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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})
Python's is operator may be used to compare object identities (comparison by reference), and comparisons may be chained—for example, a <= b <= c. Python uses and, or, and not as Boolean operators. Python has a type of expression named a list comprehension, and a more general expression named a generator expression. [78]
A word list (or lexicon) is a list of a language's lexicon ... Frequency lists are a useful tool when building an electronic dictionary, ...
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.
Parse tree of Python code with inset tokenization. The syntax of textual programming languages is usually defined using a combination of regular expressions (for lexical structure) and Backus–Naur form (a metalanguage for grammatical structure) to inductively specify syntactic categories (nonterminal) and terminal symbols. [7]
Costco membership also gives shoppers access to the club's travel deals. The company revealed its largest booking in the last year was a 150-day cruise around the world.. CFO Gary Millerchip said ...
The debt ceiling returned on January 2, but Congress has several months to address it before the nation could default on its obligations. (Jemal Countess/Getty Images)
Harvest Bowl. Add a base of broth-soaked wild rice then layer with baby kale, sweet potatoes, Brussels sprouts, and chicken. Add lots of fun toppings like crunchy apples, tangy goat cheese ...