[Tutor] While loop issue, variable not equal to var or var

Steven D'Aprano steve at pearwood.info
Sat Jul 12 11:28:54 CEST 2014

On Sat, Jul 12, 2014 at 09:33:20AM +0100, Alan Gauld wrote:

> 2) Better (IMHO) is to convert message to lower case (or upper if
> you prefer) and only do one comparison:
> while message.lower() != 'q':

I second this advice, but with a slight modification.

If you're using Python 3.3 or higher, it is better to use 
message.casefold rather than lower. For English, there's no real 

py> "Hello World!".casefold()
'hello world!'

but it can make a difference for non-English languages:

py> "Große".lower()  # German for "great" or "large"
py> "Große".casefold()


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