http://code.activestate.com/recipes/tags/numbers/top/2017-03-12T23:10:48-07:00ActiveState Code Recipes2016-12-13T05:05:52-08:00Brandon Martinhttp://code.activestate.com/recipes/users/4194238/http://code.activestate.com/recipes/580731-roman-numeral-converter/

<p style="color: grey"> Python recipe 580731 by <a href="/recipes/users/4194238/">Brandon Martin</a> (<a href="/recipes/tags/math/">math</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/numerals/">numerals</a>, <a href="/recipes/tags/roman/">roman</a>). </p> <p>Provides two functions: romanToNumber - Converts a string of Roman Numerals (I,V,X,L,C,D,M) into an integer. (ignores formatting, will return best guess if improperly formatted) numberToRoman - Converts an integer into a string of Roman Numerals</p>

2011-11-05T23:42:37-07:00Alexander James Wallarhttp://code.activestate.com/recipes/users/4179768/http://code.activestate.com/recipes/577935-primelist/

<p style="color: grey"> Python recipe 577935 by <a href="/recipes/users/4179768/">Alexander James Wallar</a> (<a href="/recipes/tags/list/">list</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/prime/">prime</a>, <a href="/recipes/tags/primelist/">primelist</a>, <a href="/recipes/tags/primes/">primes</a>, <a href="/recipes/tags/theory/">theory</a>). Revision 3. </p> <p>This module returns all the prime numbers strictly less than n. For this code to print out all of the primes n inclusive, in the range, n+1 must be substituted for n.</p>

2010-07-27T01:57:20-07:00robert.william.hankshttp://code.activestate.com/recipes/users/4174481/http://code.activestate.com/recipes/577331-fastest-way-to-list-all-primes-below-n-in-python/

<p style="color: grey"> Python recipe 577331 by <a href="/recipes/users/4174481/">robert.william.hanks</a> (<a href="/recipes/tags/fast/">fast</a>, <a href="/recipes/tags/fastest/">fastest</a>, <a href="/recipes/tags/math/">math</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/numpy/">numpy</a>, <a href="/recipes/tags/primes/">primes</a>, <a href="/recipes/tags/python/">python</a>). Revision 6. </p> <p>I was looking for a fast way to list all primes below n, so far i came up to this with the numpy solution the fastest. It does primes up to 10e6 in 15ms in my old machine, and it is capable of reaching 10e9. </p>

2010-07-20T04:05:00-07:00Alejandro Peraltahttp://code.activestate.com/recipes/users/4174433/http://code.activestate.com/recipes/577318-infinite-list-of-primes-yay/

<p style="color: grey"> Python recipe 577318 by <a href="/recipes/users/4174433/">Alejandro Peralta</a> (<a href="/recipes/tags/iterators/">iterators</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/primes/">primes</a>). </p> <p>It's an iterator that returns prime numbers. </p> <p>Got the idea from here: <a href="http://www.cs.hmc.edu/%7Eoneill/papers/Sieve-JFP.pdf" rel="nofollow">www.cs.hmc.edu/~oneill/papers/Sieve-JFP.pdf</a></p>

2010-07-18T11:20:19-07:00st0lehttp://code.activestate.com/recipes/users/4174421/http://code.activestate.com/recipes/577313-romannumeral-to-integers-viceversa/

<p style="color: grey"> Java recipe 577313 by <a href="/recipes/users/4174421/">st0le</a> (<a href="/recipes/tags/conversions/">conversions</a>, <a href="/recipes/tags/java/">java</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/roman/">roman</a>). </p> <p>Converts Roman Symbols to Integers and back.</p>

2017-03-12T23:10:48-07:00Vasudev Ramhttp://code.activestate.com/recipes/users/4173351/http://code.activestate.com/recipes/580762-number-of-bits-needed-to-store-an-integer-and-its-/

<p style="color: grey"> Python recipe 580762 by <a href="/recipes/users/4173351/">Vasudev Ram</a> (<a href="/recipes/tags/binary/">binary</a>, <a href="/recipes/tags/formats/">formats</a>, <a href="/recipes/tags/integers/">integers</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/representation/">representation</a>, <a href="/recipes/tags/type/">type</a>). </p> <p>This recipe shows how to find, via Python code, the number of bits needed to store an integer, and how to generate its binary representation. It does this for integers from 0 to 256.</p> <p>More details and full output here:</p> <p><a href="https://jugad2.blogspot.in/2017/03/find-number-of-bits-needed-to-store.html" rel="nofollow">https://jugad2.blogspot.in/2017/03/find-number-of-bits-needed-to-store.html</a></p>

2016-07-14T21:08:01-07:00Chathura Gunasekarahttp://code.activestate.com/recipes/users/4194443/http://code.activestate.com/recipes/580689-convert-spelled-out-integers-eg-three-thousand-two/

