Re: Classes and threading
On May 19, 12:04 am, Erik Max Francis m...@alcyone.com wrote:
Adam W. wrote:
I thought I knew how classes worked, but this code sample is making my
second guess myself:
import threading
class nThread(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
def run(self,args):
print self.name
print self.args
pants = nThread(args=('fruit'),name='charlie')
pants.start()
Traceback (most recent call last):
File C:\Users\Adam\Desktop\PyTiVo\task_master.py, line 13, in
module
pants = nThread(args=('fruit'),name='charlie')
TypeError: __init__() got an unexpected keyword argument 'args'
Shouldn't __init__ still handle these (as per
http://docs.python.org/library/threading.html#thread-objects), even
if its subclassed? I thought this was the whole idea of inheritance
and overdriving.
You've overridden the __init__ method to _not_ take any arguments, and
explicitly call its parent constructor not passing anything. So it
shouldn't be a wonder that it won't accept any arguments.
If you don't intend to override the constructor in the parent class,
simply don't define it.
Hummm, so lets say I wanted it pass all the variables to the parent
constructor, how would I do that? I wouldn't have to list every
variable it could possible receive would I?
This is like the opposite behavior I remember. When working with PyQt
GUI classes, I swear I just sub classed the few things I wanted to
change, and everything else would refer back to the parent...
What I really just want to do is pass run() some args, which is what I
assumed the default __init__'s args was for, but I give it args
without sub classing __init__ and it has no idea what to do with
them. I subclass __init__ to take args, and I break everything else?
Is this really how this is supposed to work?
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Re: Classes and threading
Adam W. awasile...@gmail.com wrote: If you don't intend to override the constructor in the parent class, simply don't define it. Hummm, so lets say I wanted it pass all the variables to the parent constructor, how would I do that? I wouldn't have to list every variable it could possible receive would I? No, you just have to handle them the way you would for any function that accepts arguments that it doesn't know in advance: class nThread(threading.Thread): def __init__(self, *args, **kw): threading.Thread.__init__(self, *args, **kw) If you want to add your own additional arguments then name them explicitly and don't pass them through: class nThread(threading.Thread): def __init__(self, myarg1, mayarg2, *args, **kw): threading.Thread.__init__(self, *args, **kw) -- Duncan Booth http://kupuguy.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Classes and threading
Erik Max Francis wrote: Adam W. wrote: class nThread(threading.Thread): def __init__(self): threading.Thread.__init__(self) If you don't intend to override the constructor in the parent class, simply don't define it. Or if you do need to override it for some reason, you need to accept the extra args and pass them on: class nThread(threading.Thread): def __init__(self, *args, **kwds): threading.Thread.__init__(self, *args, **kwds) # your other stuff here -- Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: Classes and threading
On May 19, 4:30 am, Gregory Ewing greg.ew...@canterbury.ac.nz wrote: Or if you do need to override it for some reason, you need to accept the extra args and pass them on: class nThread(threading.Thread): def __init__(self, *args, **kwds): threading.Thread.__init__(self, *args, **kwds) # your other stuff here Amazing, I've never seen *args used before outside of documentation, I didn't think it was real :P One problem down, still looking for why printing inside a thread crashes IDLE. -- http://mail.python.org/mailman/listinfo/python-list
Re: Classes and threading
Or if you do need to override it for some reason, you need to accept the extra args and pass them on: class nThread(threading.Thread): def __init__(self, *args, **kwds): threading.Thread.__init__(self, *args, **kwds) # your other stuff here Since Thread is a new style class, this should read: class NThread(threading.thread): def __init__(self, *args, **kwargs): super(NThread, self).__init__(*args, **kwargs) Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: Classes and threading
In article mailman.399.1274262243.32709.python-l...@python.org, Christian Heimes li...@cheimes.de wrote: class nThread(threading.Thread): def __init__(self, *args, **kwds): threading.Thread.__init__(self, *args, **kwds) # your other stuff here Since Thread is a new style class, this should read: class NThread(threading.thread): def __init__(self, *args, **kwargs): super(NThread, self).__init__(*args, **kwargs) Should is too strong. There are plenty of reasons for wanting to avoid the mess of super(). -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ f u cn rd ths, u cn gt a gd jb n nx prgrmmng. -- http://mail.python.org/mailman/listinfo/python-list
Classes and threading
I thought I knew how classes worked, but this code sample is making my
second guess myself:
import threading
class nThread(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
def run(self,args):
print self.name
print self.args
pants = nThread(args=('fruit'),name='charlie')
pants.start()
Traceback (most recent call last):
File C:\Users\Adam\Desktop\PyTiVo\task_master.py, line 13, in
module
pants = nThread(args=('fruit'),name='charlie')
TypeError: __init__() got an unexpected keyword argument 'args'
Shouldn't __init__ still handle these (as per
http://docs.python.org/library/threading.html#thread-objects ), even
if its subclassed? I thought this was the whole idea of inheritance
and overdriving.
And sort of related, why does this crash IDLE GUI but not the command
line?:
import threading
class nThread(threading.Thread):
def run(self):
print 2+2
pants = nThread()
pants.start()
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Re: Classes and threading
Adam W. wrote:
I thought I knew how classes worked, but this code sample is making my
second guess myself:
import threading
class nThread(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
def run(self,args):
print self.name
print self.args
pants = nThread(args=('fruit'),name='charlie')
pants.start()
Traceback (most recent call last):
File C:\Users\Adam\Desktop\PyTiVo\task_master.py, line 13, in
module
pants = nThread(args=('fruit'),name='charlie')
TypeError: __init__() got an unexpected keyword argument 'args'
Shouldn't __init__ still handle these (as per
http://docs.python.org/library/threading.html#thread-objects ), even
if its subclassed? I thought this was the whole idea of inheritance
and overdriving.
You've overridden the __init__ method to _not_ take any arguments, and
explicitly call its parent constructor not passing anything. So it
shouldn't be a wonder that it won't accept any arguments.
If you don't intend to override the constructor in the parent class,
simply don't define it.
--
Erik Max Francis m...@alcyone.com http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM/Y!M/Skype erikmaxfrancis
I like young girls. Their stories are shorter.
-- Thomas McGuane
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