attribute error

[M.N.A.Smadi]

HI;

I am having the following error. I am using someone else's code and
all they are doing is pass an argv to a function then

def execute_action( manager, argv):
method_name = argv.pop(0).low er()


and am getting this strange error.
AttributeError: 'str' object has no attribute 'pop'

am using Python 2.3.4 and am importing the following libraries:

import sys, os, inspect
from Asterisk import Manager, BaseException, Config
import Asterisk.Util

but i always thought that something like this will be standard stuff.
Any ideas?

thanks
moe smadi

[Steven D'Aprano]

Re: attribute error

On Mon, 26 Sep 2005 18:28:56 -0400, M.N.A.Smadi wrote:
[color=blue]
> HI;
>
> I am having the following error. I am using someone else's code and
> all they are doing is pass an argv to a function then
>
> def execute_action( manager, argv):
> method_name = argv.pop(0).low er()
>
>
> and am getting this strange error.
> AttributeError: 'str' object has no attribute 'pop'[/color]

Since you haven't told us what you have passed as argv, I will look into
my crystal ball and use my psychic powers...

Things are unclear... no, wait, I see a glimmer of light... are you using
a single string, something like "this is a list of arguments"? The
function is expecting a list of strings ["this", "is", "a", "list", "of",
"arguments"].

You may find the split() method useful for breaking up a single string
into a list of strings.


--
Steven.

[Mike Meyer]

Re: attribute error

"M.N.A.Smad i" <smadim2@grads. ece.mcmaster.ca > writes:
[color=blue]
> HI;
>
> I am having the following error. I am using someone else's code and
> all they are doing is pass an argv to a function then
>
> def execute_action( manager, argv):
> method_name = argv.pop(0).low er()
>
>
> and am getting this strange error.
> AttributeError: 'str' object has no attribute 'pop'
>
> am using Python 2.3.4 and am importing the following libraries:
>
> import sys, os, inspect
> from Asterisk import Manager, BaseException, Config
> import Asterisk.Util
>
> but i always thought that something like this will be standard stuff.
> Any ideas?[/color]

Yes - show us the rest of the code. execute_action is never called in
the snippets you posted, and it's pretty clear that it's being invoked
with the wrong thing as an argument. Can you provide a minimal working
(well, executable) code sample that generates the error message you
are getting?

Oh yeah - post the full traceback as well.

<mike

--
Mike Meyer <mwm@mired.or g> http://www.mired.org/home/mwm/
Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.

[M.N.A.Smadi]

Re: attribute error

HI;

I am having the following error:

AttributeError: 'str' object has no attribute 'pop'

am using Python 2.3.4 and am importing the following libraries:

import sys, os, inspect
from Asterisk import Manager, BaseException, Config
import Asterisk.Util

The code being executed is:
if command not in commands:
raise ArgumentsError( 'invalid arguments.')



if command == 'usage':
return usage(argv[0], sys.stdout)

manager = Manager.Manager (*Config.Config ().get_connecti on())

if command == 'actions':
show_actions()

if command == 'help':
if len(argv) < 3:
raise ArgumentsError( 'please specify an action.')

show_actions(ar gv[2])

elif command == 'action':
if len(argv) < 3:
raise ArgumentsError( 'please specify an action.')

try:
execute_action( manager, argv[2:])
except TypeError, e:
print "Bad arguments specified. Help for %s:" % (argv[2],)
show_actions(ar gv[2])

elif command == 'command':
execute_action( 'command', argv[2])

def execute_action( manager, argv):
method_name = argv.pop(0).low er()



but i always thought that something like this will be standard stuff.
Any ideas?


