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Python sets are very much like mathematical sets, and support operations like set intersection and union. Python also features a frozenset class for immutable sets, see Collection types. Dictionaries (class dict) are mutable mappings tying keys and corresponding values. Python has special syntax to create dictionaries ({key: value})
A Unicode character is assigned a unique Name (na). [1] The name is composed of uppercase letters A–Z, digits 0–9, hyphen-minus and space.Some sequences are excluded: names beginning with a space or hyphen, names ending with a space or hyphen, repeated spaces or hyphens, and space after hyphen are not allowed.
The reserved code points (the "holes") in the alphabetic ranges up to U+1D551 duplicate characters in the Letterlike Symbols block. In order, these are ℎ / ℬ ℰ ℱ ℋ ℐ ℒ ℳ ℛ / ℯ ℊ ℴ / ℭ ℌ ℑ ℜ ℨ / ℂ ℍ ℕ ℙ ℚ ℝ ℤ.
In HTML and XML, a numeric character reference refers to a character by its Universal Character Set/Unicode code point, and uses the format: &#xhhhh;. or &#nnnn; where the x must be lowercase in XML documents, hhhh is the code point in hexadecimal form, and nnnn is the code point in decimal form.
First Japanese electronic character set ECMA-48: 1972 7 bits Terminal text manipulation and colors ISO/IEC 8859: 1987 8 bits International codes ISO/IEC 10646 1991 21 bits usable, packed into 8/16/32-bit code units Unified encoding for most of the world's writing systems. As first introduced in 1991 had 16 bits; extension to 21 bits came later.
CPS—Characters per second; CPU—Central processing unit; CQS—Command–query separation; CQRS—Command Query Responsibility Segregation; CR—Carriage return; CRAN—Comprehensive R Archive Network; CRC—Cyclic redundancy check; CRLF—Carriage return line feed; CRM—Customer Relationship Management; CRS—Computer Reservations System ...
The following is a Unicode collation algorithm list of Greek characters and those Greek-derived characters that are sorted alongside them. [2] [3] [4]Most of the characters of the blocks listed above are included, except for the Ancient Greek Numbers, Ancient Symbols and Ancient Greek Musical Notation.
The two rightmost columns indicate which irreducible representations describe the symmetry transformations of the three Cartesian coordinates (x, y and z), rotations about those three coordinates (R x, R y and R z), and functions of the quadratic terms of the coordinates(x 2, y 2, z 2, xy, xz, and yz).