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English: PDF version of Non-Programmer's Tutorial for Python 2.6 This file was created with MediaWiki to LaTeX . The LaTeX source code is attached to the PDF file (see imprint).
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 is a high-level, general-purpose programming language. Its design philosophy emphasizes code readability with the use of significant indentation. [33] Python is dynamically type-checked and garbage-collected. It supports multiple programming paradigms, including structured (particularly procedural), object-oriented and functional ...
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For example, in Python, to print the string Hello, World! followed by a newline, one only needs to write print ("Hello, World!" In contrast, the equivalent code in C++ [ 7 ] requires the import of the input/output (I/O) software library , the manual declaration of an entry point , and the explicit instruction that the output string should be ...
Computer programming or coding is the composition of sequences of instructions, called programs, that computers can follow to perform tasks. [1] [2] It involves designing and implementing algorithms, step-by-step specifications of procedures, by writing code in one or more programming languages.
Semantics assigns computational meaning to valid strings in a programming language syntax. It is closely related to, and often crosses over with, the semantics of mathematical proofs . Semantics describes the processes a computer follows when executing a program in that specific language.
Key features include: Only five basic data types; No required variable declarations; Explicit support for top-down programming; Statement nesting is indicated by indentation, via the off-side rule; Infinite precision arithmetic, unlimited-sized lists and strings, and other features supporting orthogonality and ease of use by novices