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python Programming Glossary: factorialWhat is memoization and how can I use it in Python? http://stackoverflow.com/questions/1988804/what-is-memoization-and-how-can-i-use-it-in-python To Algorithms 3e . A simple example for computing factorials using memoization in Python would be something like this factorial_memo.. using memoization in Python would be something like this factorial_memo def factorial k if k 2 return 1 if not k in factorial_memo.. in Python would be something like this factorial_memo def factorial k if k 2 return 1 if not k in factorial_memo factorial_memo..
counting combinations and permutations efficiently http://stackoverflow.com/questions/2096573/counting-combinations-and-permutations-efficiently like to find a better algorithm that avoids the call to factorial r which is an unnecessarily large intermediate result. Without.. the last doctest takes too long trying to calculate factorial 99000 . Can anyone suggest a more efficient way to count combinations.. more efficient way to count combinations from math import factorial def product iterable prod 1 for n in iterable prod n return..
Python: Random is barely random at all? http://stackoverflow.com/questions/2145510/python-random-is-barely-random-at-all pair occurring. # birthday.py # from math import log10 factorial PV 4500 # Number of possible values SS 100 # Sample size # These.. starts using bignums behind the scenes. # numerator factorial PV denominator PV SS factorial PV SS # Now we need to get from.. the scenes. # numerator factorial PV denominator PV SS factorial PV SS # Now we need to get from bignums to floats without intermediate..
How can I build a recursive function in python? [closed] http://stackoverflow.com/questions/479343/how-can-i-build-a-recursive-function-in-python is a simple example of a recursive function to compute the factorial function def factorial n if n 0 return 1 else return n factorial.. a recursive function to compute the factorial function def factorial n if n 0 return 1 else return n factorial n 1 The two key elements.. function def factorial n if n 0 return 1 else return n factorial n 1 The two key elements of a recursive algorithm are The termination..
Can a lambda function call itself recursively in Python? http://stackoverflow.com/questions/481692/can-a-lambda-function-call-itself-recursively-in-python the ideas from the other answers I was able to wedge the factorial function into a single unnamed lambda map lambda n lambda f..
IndentationError: unindent does not match any outer indentation level http://stackoverflow.com/questions/492387/indentationerror-unindent-does-not-match-any-outer-indentation-level indentation level import sys def Factorial n # Return factorial result 0 for i in range 1 n result result i print factorial.. result 0 for i in range 1 n result result i print factorial is result return result Why python indentation share improve.. a few spaces. Try this import sys def Factorial n # return factorial result 1 for i in range 1 n result result i print factorial..
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