On 10/2/2011 6:02 PM, Kevin Walzer wrote:
I'm seeing a very odd error in an application I'm developing using
Python 2.7.2, on Mac OS 10.7.
This application uses a wrapper method to look up other method names via
getattr and then call those methods. I have not previously had an issue
with this name, but for some reason this functionality no longer works
as expected.
Here is the relevant code:
#run command with root privileges
def runCommand(self, cmd, *args):
try:
functionstring = args[2]
callfunction = getattr(self, functionstring.split('.')[1])
self.passtext = self.tk.call('authorize::getAuthPassword')
callfunction()
except:
try:
print cmd
functionstring = cmd.split()[2]
callfunction = getattr(self, functionstring.split('.')[1])
self.passtext = self.tk.call('authorize::getAuthPassword')
callfunction()
except:
raise
I use this approach to call the method named in the "cmd" parameter
because I also have to look up a password name that is returned by an
underlying Tk package that I use in my application (that's the reason
for the 'self.tk.call'). What is happening is when I use the
"callfunction()" call, instead of the method name being called, a string
like this is being invoked:
<bound method phynchronicityApp.scanPackages of
<__main__.phynchronicityApp instance at 0x101b232d8>>
The "scanPackages" method (just to use it as an example) uses Popen to
call an underlying system tool on the OS. However, when invoked via
callfunction(), the 'bound method...' string is passed to the OS instead
as a command! As a result, I get this output from the pipe:
/bin/sh: bound: No such file or directory
I am not sure what in my application is causing this kind of breakage,
as earlier versions of the app ran fine with similar code on earlier
versions on the OS. Is this the correct way to structure this kind of
functionality, or am I better off structuring it some other way?
I do not know of any 2.7 changes that would affect such code. Perhaps
you changed something in the method being invoked (not shown)
.
You did not specify whether you have the problem in the first or second
try block. I would start with printing the type and value of some to all
of the variables.
--
Terry Jan Reedy
--
http://mail.python.org/mailman/listinfo/python-list