Mike Meyer wrote:
[color=blue]
>"M.N.A.Smadi " <smadim2@grads. ece.mcmaster.ca > writes:
>
>
>[color=green]
>>HI;
>>
>>I am having the following error. I am using someone else's code and
>>all they are doing is pass an argv to a function then
>>
>>def execute_action( manager, argv):
>> method_name = argv.pop(0).low er()
>>
>>
>>and am getting this strange error.
>>AttributeErro r: 'str' object has no attribute 'pop'
>>
>>am using Python 2.3.4 and am importing the following libraries:
>>
>>import sys, os, inspect
>>from Asterisk import Manager, BaseException, Config
>>import Asterisk.Util
>>
>>but i always thought that something like this will be standard stuff.
>>Any ideas?
>>
>>[/color]
>
>Yes - show us the rest of the code. execute_action is never called in
>the snippets you posted, and it's pretty clear that it's being invoked
>with the wrong thing as an argument. Can you provide a minimal working
>(well, executable) code sample that generates the error message you
>are getting?
>
>Oh yeah - post the full traceback as well.
>
> <mike
>
>
>[/color]

[Mike Meyer]

Re: attribute error

In <433C4402.60504 08@grads.ece.mc master.ca>, M.N.A.Smadi <smadim2@grads. ece.mcmaster.ca > typed:[color=blue]
> HI;
>
> I am having the following error:
>
> AttributeError: 'str' object has no attribute 'pop'
>
> am using Python 2.3.4 and am importing the following libraries:
>
> import sys, os, inspect
> from Asterisk import Manager, BaseException, Config
> import Asterisk.Util
>
> The code being executed is:
> if command not in commands:
> raise ArgumentsError( 'invalid arguments.')
>
>
>
> if command == 'usage':
> return usage(argv[0], sys.stdout)
>
> manager = Manager.Manager (*Config.Config ().get_connecti on())
>
> if command == 'actions':
> show_actions()
>
> if command == 'help':
> if len(argv) < 3:
> raise ArgumentsError( 'please specify an action.')
>
> show_actions(ar gv[2])
>
> elif command == 'action':
> if len(argv) < 3:
> raise ArgumentsError( 'please specify an action.')
>
> try:
> execute_action( manager, argv[2:])
> except TypeError, e:
> print "Bad arguments specified. Help for %s:" % (argv[2],)
> show_actions(ar gv[2])
>
> elif command == 'command':
> execute_action( 'command', argv[2])[/color]

This should be execute_action( 'command', argv[2:]), with the ':' added.

<mike
[color=blue]
> def execute_action( manager, argv):
> method_name = argv.pop(0).low er()
>
>
>
> but i always thought that something like this will be standard stuff.
> Any ideas?
>
>
> Mike Meyer wrote:
>[color=green]
> >"M.N.A.Smadi " <smadim2@grads. ece.mcmaster.ca > writes:
> >
> >
> >[color=darkred]
> >>HI;
> >>
> >>I am having the following error. I am using someone else's code and
> >>all they are doing is pass an argv to a function then
> >>
> >>def execute_action( manager, argv):
> >> method_name = argv.pop(0).low er()
> >>
> >>
> >>and am getting this strange error.
> >>AttributeErro r: 'str' object has no attribute 'pop'
> >>
> >>am using Python 2.3.4 and am importing the following libraries:
> >>
> >>import sys, os, inspect
> >>from Asterisk import Manager, BaseException, Config
> >>import Asterisk.Util
> >>
> >>but i always thought that something like this will be standard stuff.
> >>Any ideas?
> >>
> >>[/color]
> >
> >Yes - show us the rest of the code. execute_action is never called in
> >the snippets you posted, and it's pretty clear that it's being invoked
> >with the wrong thing as an argument. Can you provide a minimal working
> >(well, executable) code sample that generates the error message you
> >are getting?
> >
> >Oh yeah - post the full traceback as well.
> >
> > <mike
> >
> >
> >[/color]
>
>[/color]

--
Mike Meyer <mwm@mired.or g> http://www.mired.org/consulting.html
Independent Network/Unix/Perforce consultant, email for more information.

[M.N.A.Smadi]

Re: attribute error

This has nothing to do with how the argument is passed. It is prob
something wrong with str.pop in my python because when i run python and type
import os
import string
x = '1 2 3'
x.pop()

i get the following error
Traceback (most recent call last):
File "<stdin>", line 1, in ?
AttributeError: 'str' object has no attribute 'pop'


