Yes, a Python feature called string formatting
http://docs.python.org/2/library/stdtypes.html#string-formatting-operations
r['first_name'] and r['last_name'] are processed by their str function
because of the %s in "%s %s" the format specifier.
The standalone % is the operator specifying string formatting.
The result of the expression is a string containing the two strings with a
space separator.
On Saturday, 16 November 2013 22:41:16 UTC-8, Alex Glaros wrote:
>
> Thanks guys, it worked.
>
> Field('personDisplayName', compute=lambda r: "%s %s" % (r['first_name'], r
> ['last_name']))
>
> How would you identify the workings of each component, I mean does "%s %s"
> mean "put two strings together here that are identified after the percent
> sign?"
>
> Much appreciated!
>
> Alex
>
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