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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})
Note that fmap, join, append and bind are well-defined, since they're applied to progressively deeper arguments at each recursive call. The list type is an additive monad, with nil as the monadic zero and append as monadic sum. Lists form a monoid under the append operation. The identity element of the monoid is the empty list, nil.
Following Lisp, other high-level programming languages which feature linked lists as primitive data structures have adopted an append. To append lists, as an operator, Haskell uses ++, OCaml uses @. Other languages use the + or ++ symbols to nondestructively concatenate a string, list, or array.
Do not put quotations in italics. Quotation marks (or block quoting) alone are sufficient and the correct ways to denote quotations. Italics should only be used if the quoted material would otherwise call for italics. Use italics within quotations to reproduce emphasis that exists in the source material or to indicate the use of non-English words.
To create a heading without using the toolbar, put text between = signs; the number of = signs on each side of the text indicates the level: ==Heading== (Level 2) ===Subheading=== (Level 3) Text can be made bold or italic using the B and I buttons on the toolbar.
Sir Paul McCartney has big plans for 2025.. On Saturday, Dec. 21, the Beatles musician, 82, answered a series of fan questions on his website, including what his New Year's resolution is — to ...
The delimiters around the tag have the same effect within the here doc as they would in a regular string literal: For example, using double quotes around the tag allows variables to be interpolated, but using single quotes doesn't, and using the tag without either behaves like double quotes. Using backticks as the delimiters around the tag runs ...
Click Download AOL Desktop Gold or Update Now. 4. Navigate to your Downloads folder and click Save. 5. Follow the installation steps listed below. Install Desktop Gold.