Mike Meyer wrote:
[color=blue]
>In <433C4402.60504 08@grads.ece.mc master.ca>, M.N.A.Smadi <smadim2@grads. ece.mcmaster.ca > typed:
>
>[color=green]
>>HI;
>>
>>I am having the following error:
>>
>>AttributeErro r: 'str' object has no attribute 'pop'
>>
>>am using Python 2.3.4 and am importing the following libraries:
>>
>>import sys, os, inspect
>>from Asterisk import Manager, BaseException, Config
>>import Asterisk.Util
>>
>>The code being executed is:
>> if command not in commands:
>> raise ArgumentsError( 'invalid arguments.')
>>
>>
>>
>> if command == 'usage':
>> return usage(argv[0], sys.stdout)
>>
>> manager = Manager.Manager (*Config.Config ().get_connecti on())
>>
>> if command == 'actions':
>> show_actions()
>>
>> if command == 'help':
>> if len(argv) < 3:
>> raise ArgumentsError( 'please specify an action.')
>>
>> show_actions(ar gv[2])
>>
>> elif command == 'action':
>> if len(argv) < 3:
>> raise ArgumentsError( 'please specify an action.')
>>
>> try:
>> execute_action( manager, argv[2:])
>> except TypeError, e:
>> print "Bad arguments specified. Help for %s:" % (argv[2],)
>> show_actions(ar gv[2])
>>
>> elif command == 'command':
>> execute_action( 'command', argv[2])
>>
>>[/color]
>
>This should be execute_action( 'command', argv[2:]), with the ':' added.
>
> <mike
>
>
>[color=green]
>>def execute_action( manager, argv):
>> method_name = argv.pop(0).low er()
>>
>>
>>
>>but i always thought that something like this will be standard stuff.
>>Any ideas?
>>
>>
>>Mike Meyer wrote:
>>
>>
>>[color=darkred]
>>>"M.N.A.Smadi " <smadim2@grads. ece.mcmaster.ca > writes:
>>>
>>>
>>>
>>>
>>>
>>>>HI;
>>>>
>>>>I am having the following error. I am using someone else's code and
>>>>all they are doing is pass an argv to a function then
>>>>
>>>>def execute_action( manager, argv):
>>>> method_name = argv.pop(0).low er()
>>>>
>>>>
>>>>and am getting this strange error.
>>>>AttributeEr ror: 'str' object has no attribute 'pop'
>>>>
>>>>am using Python 2.3.4 and am importing the following libraries:
>>>>
>>>>import sys, os, inspect
>>>>
>>>>
>>>>from Asterisk import Manager, BaseException, Config
>>>
>>>
>>>>import Asterisk.Util
>>>>
>>>>but i always thought that something like this will be standard stuff.
>>>>Any ideas?
>>>>
>>>>
>>>>
>>>>
>>>Yes - show us the rest of the code. execute_action is never called in
>>>the snippets you posted, and it's pretty clear that it's being invoked
>>>with the wrong thing as an argument. Can you provide a minimal working
>>>(well, executable) code sample that generates the error message you
>>>are getting?
>>>
>>>Oh yeah - post the full traceback as well.
>>>
>>> <mike
>>>
>>>
>>>
>>>
>>>[/color]
>>
>>[/color]
>
>
>[/color]

[Mike Meyer]

Re: attribute error

In <433C473B.90509 01@grads.ece.mc master.ca>, M.N.A.Smadi <smadim2@grads. ece.mcmaster.ca > typed:[color=blue]
> This has nothing to do with how the argument is passed. It is prob
> something wrong with str.pop in my python because when i run python and type
> import os
> import string
> x = '1 2 3'
> x.pop()
>
> i get the following error
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> AttributeError: 'str' object has no attribute 'pop'[/color]

The only thing wrong with str.pop is that you're trying to invoke
it. The interpreter is telling you that string doesn't *have* a pop
method. The interpreter is right. Strings are immutable, so "pop"
doesn't make any sense for them.

