but resistance is very light, during exercise, many people will swing range is larger. This is not true, because range is too big a thigh muscle strain, easy might also because control fine balance and fell off. The right way is to normal range of large stride walk is limited to exercise. Others like two legs simultaneously to and fro, this is more dangerous movement, it is easy to make body lose focus. Once falling equipment, damage the bigger, light is bruised, heavy then likely because precept from a fall in the head injuries. In addition, spine have illness, with traumatic osteoarthritis people shall not use this equipment exercise.