Print Window on IDLE

Tue Jun 7 02:22:44 EDT 2011

En 2011年6月06日 14:48:26 -0300, Steve Oldner <Steven.Oldner at la.gov> 
escribió:
> Seems to work using 2.7 but not 3.2. On 3.2 it just closes all my 
> python sessions. Is this a bug? Can someone point me to a "How To" on 
> using a local printer in windows?

It's a bug. Starting IDLE from the command line, one can actually see the 
error:
Exception in Tkinter callback
Traceback (most recent call last):
 File "D:\apps\python32\lib\tkinter\__init__.py", line 1399, in __call__
 return self.func(*args)
 File "D:\apps\python32\lib\idlelib\IOBinding.py", line 453, in 
print_window
 command = idleConf.GetOption('main','General','print-command-win')
 File "D:\apps\python32\lib\idlelib\configHandler.py", line 245, in 
GetOption
 type=type, raw=raw)
 File "D:\apps\python32\lib\idlelib\configHandler.py", line 54, in Get
 return self.get(section, option, raw=raw)
 File "D:\apps\python32\lib\configparser.py", line 789, in get
 d)
 File "D:\apps\python32\lib\configparser.py", line 391, in before_get
 self._interpolate_some(parser, option, L, value, section, defaults, 1)
 File "D:\apps\python32\lib\configparser.py", line 440, in 
_interpolate_some
 "found: %r" % (rest,))
configparser.InterpolationSyntaxError: '%' must be followed by '%' or '(', 
found
: '%s'

IDLE is attempting to read an entry from its configuration file, but fails 
because of a syntax error in the file (it's an error for a ConfigParser 
entry, %s should be %%s). The same entry was fine for earlier IDLE 
versions. As a workaround, you may edit the offending lines in your 
configuration file.
Go to the idlelib directory; if you don't know where it is, just open idle 
or Python command line and execute:
py> import idlelib
py> idlelib.__file__
'D:\\apps\\python32\\lib\\idlelib\\__init__.py'
In the same directory you'll find config-main.def; open it, and replace 
these lines in the [General] section:
print-command-posix=lpr %%s
print-command-win=start /min notepad /p %%s
(%s should become %%s). Tested on Windows, but Linux should have the same 
problem and temporary solution. You may need to roll this change back when 
the code is corrected.
Reported as http://bugs.python.org/issue12274
-- 
Gabriel Genellina