Python (programming language) was initially set at 2015 then postponed to 2020 out of concern that a large body of existing code could not easily be forward-ported to Python 3. In January 2017, Google announced work on a Python 2.7 to Go transcompiler to improve performance under concurrent workloads. Python is a multi-paradigm programming language. Object-oriented programming and structured programming are fully supported, and many of its features support functional programming and aspect-oriented programming (including by metaprogramming and metaobjects (magic methods)). Many other paradigms are supported via extensions, including design by contract and logic programming. Python uses dynamic typing, and a combination of
Python syntax and semantics among Python users has been removing tabs as block markers; other Python users propound removing spaces instead). Moreover, formatting routines which remove whitespace—for instance, many Internet forums—can destroy the syntax of a Python program, whereas a program in a bracketed language would merely become more difficult to read. Many popular code editors handle Python's indentation conventions seamlessly, sometimes after a configuration option is enabled. Since Python is a dynamically typed language, Python "values," not variables, carry type. This has implications for many aspects of the way the language functions. All variables in Python hold references to objects, and these references