NameError question - def(self, master) - master not in namespace within class?

[harijay]

Thanks beiff for your prompt reply - But I shouldnt need to import
master in child.

Actually and very strangely. The problem fixed itself without any
change to my code.
I dont understand how. It may have been a problem with a bad *.pyc
lingering around . But now I cannot get the old NameError to repeat
itself..its very weird
Here is the new code and it runs just fine ..I am absolutely confused
as to why it failed several times in a row and then fixed itself.


Here is the new code just to convince myself that there is absolutely
no change;


#File runner.py
#!/usr/bin/python
import master
import child

if __name__=="__main__":
	print "RUNNING RUNNER"
	m = master.master("hj","oldhj")
	s = child.child(m)
	print "Now I have the variable master name %s and master.trash %s" %
(m.name , m.trash)


#File child.py
class child():

	def __init__(self,master):
		print "Master  name is %s" % master.name
		print  "Now seeting master name to setnameinchild in child.py "
		tmp = master.trash
		master.trash = master.name
		master.name = "setnameinchild"
		print "Reset name now from %s to %s , oldname %s is saved in
mastertrash" % (master.trash, master.name , master.trash)

#File master.py
class master():
	name=""
	trash=""

	def __init__(self,name,trash):
		self.name = name
		self.trash = trash

Produces the output:
hazel:tmp hari$ python runner.py
RUNNING RUNNER
Master  name is hj
Now seeting master name to setnameinchild in child.py
Reset name now from hj to setnameinchild , oldname hj is saved in
mastertrash
Now I have the variable master name setnameinchild and master.trash hj

On Oct 9, 11:54 am, bieff... at gmail.com wrote:
> On 9 Ott, 17:43, harijay <hari... at gmail.com> wrote:
>
>
>
> > Hi I am new to writing module and object oriented python code. I am
> > trying to understand namespaces and classes in python.
>
> > I have the following test case given in three files runner , master
> > and child. I am getting an error within child where in one line it
> > understands variable master.name and in the next line it gives a
> > NameError as given here
>
> > "    print "Reset name now from %s to %s , oldname %s is saved in
> > mastertrash" % (master.trash, master.name , master.trash)
> > NameError: name 'master' is not defined"
>
> > Sorry for a long post because I dont know how to  frame my question.
> > I am pasting the code contained in the three files and the error
> > message here
> > Thanks for your help
> > harijay
>
> > The detailed error I get is
> > hazel:tmp hari$ python runner.py
> > Traceback (most recent call last):
> >   File "runner.py", line 3, in <module>
> >     import child
> >   File "/Users/hari/rpc-ccp4/tmp/child.py", line 1, in <module>
> >     class child():
> >   File "/Users/hari/rpc-ccp4/tmp/child.py", line 9, in child
> >     print "Reset name now from %s to %s , oldname %s is saved in
> > mastertrash" % (master.trash, master.name , master.trash)
> > NameError: name 'master' is not defined
>
> > #File runner.py
> > #!/usr/bin/python
> > import master
> > import child
>
> > if __name__=="__main__":
> >         print "RUNNING RUNNER"
> >         m = master.master("hj","oldhj")
> >         s = child.child(m)
> >         print "Now I have the variable master name %s and master.trash %s" %
> > (m.name , m.trash)
>
> > #File master.py
> > class master():
> >         name=""
> >         trash=""
>
> >         def __init__(self,name,trash):
> >                 self.name = name
> >                 self.trash = trash
>
> > #File child.py
> > class child():
> >         def __init__(self,master):
> >                 print "Master  name is %s" % master.name
> >                 print  "Now seeting master name to setnameinchild in child.py "
> >                 tmp = master.trash
> >                 master.trash = master.name
> >                 master.name = "setnameinchild"
> >         print "Reset name now from %s to %s , oldname %s is saved in
> > mastertrash" % (master.trash, master.name , master.trash)
>
> You need to have an import master in child.py too.
>
> Ciao
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