<p style="color: grey"> Python recipe 580689 by <a href="/recipes/users/4194443/">Chathura Gunasekara</a> (<a href="/recipes/tags/integers/">integers</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/python/">python</a>, <a href="/recipes/tags/strings/">strings</a>). </p> <p>-Provides an isNumber function that can test if a floating point number is a number -str_to_int can convert a spelled out integer (e.g. 'one hundred thirty five') to its numeric form (e.g. 135) -int_to_str can convert an integer into its spelled out form.</p>

2016-06-09T20:35:26-07:00Brandon Martinhttp://code.activestate.com/recipes/users/4194238/http://code.activestate.com/recipes/580679-convert-spelled-out-integers-eg-three-thousand-two/

<p style="color: grey"> Python recipe 580679 by <a href="/recipes/users/4194238/">Brandon Martin</a> (<a href="/recipes/tags/integers/">integers</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/python/">python</a>, <a href="/recipes/tags/strings/">strings</a>). </p> <p>-Provides an isNumber function that can test if a floating point number is a number -str_to_int can convert a spelled out integer (e.g. 'one hundred thirty five') to its numeric form (e.g. 135) -int_to_str can convert an integer into its spelled out form.</p>

2015-08-04T20:08:29-07:00Vasudev Ramhttp://code.activestate.com/recipes/users/4173351/http://code.activestate.com/recipes/579093-converting-numeric-strings-to-integers/

<p style="color: grey"> Python recipe 579093 by <a href="/recipes/users/4173351/">Vasudev Ram</a> (<a href="/recipes/tags/formats/">formats</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/numerical/">numerical</a>, <a href="/recipes/tags/python/">python</a>, <a href="/recipes/tags/python2/">python2</a>, <a href="/recipes/tags/representation/">representation</a>). </p> <p>This recipe shows how to convert numeric strings into integers, i.e. it emulates the Python int() function - partially. It does not handle negative numbers, floating point numbers, or numbers in other bases than decimal. It is only meant as a simple demo of the steps by which a string containing an integer value, is converted into an actual integer, in Python (and similarly, in other languages).</p>

2011-11-09T19:38:14-08:00Alexander James Wallarhttp://code.activestate.com/recipes/users/4179768/http://code.activestate.com/recipes/577944-random-binary-list/

<p style="color: grey"> Python recipe 577944 by <a href="/recipes/users/4179768/">Alexander James Wallar</a> (<a href="/recipes/tags/base/">base</a>, <a href="/recipes/tags/binary/">binary</a>, <a href="/recipes/tags/list/">list</a>, <a href="/recipes/tags/math/">math</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/python/">python</a>, <a href="/recipes/tags/random/">random</a>, <a href="/recipes/tags/random_binary_list/">random_binary_list</a>). </p> <p>This recipe returns a list of size n such that the contents of the returned list are random 0s and 1s. It returns a random binary list of size n.</p>

2012-11-28T19:41:07-08:00khttp://code.activestate.com/recipes/users/4168241/http://code.activestate.com/recipes/576577-num2words/

<p style="color: grey"> Python recipe 576577 by <a href="/recipes/users/4168241/">k</a> (<a href="/recipes/tags/num2words/">num2words</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/numerals/">numerals</a>). Revision 3. </p> <p>A simple python script that translates an integer to plain English.</p>

2008-07-29T07:06:58-07:00Pádraig Bradyhttp://code.activestate.com/recipes/users/1890175/http://code.activestate.com/recipes/576385-format-a-number-for-human-consumption/

<p style="color: grey"> Python recipe 576385 by <a href="/recipes/users/1890175/">Pádraig Brady</a> (<a href="/recipes/tags/format/">format</a>, <a href="/recipes/tags/iec/">iec</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/si/">si</a>, <a href="/recipes/tags/thousands/">thousands</a>). </p> <p>convert a number to a string representation that is more easily parsed by humans. It supports inserting thousands separators and converting to IEC or SI units.</p>

2016-02-18T19:34:17-08:00Lance Spencehttp://code.activestate.com/recipes/users/4193647/http://code.activestate.com/recipes/580613-generate-a-set-of-random-integers/

<p style="color: grey"> Python recipe 580613 by <a href="/recipes/users/4193647/">Lance Spence</a> (<a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/random/">random</a>). </p> <p>This is just a short and simple script that generates a set of random numbers. You enter how many random numbers you want and the program will generate them.</p> <p>The num is multiplied by 10 in the upper limit within the for loop to give you larger generated integers. Adjust it as needed.</p>

2013-07-15T14:34:07-07:00Captain DeadBoneshttp://code.activestate.com/recipes/users/4184772/http://code.activestate.com/recipes/578607-kth-compsite-number/

