I am running a tkinter tutor downloaded from web,
https://github.com/daleathan/widget-tour-py3. there are two files involved:
--------------------
#file button.py
from tkinter import *
from tkinter.ttk import *
import infrastructure
...
class ButtonsDemoWindow( infrastructure.DemoWindow ):
...
def __init__( self ):
...
...
for c in ('Peach Puff', 'Light Blue', 'Sea Green', 'Yellow' ):
b = Button(self.frame, text=c)
b['command'] = infrastructure.callit( self.callback, c )
b.pack( side=TOP, expand=YES, pady=2 )
def callback(self, color):
self.frame['background']=color
def runDemo():
ButtonsDemoWindow()
----------------------
#file infrastructure.py
...
class DemoWindow( Toplevel ):
...
...
class callit:
def __init__(self, function, *args ):
self.f = function
self.args = args
def __call__(self, *ignored):
self.f( *self.args)
--------------------
I run it under the DOS box:
D:\Works\Python\widget-tour-py3-master>python
Python 3.4.4 (v3.4.4:737efcadf5a6, Dec 20 2015, 19:28:18) [MSC v.1600 32
bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import button
>>> button.runDemo()
after the window shows up, I pressed one of the buttons and get the error below:
>>> Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python34\lib\tkinter\__init__.py", line 1538, in __call__
return self.func(*args)
File "D:\Works\Python\widget-tour-py3-master\infrastructure.py", line 216, in
__call__
self.f( *self.args)
File "D:\Works\Python\widget-tour-py3-master\button.py", line 39, in callback
self.frame['background']=color
File "C:\Python34\lib\tkinter\__init__.py", line 1331, in __setitem__
self.configure({key: value})
File "C:\Python34\lib\tkinter\__init__.py", line 1324, in configure
return self._configure('configure', cnf, kw)
File "C:\Python34\lib\tkinter\__init__.py", line 1315, in _configure
self.tk.call(_flatten((self._w, cmd)) + self._options(cnf))
_tkinter.TclError: unknown option "-background"
When I looked into the file tkinter\__init__.py, I found there is codes which
add conditionally a '-' onto the original cnf argument:
1305 def _configure(self, cmd, cnf, kw):
1306 """Internal function."""
...
...
1313 if isinstance(cnf, str):
1314 return self._getconfigure1(_flatten((self._w, cmd, '-'+cnf)))
Is it the reason this exception raised? Why is that?
Best Regards,
Jach Fong
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