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factorial.py
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factorial.py
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"""Module for estimation of factorial (Homework #1)
Note: this is just a skeleton for you to work with. But it already
has some "bugs" you need to catch and fix.
"""
from nose.tools import assert_equal
def factorial_recursive(n):
# TODO Define your logic for factorial here
if n == 1:
return 1
else:
return n * factorial_recursive(n - 1)
pass # does nothing
def factorial(n):
f = 1
while n > 1:
f = f*n
n -= 1
return f
def test_factorial():
assert_equal(factorial_recursive(1), 1)
# TODO: add more
assert_equal(factorial_recursive(2), 2)
assert_equal(factorial_recursive(6), 720)
assert_equal(factorial(1), 1)
# TODO: add more
assert_equal(factorial(2), 2)
assert_equal(factorial(6), 720)
if __name__ == '__main__':
# This is a way to determine either file was "executed", so if it was
# imported (by e.g. nose) as a library, we should not run code
# below
nconditions = raw_input("Please enter number of conditions: ")
norders = factorial_recursive(int(nconditions))
print("Number of possible trial orders: " + str(norders))
import time
start_time = time.clock()
factorial(6)
recursive_running_time = time.clock() - start_time
print "running non-recursive factorial is ", \
recursive_running_time, "seconds"
start_time = time.clock()
factorial_recursive(6)
non_recursive_running_time = time.clock() - start_time
print "running recursive factorial is ", \
non_recursive_running_time, "seconds"
print "time difference between running recursive and non_recursive " \
"factorial function is ", \
recursive_running_time - non_recursive_running_time