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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 3.0, released in 2008, was a major revision not completely backward-compatible with earlier versions. Python 2.7.18, released in 2020, was the last release of Python 2. [37] Python consistently ranks as one of the most popular programming languages, and has gained widespread use in the machine learning community. [38] [39] [40] [41]
Python 2.6 was released to coincide with Python 3.0, and included some features from that release, as well as a "warnings" mode that highlighted the use of features that were removed in Python 3.0. [ 28 ] [ 10 ] Similarly, Python 2.7 coincided with and included features from Python 3.1, [ 29 ] which was released on June 26, 2009.
Further, regarding the long-term plans, and as the project missed the Python 2.7 release, a Python Enhancement Proposal (PEP) [8] was accepted, which proposed a merge of Unladen Swallow into a special py3k-jit branch of Python's official repository.
A version of Python with keywords and built-in identifiers all translated to Chinese. Easy Programming Language: A Chinese rapid application development language. Wenyan An esoteric language that closely follows the grammar and sentence structure of Classical Chinese; it compiles to JavaScript and Python (with C, etc. forthcoming).
The default name resolution rules can be overridden with the global or nonlocal (in Python 3) keywords. In the below code, the global x declaration in g means that x resolves to the global variable. It thus can be accessed (as it has already been defined), and assignment assigns to the global variable, rather than declaring a new local variable.
A programming language is a set of keywords, symbols, identifiers, and rules by which programmers can communicate instructions to the computer. [41] They follow a set of rules called a syntax. [41] Keywords are reserved words to form declarations and statements. Symbols are characters to form operations, assignments, control flow, and delimiters.
The fact that these keywords were subjectively specified was leading to spamdexing, which drove many search engines to adopt full-text indexing technologies in the 1990s. Search engine designers and companies could only place so many 'marketing keywords' into the content of a webpage before draining it of all interesting and useful information.