NameError question - def(self,master) - master not in namespace within class?
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
import child
File "/Users/hari/rpc-ccp4/tmp/child.py", line 1, in
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)
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Re: NameError question - def(self, master) - master not in namespace within class?
On 9 Ott, 17:43, harijay <[EMAIL PROTECTED]> 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
> import child
> File "/Users/hari/rpc-ccp4/tmp/child.py", line 1, in
> 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
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Re: NameError question - def(self, master) - master not in namespace within class?
On Thu, Oct 9, 2008 at 11:43 AM, harijay <[EMAIL PROTECTED]> 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 > > #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 -- http://mail.python.org/mailman/listinfo/python-list
Re: NameError question - def(self, master) - master not in namespace within class?
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, [EMAIL PROTECTED] wrote:
> On 9 Ott, 17:43, harijay <[EMAIL PROTECTED]> 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
> > import child
> > File "/Users/hari/rpc-ccp4/tmp/child.py", line 1, in
> > 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
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Re: NameError question - def(self, master) - master not in namespace within class?
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" <[EMAIL PROTECTED]> wrote: > On Thu, Oct 9, 2008 at 11:43 AM, harijay <[EMAIL PROTECTED]> 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 > > > > > #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 -- http://mail.python.org/mailman/listinfo/python-list
Re: NameError question - def(self,master) - master not in namespace within class?
[EMAIL PROTECTED] a écrit :
bieffe, please, learn to snip irrelevant material...
On 9 Ott, 17:43, harijay <[EMAIL PROTECTED]> 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.
The convention in Python is to name classes in CamelCase. Your classes
should be named 'Master' and 'Child'.
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