Python 3 and easygui problem

[Terry Reedy]

Chris Rebert wrote:
> On Sat, Feb 21, 2009 at 8:46 PM, Peter Anderson
> <peter.anderson at internode.on.net> wrote:
>> I have just installed Python 3. I have been using Tkinter and easygui (with
>> Python 2.5.4) for any GUI needs. I have just started to port some of my
>> existing scripts to Python 3 and discovered problems with easygui.
>>
>> I was using the following script for testing:
> <snip>
> 
>> File "C:\Python30\lib\site-packages\easygui.py", line 824, in __choicebox
>> choices.sort( lambda x,y: cmp(x.lower(), y.lower())) # case-insensitive sort
>> TypeError: must use keyword argument for key function
> 
> Change the line to
> 
> choices.sort(key=lambda x,y: cmp(x.lower(), y.lower()))

The key function must take one arg, not two, as with Gabriel's solution: 
str.lower.