# cpython-withatomic / Doc / libwhrandom.tex

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  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 \section{Standard Module \sectcode{whrandom}} \label{module-whrandom} \stmodindex{whrandom} This module implements a Wichmann-Hill pseudo-random number generator class that is also named \code{whrandom}. Instances of the \code{whrandom} class have the following methods: \renewcommand{\indexsubitem}{(in module whrandom)} \begin{funcdesc}{choice}{seq} Chooses a random element from the non-empty sequence \var{seq} and returns it. \end{funcdesc} \begin{funcdesc}{randint}{a\, b} Returns a random integer \var{N} such that \code{\var{a}<=\var{N}<=\var{b}}. \end{funcdesc} \begin{funcdesc}{random}{} Returns the next random floating point number in the range [0.0 ... 1.0). \end{funcdesc} \begin{funcdesc}{seed}{x\, y\, z} Initializes the random number generator from the integers \var{x}, \var{y} and \var{z}. When the module is first imported, the random number is initialized using values derived from the current time. \end{funcdesc} \begin{funcdesc}{uniform}{a\, b} Returns a random real number \var{N} such that \code{\var{a}<=\var{N}<\var{b}}. \end{funcdesc} When imported, the \code{whrandom} module also creates an instance of the \code{whrandom} class, and makes the methods of that instance available at the module level. Therefore one can write either \code{N = whrandom.random()} or: \bcode\begin{verbatim} generator = whrandom.whrandom() N = generator.random() \end{verbatim}\ecode % \begin{seealso} \seemodule{random}{generators for various random distributions} \seetext{Wichmann, B. A. \& Hill, I. D., Algorithm AS 183: An efficient and portable pseudo-random number generator'', Applied Statistics 31 (1982) 188-190} \end{seealso} 
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