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Python aims to be simple and consistent in the design of its syntax, encapsulated in the mantra "There should be one— and preferably only one —obvious way to do it", from the Zen of Python. [2] This mantra is deliberately opposed to the Perl and Ruby mantra, "there's more than one way to do it".
Python does not support tail call optimization or first-class continuations, and, according to Van Rossum, it never will. [99] [100] However, better support for coroutine-like functionality is provided by extending Python's generators. [101] Before 2.5, generators were lazy iterators; data was passed unidirectionally out of the generator. From ...
A standard roulette wheel contains the number 0 as well as 1-36. It appears in green, so is classed as neither a "red" nor "black" number for betting purposes. The card game Uno has number cards running from 0 to 9 along with special cards, within each coloured suit. The Four Essential Freedoms of Free Software are numbered starting from zero ...
In Python, if a name is intended to be "private", it is prefixed by one or two underscores. Private variables are enforced in Python only by convention. Names can also be suffixed with an underscore to prevent conflict with Python keywords. Prefixing with double underscores changes behaviour in classes with regard to name mangling.
Unix or Linux scripts may start with a shebang ("#!", 23 21) followed by the path to an interpreter, if the interpreter is likely to be different from the one from which the script was invoked. ELF executables start with the byte 7F followed by "ELF" (7F 45 4C 46). PostScript files and programs start with "%!" (25 21).
The Unicode Standard permits the BOM in UTF-8, [4] but does not require or recommend its use. [5] UTF-8 always has the same byte order, [6] so its only use in UTF-8 is to signal at the start that the text stream is encoded in UTF-8, or that it was converted to UTF-8 from a stream that contained an optional BOM. The standard also does not ...
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Some variants of BASIC also support a computed GOTO in the sense used in GNU C, i.e. in which the target can be any line number, not just one from a list. For example, in MTS BASIC one could write GOTO i*1000 to jump to the line numbered 1000 times the value of a variable i (which might represent a selected menu option, for example).