[Tutor] operator, mult
col speed
ajarncolin at gmail.com
Wed Jan 28 02:07:19 CET 2009
Hello there,
I got the following function while googling:
def totient(n):
"""calculate Euler's totient function.
If [[p_0,m_0], [p_1,m_1], ... ] is a prime factorization of 'n',
then the totient function phi(n) is given by:
(p_0 - 1)*p_0**(m_0-1) * (p_1 - 1)*p_1**(m_1-1) * ...
>>> phi(1)
1
>>> phi(10)
4
"""
from operator import mult
if n == 1: return 1
return reduce(mult, [(p-1) * p**(m-1) for p,m in prime_factors_mult(n)])
I already have the "prime_factors" function. The problem is that I cannot
find "mult". I tried using "mul" which is in "operator" but that is
obviously not the same thing.
Could there be a similar thing somewhere other than "operator"?
Thanks a lot
Colin
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