Python 3 --> Timing factorials.

[danbaron]

Here, in Python 3, are the times to find n!, for various values of n, on my (slow) computer.

' code -------------------------------------------------------------------------------------------

# fact.py

import time

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

print()
print("n!     seconds")
for i in range(10000,210000,10000):
  t1 = time.clock()
  f = fact(i)
  t2 = time.clock()
  print("{0:06d} {1:08.3f}".format(i,t2-t1))
print()

' output -----------------------------------------------------------------------------------------

C:\Users\root\Desktop\py>python fact.py

n!     seconds
010000 0000.189
020000 0000.796
030000 0001.931
040000 0004.924
050000 0009.093
060000 0014.278
070000 0021.162
080000 0027.877
090000 0036.518
100000 0046.368
110000 0056.992
120000 0068.359
130000 0081.301
140000 0097.560
150000 0112.566
160000 0129.895
170000 0149.381
180000 0171.193
190000 0195.403
200000 0218.713

C:\Users\root\Desktop\py>