Velocity Reviews - Computer Hardware Reviews

Velocity Reviews > Newsgroups > Programming > Python > NameError question - def(self,master) - master not in namespacewithin class?

Reply
Thread Tools

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

 
 
harijay
Guest
Posts: n/a
 
      10-09-2008
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)
 
Reply With Quote
 
 
 
 
bieffe62@gmail.com
Guest
Posts: n/a
 
      10-09-2008
On 9 Ott, 17:43, harijay <(E-Mail Removed)> 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
-----
FB

Ciao
----
FB
 
Reply With Quote
 
 
 
 
Jerry Hill
Guest
Posts: n/a
 
      10-09-2008
On Thu, Oct 9, 2008 at 11:43 AM, harijay <(E-Mail Removed)> 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
>


<snip>

> #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)


The last line (starting with print), is not indented to the correct
level. Assuming it's supposed to be part of the child class's
__init__ method, it needs to line up with the rest of that method.

--
Jerry
 
Reply With Quote
 
harijay
Guest
Posts: n/a
 
      10-09-2008
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, (E-Mail Removed) wrote:
> On 9 Ott, 17:43, harijay <(E-Mail Removed)> 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
> -----
> FB
>
> Ciao
> ----
> FB


 
Reply With Quote
 
harijay
Guest
Posts: n/a
 
      10-09-2008
Thanks Jerry and beiff ,
Jerry was right, it was an indent problem . Between using my text
editor and running from commandline something went out of sync and I
didnt catch it probably.
I can now reproduce the error with a bad ident .

These are my first posts to comp.lang.python..and I am very grateful
to everyone for their time .

harijay

On Oct 9, 12:07*pm, "Jerry Hill" <(E-Mail Removed)> wrote:
> On Thu, Oct 9, 2008 at 11:43 AM, harijay <(E-Mail Removed)> 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

>
> <snip>
>
> > #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)

>
> The last line (starting with print), is not indented to the correct
> level. *Assuming it's supposed to be part of the child class's
> __init__ method, it needs to line up with the rest of that method.
>
> --
> Jerry


 
Reply With Quote
 
Bruno Desthuilliers
Guest
Posts: n/a
 
      10-09-2008
http://www.velocityreviews.com/forums/(E-Mail Removed) a écrit :
<OT>
bieffe, please, learn to snip irrelevant material...
</OT>
> On 9 Ott, 17:43, harijay <(E-Mail Removed)> wrote:

(snip)
>> NameError: name 'master' is not defined"


(snip)

>> #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)

(snip)
>> #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"

(snip)
>
> You need to have an import master in child.py too.


Nope. The 'child' class is passed a 'master' instance when instanciated.
You got confused by the bad naming.

<OP>
The convention in Python is to name classes in CamelCase. Your classes
should be named 'Master' and 'Child'.
</OP>
 
Reply With Quote
 
 
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Popen: NameError: name 'PIPE' is not defined Mathieu Prevot Python 3 05-24-2008 12:56 PM
NameError: global name 'Response' is not defined Lalit Python 1 04-24-2008 04:47 PM
NameError: name 'guess' is not defined willkab6@gmail.com Python 3 03-22-2008 04:10 PM
NameError: name 'main' is not defined jolly Python 2 12-19-2007 05:34 AM
seeking servlet "Master" keep getting "Master/servlet/Master" not found. Tomcat 5.0.25 Doug McCann Java 1 08-05-2004 09:16 PM



Advertisments