from time import clock
n = 100
m = 5
s1 = [ ["a"] * m ] * n
t = clock()
for i in range(n):
s1[i].append("a")
print len(s1), len(s1[1]), clock() - t
The output is,
100 105 0.08333
The 105 seems wrong to me (it should be 6, no?). Interestingly enough
if I now do the inverse transformation,
t = clock()
for i in range(n):
l = len(s1[i])
del s1[i][l-1:l]
print len(s1), len(s1[1]), clock() - t
I get the output,
100 5 0.099996
which would be the correct output if the first lot of output
were correct.
However if I do the inverse transformation as,
t = clock()
for i in range(n):
s1[i] = s1[i][0:len(s1[i])-1]
print len(s1), len(s1[1]), clock() - t
I get the output,
100 104 0.116662
Is this a bug or am I missing something?
graham
--
Je suis pour le communisme
Je suis pour le socialisme
Je suis pour le capitalisme
Parce que je suis opportuniste