Are arguments to python __init__ method passed as pointers? In a threading.Thread?

Hi,

I'm new to python, and having problems instantiating classes. My main method has a couple of lines like this:

debug = False
stats_d = {"cpu":[],"foo":[],"bar":[],"baz":[]}
cpu.CpuMonitor(debug,stats_d["cpu"]).start()
db.UpdateDatabase(debug,stats_d).start()

And CpuMonitor looks like this:

class CpuMonitor (threading.Thread):

def __init__ (self, debug, resultslist):

threading.Thread.__init__(self)

self.debug = debug
self.resultslist = resultslist

def run ( self ) :
# some stuff
items = ('stuff','morestuff','otherstuff')
self.resultslist.append(items)

I was expecting to be able to populate my dictionary lists within CpuMonitor and then use them within the UpdateDatabase thread. However, while the local copy of CpuMonitor does create entries in it's resultslist variable, neither the main method or the UpdateDatabase thread see anything other than an empty list for each dictionary entry.

The same problem occurs with the debug variable. Setting debug to true within the CpuMonitor thread turns on debug for CpuMonitor, but not the rest of the program.

This leads me to believe that the way I've built the __init__ method is creating copies of the variables rather than pointers to the originals. Is that the case? If so, how to I achieve what I'm trying to do (preferrably without using global variables)?

Many thanks,
Matt.

Hi,

I'm new to python, and having problems instantiating classes. My main method has a couple of lines like this:

Expand|Select|Wrap|Line Numbers

1.     debug = False
2.     stats_d = {"cpu":[],"foo":[],"bar":[],"baz":[]}
3.     cpu.CpuMonitor(debug,stats_d["cpu"]).start()
4.     db.UpdateDatabase(debug,stats_d).start()
5.  

And CpuMonitor looks like this:

Expand|Select|Wrap|Line Numbers

1. class CpuMonitor (threading.Thread):
2.  
3.     def __init__ (self, debug, resultslist):
4.  
5.         threading.Thread.__init__(self)        
6.  
7.         self.debug = debug
8.         self.resultslist = resultslist
9.  
10.     def run ( self ) :
11.          # some stuff
12.          items = ('stuff','morestuff','otherstuff')
13.          self.resultslist.append(items)
14.  

I was expecting to be able to populate my dictionary lists within CpuMonitor and then use them within the UpdateDatabase thread. However, while the local copy of CpuMonitor does create entries in it's resultslist variable, neither the main method or the UpdateDatabase thread see anything other than an empty list for each dictionary entry.

The same problem occurs with the debug variable. Setting debug to true within the CpuMonitor thread turns on debug for CpuMonitor, but not the rest of the program.

This leads me to believe that the way I've built the __init__ method is creating copies of the variables rather than pointers to the originals. Is that the case? If so, how to I achieve what I'm trying to do (preferrably without using global variables)?

Many thanks,
Matt.