hi to all!
after two days debugging my code, i've come to the point that the
problem was caused by an unexpected behaviour of python. or by lack of
some information about the program, of course! i've stripped down the
code to reproduce the problem:
<code>
a = {}
for x in range(10):
for y in range(10):
a[x,y] = "0"
copyOfA = a
def functionA(x,y):
print a[x,y],
copyOfA[x,y] = "*"
print a[x,y],copyOfA[x,y]
for x in range(10):
for y in range(10):
functionA(x,y)
</code>
now, in the second "for" cycle and in functionA() i only 'touch' copyOfA
(altering it). as i don't touch the variable "a", i expect it not to be
affected by any change, but copyOfA acts like a pointer to a and
altering copyOfA's values result in altering the values of "a", so the
result that i expect is:
0 0 *
0 0 *
0 0 *
0 0 *
[..]
but i get:
0 * *
0 * *
0 * *
0 * *
[..]
what's going on?
thanks in advance.
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