[Python-Dev] [PEP] += on return of function call result

[Andrew Koenig]

Luke> example code:
Luke> log = {}

Luke> 	for t in range(5):
Luke> 		for r in range(10):
Luke> 			log.setdefault(r, '') += "test %d\n" % t

Luke> pprint(log)

Luke> instead, as the above is not possible, the following must be used:

Luke> from operator import add

Luke>  ...
Luke>       ...
Luke> 	      ...

Luke> 			add(log.setdefault(r, ''), "test %d\n" % t)

Luke> ... ARGH!  just checked - NOPE!  add doesn't work.
Luke> and there's no function "radd" or "__radd__" in the
Luke> operator module.

Why can't you do this?

        for t in range(5):
                for r in range(10):
                        foo = log.setdefault(r,'')
                        foo += "test %d\n" % t



-- 
Andrew Koenig, ark@research.att.com, http://www.research.att.com/info/ark