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Error in calling a custom function from sage

I used this guide to add module containing some utility to the sage.

My module ( looks like this:

def perm(n, r):
    return factorial(n)/factorial(n-r)

def comb(n, r):
    return perm(n, r)/factorial(r)

To import the module I use the following import statement:

sage: from myfunc import perm

So far so good.

When I call the perm() or comb() function. I get the following error:

 1 def perm(n, r):
 ----> 2     return factorial(n)/factorial(n-r)
 4 def comb(n, r):
 5     return perm(n, r)/factorial(r)

NameError: name 'factorial' is not defined