<p style="color: grey"> Python recipe 578607 by <a href="/recipes/users/4184772/">Captain DeadBones</a> (<a href="/recipes/tags/kth/">kth</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/python/">python</a>). </p> <p>Found this Interview question. Here is my solution to it.</p> <p>Assume f(x,y,z) = a^x * b^y * c^z</p> <p>The x, y and z are integers larger than or equal to zero. Find the kth number in the series this function produces.</p> <p>Check out my blog <a href="http://thelivingpearl.com/">Captain DeadBones Chronicles</a></p>

2012-12-06T13:44:42-08:00Stephen Chappellhttp://code.activestate.com/recipes/users/2608421/http://code.activestate.com/recipes/578365-averaging-literal-numbers/

<p style="color: grey"> Python recipe 578365 by <a href="/recipes/users/2608421/">Stephen Chappell</a> (<a href="/recipes/tags/algorithms/">algorithms</a>, <a href="/recipes/tags/demonstration/">demonstration</a>, <a href="/recipes/tags/numbers/">numbers</a>). </p> <p>One program that a teacher may assign to beginning programming students would be to take a list of numbers and average them together. This recipe does just that and is designed to be easy to read and follow, showing what is possible with a few lines of Python.</p>

2011-11-21T19:58:14-08:00Alexander James Wallarhttp://code.activestate.com/recipes/users/4179768/http://code.activestate.com/recipes/577939-base-expansionconversion-algorithm-python/

<p style="color: grey"> Python recipe 577939 by <a href="/recipes/users/4179768/">Alexander James Wallar</a> (<a href="/recipes/tags/base/">base</a>, <a href="/recipes/tags/base16/">base16</a>, <a href="/recipes/tags/base2/">base2</a>, <a href="/recipes/tags/base_conversion/">base_conversion</a>, <a href="/recipes/tags/base_expansion/">base_expansion</a>, <a href="/recipes/tags/conversion/">conversion</a>, <a href="/recipes/tags/lists/">lists</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/number_theory/">number_theory</a>, <a href="/recipes/tags/python/">python</a>). Revision 3. </p> <p>This algorithm converts a base c number into a base b number. Parameters c and b are arbitrary are not constrained by any bounds. The input n is a list and the output is a list.</p>

2010-05-19T17:02:28-07:00AJ. Mayorgahttp://code.activestate.com/recipes/users/4173476/http://code.activestate.com/recipes/577229-prime-perfect-and-fibonacci-number-widget-class/

<p style="color: grey"> Python recipe 577229 by <a href="/recipes/users/4173476/">AJ. Mayorga</a> (<a href="/recipes/tags/cryptography/">cryptography</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/prime/">prime</a>, <a href="/recipes/tags/primes/">primes</a>). Revision 2. </p> <p>A class Ive had in my snippets for awhile that can generate prime, perfect and fibonacci sequences as well as check whether or not a supplied value is any of them.</p>

2009-11-04T06:52:06-08:00Maxime Fontenierhttp://code.activestate.com/recipes/users/4172150/http://code.activestate.com/recipes/576948-simple-primes-generator/

<p style="color: grey"> Python recipe 576948 by <a href="/recipes/users/4172150/">Maxime Fontenier</a> (<a href="/recipes/tags/any/">any</a>, <a href="/recipes/tags/generator/">generator</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/primes/">primes</a>). </p> <p>Simple prime generator. </p> <p>I write it as a sample usage of the any function.</p>

2010-02-04T12:54:27-08:00Serdar Tumgorenhttp://code.activestate.com/recipes/users/4171495/http://code.activestate.com/recipes/576888-format-a-number-as-an-ordinal/

<p style="color: grey"> Python recipe 576888 by <a href="/recipes/users/4171495/">Serdar Tumgoren</a> (<a href="/recipes/tags/number/">number</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/numerals/">numerals</a>, <a href="/recipes/tags/ordinals/">ordinals</a>). Revision 10. </p> <p>This function converts 0 and <em>positive</em> integers (or their string representations) to their ordinal values. For example, it would convert 0 to "0th", 1 to "1st", 2 to "2nd", 3 to "3rd" and so on.</p>

2010-02-11T22:19:41-08:00Matevz Leskohttp://code.activestate.com/recipes/users/4173032/http://code.activestate.com/recipes/577054-comma-float-to-float/

<p style="color: grey"> Python recipe 577054 by <a href="/recipes/users/4173032/">Matevz Lesko</a> (<a href="/recipes/tags/comma/">comma</a>, <a href="/recipes/tags/float/">float</a>, <a href="/recipes/tags/numbers/">numbers</a>, <a href="/recipes/tags/string/">string</a>). Revision 2. </p> <p>Convert comma separated floating point number (12,3456) to float.</p>