<mike
[color=blue]
>
> Mike Meyer wrote:
>[color=green]
> >In <433C4402.60504 08@grads.ece.mc master.ca>, M.N.A.Smadi <smadim2@grads. ece.mcmaster.ca > typed:
> >
> >[color=darkred]
> >>HI;
> >>
> >>I am having the following error:
> >>
> >>AttributeErro r: 'str' object has no attribute 'pop'
> >>
> >>am using Python 2.3.4 and am importing the following libraries:
> >>
> >>import sys, os, inspect
> >>from Asterisk import Manager, BaseException, Config
> >>import Asterisk.Util
> >>
> >>The code being executed is:
> >> if command not in commands:
> >> raise ArgumentsError( 'invalid arguments.')
> >>
> >>
> >>
> >> if command == 'usage':
> >> return usage(argv[0], sys.stdout)
> >>
> >> manager = Manager.Manager (*Config.Config ().get_connecti on())
> >>
> >> if command == 'actions':
> >> show_actions()
> >>
> >> if command == 'help':
> >> if len(argv) < 3:
> >> raise ArgumentsError( 'please specify an action.')
> >>
> >> show_actions(ar gv[2])
> >>
> >> elif command == 'action':
> >> if len(argv) < 3:
> >> raise ArgumentsError( 'please specify an action.')
> >>
> >> try:
> >> execute_action( manager, argv[2:])
> >> except TypeError, e:
> >> print "Bad arguments specified. Help for %s:" % (argv[2],)
> >> show_actions(ar gv[2])
> >>
> >> elif command == 'command':
> >> execute_action( 'command', argv[2])
> >>
> >>[/color]
> >
> >This should be execute_action( 'command', argv[2:]), with the ':' added.
> >
> > <mike
> >
> >
> >[color=darkred]
> >>def execute_action( manager, argv):
> >> method_name = argv.pop(0).low er()
> >>
> >>
> >>
> >>but i always thought that something like this will be standard stuff.
> >>Any ideas?
> >>
> >>
> >>Mike Meyer wrote:
> >>
> >>
> >>
> >>>"M.N.A.Smadi " <smadim2@grads. ece.mcmaster.ca > writes:
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>>HI;
> >>>>
> >>>>I am having the following error. I am using someone else's code and
> >>>>all they are doing is pass an argv to a function then
> >>>>
> >>>>def execute_action( manager, argv):
> >>>> method_name = argv.pop(0).low er()
> >>>>
> >>>>
> >>>>and am getting this strange error.
> >>>>AttributeEr ror: 'str' object has no attribute 'pop'
> >>>>
> >>>>am using Python 2.3.4 and am importing the following libraries:
> >>>>
> >>>>import sys, os, inspect
> >>>>
> >>>>
> >>>>from Asterisk import Manager, BaseException, Config
> >>>
> >>>
> >>>>import Asterisk.Util
> >>>>
> >>>>but i always thought that something like this will be standard stuff.
> >>>>Any ideas?
> >>>>
> >>>>
> >>>>
> >>>>
> >>>Yes - show us the rest of the code. execute_action is never called in
> >>>the snippets you posted, and it's pretty clear that it's being invoked
> >>>with the wrong thing as an argument. Can you provide a minimal working
> >>>(well, executable) code sample that generates the error message you
> >>>are getting?
> >>>
> >>>Oh yeah - post the full traceback as well.
> >>>
> >>> <mike
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>[/color]
> >
> >
> >[/color]
>
>[/color]

--
Mike Meyer <mwm@mired.or g> http://www.mired.org/consulting.html
Independent Network/Unix/Perforce consultant, email for more information.

[Steve Holden]

Re: attribute error

Mike Meyer wrote:[color=blue]
> In <433C473B.90509 01@grads.ece.mc master.ca>, M.N.A.Smadi <smadim2@grads. ece.mcmaster.ca > typed:
>[color=green]
>>This has nothing to do with how the argument is passed. It is prob
>>something wrong with str.pop in my python because when i run python and type
>>import os
>>import string
>>x = '1 2 3'
>>x.pop()
>>
>>i get the following error
>>Traceback (most recent call last):
>> File "<stdin>", line 1, in ?
>>AttributeErro r: 'str' object has no attribute 'pop'[/color]
>
>
> The only thing wrong with str.pop is that you're trying to invoke
> it. The interpreter is telling you that string doesn't *have* a pop
> method. The interpreter is right. Strings are immutable, so "pop"
> doesn't make any sense for them.
>
> <mike
> [...][/color]

Just to hammer the point home:

