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Fork–join is the main model of parallel execution in the OpenMP framework, although OpenMP implementations may or may not support nesting of parallel sections. [6] It is also supported by the Java concurrency framework, [7] the Task Parallel Library for .NET, [8] and Intel's Threading Building Blocks (TBB). [1]
Here, the list [0..] represents , x^2>3 represents the predicate, and 2*x represents the output expression.. List comprehensions give results in a defined order (unlike the members of sets); and list comprehensions may generate the members of a list in order, rather than produce the entirety of the list thus allowing, for example, the previous Haskell definition of the members of an infinite list.
"A comma goes before 'and' or 'or' in a series of three or more: Sn, K, Na, and Li lines are invisible." Plain English Handbook, Revised Edition (McCormick-Mathers Publishing Co., 1959), § 483, p. 78 "Use commas to separate the items in a series of words, phrases, or short clauses: The farmer sold corn, hay, oats, potatoes, and wheat."
This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters. For other languages and symbol sets (especially in mathematics and science), see below
Between items in a series or listing when the items contain internal punctuation, especially parenthetic commas, where the semicolons function as the serial commas for the series or listing. The semicolon divides the items on the list from each other, to avoid having a jumble of commas with differing functions which could cause confusion for ...
var list := {0, 1} a, b := list The list will be unpacked so that 0 is assigned to a and 1 to b. Furthermore, a, b := b, a swaps the values of a and b. In languages without parallel assignment, this would have to be written to use a temporary variable var t := a a := b b := t since a := b; b := a leaves both a and b with the original value of b.
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})
In Python, a generator can be thought of as an iterator that contains a frozen stack frame. Whenever next() is called on the iterator, Python resumes the frozen frame, which executes normally until the next yield statement is reached. The generator's frame is then frozen again, and the yielded value is returned to the caller.