x, = y (???)

Duncan Booth duncan.booth at invalid.invalid
Thu Jul 17 23:02:42 CEST 2008


kj <socyl at 987jk.com.invalid> wrote:

> I still don't get it.  If we write 
> 
>   y  = 'Y'
>   x, = y
> 
> what's the difference now between x and y?  And if there's no
> difference, what's the point of performing such "unpacking"?

None whatsoever when the string has only one character, but with 2 
characters it becomes an obfuscated way of checking that there was only one 
character:

>>> x, = 'a'
>>> x, = 'ab'

Traceback (most recent call last):
  File "<pyshell#29>", line 1, in <module>
    x, = 'ab'
ValueError: too many values to unpack



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