[EMAIL PROTECTED] wrote:
> Scott David Daniels wrote:
>> Gabriel Genellina wrote:
>> >... So `callback` should return a function, like this:
>> >
>> > def callback(text):
>> > def handler(event):
>> > print text
>> >
>>
>> Even better than that:
>> def callback(text):
>> def handler(event):
>> print text
>> return handler
>>
>> Otherwise callback returns the spectacularly un-useful value None.
> C:\dex_tracker\csdlist.py bay-at-night.csd
> Traceback (most recent call last):
> File "C:\dex_tracker\csdlist.py", line 58, in
> root.mainloop()
> File "C:\Python25\lib\lib-tk\Tkinter.py", line 1023, in mainloop
> self.tk.mainloop(n)
> File "../../..\Pmw\Pmw_1_2\lib\PmwBase.py", line 1751, in __call__
> File "../../..\Pmw\Pmw_1_2\lib\PmwBase.py", line 1777, in _reporterror
> TypeError: unsupported operand type(s) for +: 'type' and 'str'
> Script terminated.
>
> It doesn't like the return handler part of it.
Probably because a Tkinter.Button command callback doesn't accept any
arguments. Try
def callback(text):
def handler():
print text
return handler
Note that 'make_callback' would be a better name than 'callback' because the
function 'callback' actually creates the callback (called 'handler').
Peter
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