> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:python-
> [EMAIL PROTECTED] On Behalf Of Tobiah
> Sent: Monday, January 07, 2008 5:24 PM
> To: python-list@python.org
> Subject: 'Borg' and multiple threads.
>
> I have a class that I call Borg that starts like this:
>
> class Borg(dict):
>
> static_state = {}
> def __init__(self):
> self.__dict__ = self.static_state
>
>
>
> My question is why this seems to work. I had the idea that
> there was a class object that is created when the file containing
> the definition is read, which actually contains the static
> information that is later accessed by instances. Isn't this
> done when the cherrypy app first loads, rather than each time
> a browser hits the app? Otherwise, where is the individual data
> stored for each of two simultaneous hits of the web page?
>
I had a similar question except mine was from a bug. (Thinking in c++
lead me to inadvertently create static class vars.)
You can "print self" and use the id() function to get the memory
addresses of the variables and see what's going on. In the code below,
mem4 is equivalent to your static_state.
count = 1
class Foo:
mem4 = {}
mem5 = {}
def __init__(self):
self.mem = {}
global count
count += 1
self.mem2 = count
self.mem3 = "%x" % (id(self))
self.mem5 = {}
print 'init count =', count
def me(self):
print "object: ", self
print "\tid(self.mem) %x" % (id(self.mem)), " self.mem
=", self.mem
print "\tid(self.mem2) %x" % (id(self.mem2)), "
self.mem2 =", self.mem2
print "\tid(self.mem3) %x" % (id(self.mem3)), "
self.mem3 =", self.mem3
print "\tid(self.mem4) %x" % (id(self.mem4)), "
self.mem4 =", self.mem4
print "\tid(self.mem5) %x" % (id(self.mem5)), "
self.mem5 =", self.mem5
global count
count += 1
print '\tcount =', count
self.mem4[count] = count
print "\tid(self.mem4) %x" % (id(self.mem4)), "
self.mem4 =", self.mem4
#self.mem += count
#print "\tid(self.mem) %x" % (id(self.mem)), " self.mem
=", self.mem
print
a = Foo()
b = Foo()
c = Foo()
a.me()
b.me()
c.me()
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