1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
#!/usr/bin/python
#
# A variant of cyclotomic.py which uses try/except to look for
# dictionary keys.
#
# A word of advice from Fredrik Lundh <Fredrik_Lundh@ivab.se>:
#
# Python keeps a reference to the last traceback object in
# sys.exc_traceback, which in turn includes references to items on the
# run-time stack, etc. This means that things won't be destroyed until
# the *next* exception occurs.
#
# Thus, we must clear sys.exc_traceback before calling MnAllocStats()
# if we want the real statistics.
from saml1 import *
import sys
class CyclotomicClass:
def __init__(self, literal):
self.dict = {}
self.X = literal
def __getitem__(self, number):
try:
# Already computed?
return self.dict[number]
except: pass
result = self.X.pow(number) - 1
for i in range(1,number):
if (number % i) == 0:
result = result / self[i]
# Memoize the result
self.dict[number] = result
return result
def test(n):
model = Mathnode(ST_INTEGER,'0').cast(ST_APOLY)
X = model.parse('X')
CCX = CyclotomicClass(X)
print CCX[n]
if __name__ == '__main__':
test(60)
sys.exc_traceback = None
print MnAllocStats()
|
