I have not written python codes nor run any. I saw this
code posted and decided to try it. It fails. I read the
tutorial and the entry for the built in function sum,
but still do not see the problem. The code was cut and
paste. Please help. Thanks.
_________________________BEGIN_CODE_________________________
#!/usr/bin/python
ps = [none, 2,3,5,7,11,13,17,19,23,29]
def phi(x, a):
return x - sum(phi(x // ps[i+1], i) for i in range(a))
def pi(n):
from math import sqrt
if n <= 1:
return 0
a = pi(int(sqrt(n)))
return phi(n, a) + a - 1
__________________________END_CODE__________________________
Here is the result of running it:
File "/Users/mdp/source/prime_counter_python", line 6
return x - sum(phi(x // ps[i+1], i) for i in range(a))
^
SyntaxError: invalid syntax
Here are some lines from python -v:
Python 2.3 (#1, Sep 13 2003, 00:49:11)
[GCC 3.3 20030304 (Apple Computer, Inc. build 1495)] on darwin
Type "help", "copyright", "credits" or "license" for more information
--
Michael Press
--
http://mail.python.org/mailman/listinfo/python-list
