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Issue #2138: Add math.factorial().

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This commit is contained in:
Raymond Hettinger 2008-06-09 06:54:45 +00:00
parent dd96db63f6
commit ecbdd2e9b0
4 changed files with 71 additions and 0 deletions
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15
Lib/test/test_math.py
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@ -6,6 +6,7 @@ import unittest
import math
import os
import sys
import random
eps = 1E-05
NAN = float('nan')
@ -277,6 +278,20 @@ class MathTests(unittest.TestCase):
self.ftest('fabs(0)', math.fabs(0), 0)
self.ftest('fabs(1)', math.fabs(1), 1)
def testFactorial(self):
def fact(n):
result = 1
for i in range(1, int(n)+1):
result *= i
return result
values = range(10) + [50, 100, 500]
random.shuffle(values)
for x in range(10):
for cast in (int, long, float):
self.assertEqual(math.factorial(cast(x)), fact(x), (x, fact(x), math.factorial(x)))
self.assertRaises(ValueError, math.factorial, -1)
self.assertRaises(ValueError, math.factorial, math.pi)
def testFloor(self):
self.assertRaises(TypeError, math.floor)
# These types will be int in py3k.