Politics and the English Language by George Orwell

George Orwell: ‘Politics and the English Language’
First published: Horizon. — GB, London. — April 1946.

Reprinted:

—Shooting an Elephant: And Other Essays (Penguin Modern Classics). — 1950.

—The Orwell Reader : Fiction, Essays, and Reportage By George Orwell— 1956.

— The Collected Essays, Journalism and Letters of George Orwell. Vol.4: In Front of Your Nose, 1945-1950— 1961.

— Decline Of The English Murder And Other Essays— 1965.

— George Orwell: As I Please, 1943-1945 : The Collected Essays, Journalism & Letters (Collected Essays Journalism and Letters of George Orwell)— 1968.

http://www.orwell.ru/library/essays/politics/english/e_polit

and or python

4.6. The Peculiar Nature of and and or

 

• 4.6.1. Using the and-or Trick

In Python, and and or perform boolean logic as you would expect, but they do not return boolean values; instead, they return one of the actual values they are comparing.

This trick may seem like more trouble than it’s worth. You could, after all, accomplish the same thing with an if statement, so why go through all this fuss? Well, in many cases, you are choosing between two constant values, so you can use the simpler syntax and not worry, because you know that the a value will always be true. And even if you need to use the more complicated safe form, there are good reasons to do so. For example, there are some cases in Python where if statements are not allowed, such as in lambda functions.

 

Further Reading on the and-or Trick

• Python Cookbook discusses alternatives to the and-or trick.

SWI-Prolog

SWI-Prolog offers a comprehensive Free Software Prolog environment, licensed under the Lesser GNU Public License. Together with its graphics toolkit XPCE, its development started in 1987 and has been driven by the needs for real-world applications.