A Whirlwind Tour of Python

... example Python has a special value called None It is generally used to represent a null value Variable names are case sensitive Variables can change type, simply by assigning them a new value of a ... and spaces Python treats tabs as spaces If you use an editor that treats tabs as anything but spaces, and you mix spaces and tabs, you may see indentations in your editor’s display...

Ngày tải lên: 18/05/2017, 23:03

... demonstrated the declaration and use of managed aggregate types, including ref classes, value classes, managed arrays, enum classes, and interface classes In the next section, you’ll learn about features ... create the array, specifying the type and the number of elements in the constructor argument instead of using square brackets in the declaration The managed array...

Ngày tải lên: 05/10/2013, 08:20

... CHAPTER 21 ■ A BRIEF TOUR OF THE X DISPLAY ENVIRONMENT Some common X servers are XFree86 and X. org on Linux and other UNIX-related operating systems, and Exceed and Cygwin /X on Windows There are ... on a laptop and the X application (i.e., client) that you want to run is located on a remote system You can arrange to have the application output display on the...

Ngày tải lên: 05/10/2013, 08:51

... same condition on any acquirer British Library Cataloguing in Publication Data Data available Library of Congress Cataloguing in Publication Data Data available Typeset in 11 /13 pt Dante by SPI Publisher ... making an exactly equal amount of antimatter at the same time And there’s the problem If the Universe made equal amounts of matter and antimatter, it should all have disappeared...

Ngày tải lên: 08/08/2014, 01:20

... Sun’s, and nowadays they are called microquasars The black hole idea was thus available, ready made, for explaining the quasars and active galaxies with far more massive pits of gravity I Verification ... There are also seasonal differences in the uptake and release of the gas by seawater The asymmetry results in a yearly wave in the graph of global carbon dioxide, as measured at Maun...

Ngày tải lên: 08/08/2014, 01:20

... Pangaea of 200 million years ago, and Pannotia of 800 million years ago, there are rumours of previous supercontinents 1100, 1500 and 230 0 million years ago Rodinia, Amazonia and Kenora are names ... dominated the meeting As a polymath geographer, and later founder of the Climate Research Unit at East Anglia, he had a strong claim to be called the father of modern climate sc...

Ngày tải lên: 08/08/2014, 01:20

... north-westward on the Pacific Plate, along the San Andreas Fault and a swarm of related faults Prediction was intended to mean not just a general declaration that a region is earthquake prone, but a practical ... knowledge of actual man-made earthquakes that happened by accident An underground H-bomb test in Nevada in 1968 caused many small earthquakes over a period of three w...

Ngày tải lên: 08/08/2014, 01:20

... stars of the Milky Way Galaxy itself, and at nearby galaxies Billions of years from now, the Magellanic Clouds and the Andromeda Galaxy may all crash into us If so, the spirals of the Milky Way ... and Latvian was not always easy to find And hopes that machine translation might rescue fast-disappearing minor languages were also disappointed Even major languages and their cultural payloa...

Ngày tải lên: 08/08/2014, 01:20

... Berkeley announced another walker, around 5.5 million years old, found in Ethiopia He called it Ardipithecus ramidus kadabba, where kadabba meant ‘basal family ancestor’ in the Afar language of the ... the Peruvian side of Titicaca In other settings, on the coastal plains of Colombia and Ecuador, and in the old Maya heartlands of Central America, farming techniques adapted to lowland...

Ngày tải lên: 08/08/2014, 01:20

... southern England Meanwhile, Kielan-Jaworowska had become a leading advocate of the idea that the Mongolian animals represented the early evolution of placental mammals, the kind of creatures that include ... geography of the Pangaean break-up The oldest group of placental mammals, in this analysis, is called the Afrotherians Originating in Africa, it now includes aardvarks and ele...

Ngày tải lên: 08/08/2014, 01:20

... like a kite, with a flat, roughly square head made mainly of carbon and nitrogen atoms, and a long wiggly tail of carbon atoms attached by an acetic acid molecule In the centre of the head is a ... per cent in Africa and Asia Plant diseases can also devastate species in the wild, as when the bark-ravaging fungus Cryphonectria parasitica crippled every last stand of native Amer...

Ngày tải lên: 08/08/2014, 01:20