Python 2.4.1 (#1, May 27 2005, 18:02:40)
[GCC 3.3.3 (cygwin special)] on cygwin
Type "help", "copyright" , "credits" or "license" for more information.[color=blue][color=green][color=darkred]
>>> x = '1 2 3'
>>> x.pop()[/color][/color][/color]
Traceback (most recent call last):
File "<stdin>", line 1, in ?
AttributeError: 'str' object has no attribute 'pop'[color=blue][color=green][color=darkred]
>>> x = [1, 2, 3]
>>> x.pop()[/color][/color][/color]
3[color=blue][color=green][color=darkred]
>>> x.pop()[/color][/color][/color]
2[color=blue][color=green][color=darkred]
>>> x[/color][/color][/color]
[1][color=blue][color=green][color=darkred]
>>>[/color][/color][/color]

So if you genuinely have a string containing the values, split it onto a
list first using something like

x = x.split()

regards
Steve
--
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC www.holdenweb.com
PyCon TX 2006 www.pycon.org

[Steve Holden]

Re: attribute error

Mike Meyer wrote:[color=blue]
> In <433C473B.90509 01@grads.ece.mc master.ca>, M.N.A.Smadi <smadim2@grads. ece.mcmaster.ca > typed:
>[color=green]
>>This has nothing to do with how the argument is passed. It is prob
>>something wrong with str.pop in my python because when i run python and type
>>import os
>>import string
>>x = '1 2 3'
>>x.pop()
>>
>>i get the following error
>>Traceback (most recent call last):
>> File "<stdin>", line 1, in ?
>>AttributeErro r: 'str' object has no attribute 'pop'[/color]
>
>
> The only thing wrong with str.pop is that you're trying to invoke
> it. The interpreter is telling you that string doesn't *have* a pop
> method. The interpreter is right. Strings are immutable, so "pop"
> doesn't make any sense for them.
>
> <mike
> [...][/color]

Just to hammer the point home:

Python 2.4.1 (#1, May 27 2005, 18:02:40)
[GCC 3.3.3 (cygwin special)] on cygwin
Type "help", "copyright" , "credits" or "license" for more information.[color=blue][color=green][color=darkred]
>>> x = '1 2 3'
>>> x.pop()[/color][/color][/color]
Traceback (most recent call last):
File "<stdin>", line 1, in ?
AttributeError: 'str' object has no attribute 'pop'[color=blue][color=green][color=darkred]
>>> x = [1, 2, 3]
>>> x.pop()[/color][/color][/color]
3[color=blue][color=green][color=darkred]
>>> x.pop()[/color][/color][/color]
2[color=blue][color=green][color=darkred]
>>> x[/color][/color][/color]
[1][color=blue][color=green][color=darkred]
>>>[/color][/color][/color]

So if you genuinely have a string containing the values, split it onto a
list first using something like

x = x.split()

regards
Steve
--
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC www.holdenweb.com
PyCon TX 2006 www.pycon.org

[Steven D'Aprano]

Re: attribute error

On Thu, 29 Sep 2005 15:57:47 -0400, M.N.A.Smadi wrote:
[color=blue]
> This has nothing to do with how the argument is passed. It is prob
> something wrong with str.pop in my python because when i run python and type
> import os
> import string
> x = '1 2 3'
> x.pop()
>
> i get the following error
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> AttributeError: 'str' object has no attribute 'pop'[/color]


That's because strings don't have a pop method, just like the error says.
Did you read the error? Error messages frequently tell you what the error
is.

Lists have a pop method. You can't pop from a string. If you try
to pop from a string, you will get an error. You tried to pop from a
string, and it gave an error. The error told you what you did wrong:
you tried to pop from a string. Why are you surprised?

Go back to your code. Look at the variable that you are trying to pop
from, and notice that it is a string, just like the error message says.
Now search back through your code until you find the place where you
assign a string to that variable. Don't assign a string to it.

Problem fixed.

Like I said the first time I answered your question, I think your problem
is that you are passing in a single argument string like:

"this is a list of commands"

instead of a real list like:

["this", "is", "a", "list", "of", "commands"]

As I also said the first time I answered this, you may find the split()
string method useful for creating that list. (Hint: if x is a string, you
call x.split() and get back a list.)

For future reference: any time you think you have found a bug in Python,
the chances are about 999,999 in a million that you've found a bug in your
code.


--
Steven.