A-M baby

Task/Factorial/Python/factorial-1.py

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+import math
+math.factorial(n)

Task/Factorial/Python/factorial-2.py

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+def factorial(n):
+    result = 1
+    for i in range(1, n+1):
+        result *= i
+    return result

Task/Factorial/Python/factorial-3.py

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+from operator import mul
+
+def factorial(n):
+    return reduce(mul, xrange(1,n+1), 1)

Task/Factorial/Python/factorial-4.py

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+>>> for i in range(6):
+    print i, factorial(i)
+
+0 1
+1 1
+2 2
+3 6
+4 24
+5 120
+>>>

Task/Factorial/Python/factorial-5.py

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+from cmath import *
+
+# Coefficients used by the GNU Scientific Library
+g = 7
+p = [0.99999999999980993, 676.5203681218851, -1259.1392167224028,
+     771.32342877765313, -176.61502916214059, 12.507343278686905,
+     -0.13857109526572012, 9.9843695780195716e-6, 1.5056327351493116e-7]
+
+def gamma(z):
+  z = complex(z)
+  # Reflection formula
+  if z.real < 0.5:
+    return pi / (sin(pi*z)*gamma(1-z))
+  else:
+    z -= 1
+    x = p[0]
+    for i in range(1, g+2):
+      x += p[i]/(z+i)
+    t = z + g + 0.5
+    return sqrt(2*pi) * t**(z+0.5) * exp(-t) * x
+
+def factorial(n):
+  return gamma(n+1)
+
+print "factorial(-0.5)**2=",factorial(-0.5)**2
+for i in range(10):
+  print "factorial(%d)=%s"%(i,factorial(i))

Task/Factorial/Python/factorial-6.py

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+def factorial(n):
+    z=1
+    if n>1:
+        z=n*factorial(n-1)
+    return z