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======== Glossary ======== .. glossary:: "Everything but the kitchen sink" An English idiom meaning to include nearly everything that you can think of. API version Version that is meant for computer consumption. This version is parsable and comparable by computers. It contains information about a library's API so that computer software can decide whether it works with the software. ASCII A character encoding that maps numbers to characters essential to American English. It maps 128 characters using 7bits. .. seealso:: http://en.wikipedia.org/wiki/ASCII ASCII compatible An encoding in which the particular byte that maps to a character in the :term:`ASCII` character set is only used to map to that character. This excludes EBDIC based encodings and many multi-byte fixed and variable width encodings since they reuse the bytes that make up the :term:`ASCII` encoding for other purposes. :term:`UTF-8` is notable as a variable width encoding that is :term:`ASCII` compatible. .. seealso:: http://en.wikipedia.org/wiki/Variable-width_encoding For another explanation of various ways bytes are mapped to characters in a possibly incompatible manner. code points :term:`code point` code point A number that maps to a particular abstract character. Code points make it so that we have a number pointing to a character without worrying about implementation details of how those numbers are stored for the computer to read. Encodings define how the code points map to particular sequences of bytes on disk and in memory. control characters :term:`control character` control character The set of characters in unicode that are used, not to display glyphs on the screen, but to tell the display in program to do something. .. seealso:: http://en.wikipedia.org/wiki/Control_character grapheme characters or pieces of characters that you might write on a page to make words, sentences, or other pieces of text. .. seealso:: http://en.wikipedia.org/wiki/Grapheme I18N I18N is an abbreviation for internationalization. It's often used to signify the need to translate words, number and date formats, and other pieces of data in a computer program so that it will work well for people who speak another language than yourself. message catalogs :term:`message catalog` message catalog Message catalogs contain translations for user-visible strings that are present in your code. Normally, you need to mark the strings to be translated by wrapping them in one of several :mod:`gettext` functions. The function serves two purposes: 1. It allows automated tools to find which strings are supposed to be extracted for translation. 2. The functions perform the translation when the program is running. .. seealso:: `babel's documentation <http://babel.edgewall.org/wiki/Documentation/messages.html>`_ for one method of extracting message catalogs from source code. Murphy's Law "Anything that can go wrong, will go wrong." .. seealso:: http://en.wikipedia.org/wiki/Murphy%27s_Law release version Version that is meant for human consumption. This version is easy for a human to look at to decide how a particular version relates to other versions of the software. textual width The amount of horizontal space a character takes up on a monospaced screen. The units are number of character cells or columns that it takes the place of. UTF-8 A character encoding that maps all unicode :term:`code points` to a sequence of bytes. It is compatible with :term:`ASCII`. It uses a variable number of bytes to encode all of unicode. ASCII characters take one byte. Characters from other parts of unicode take two to four bytes. It is widespread as an encoding on the internet and in Linux.