problem writing to file

[Remco Gerlich]

Christian Maus <maus at netz.klinik.uni-mainz.de> wrote in comp.lang.python:
> I have a strange problem when I try to write to a file. I created a list
> named named new_ldapentries. I create a file object in write mode: 
> 		testfile = open('/tmp/testfile', 'w')
> then I go through the elements of my list and try to write them to the
> file:
> 		for i in range(len(new_ldapentries)):
> 			testfile.write(new_ldapentries[i])
> 		testfile.close()
> When I run the script I get the following error:
> 		Exception in Tkinter callback
> 		Traceback (innermost last):
>   		  File "/usr/lib/python1.5/lib-tk/Tkinter.py", line 764, in __call__
>     		    return apply(self.func, args)
>   		  File "python/emailmanager.py", line 333, in writeLDAPentry
>     		    testfile.write(new_ldapentries[line])
> 		TypeError: read-only buffer, instance
> 
> The strange thing is when I replace the new_ldapentries[line] with any
> String like 'hello' everything works fine.
> 
> Has anybody a idea where I made a mistake?

Did you use from ... import * somewhere? I think your open() function isn't
the usual builtin 'open file' function anymore. Try printing repr(open)
where that happens.

-- 
Remco Gerlich