Python Cookbook dict problem

[Aldo Cortesi]

Thus spake Dave Reed (dreed at capital.edu):

> 
> I'm trying the following Python Cookbook recipe with python2.2
> 
> 
> def makedict(**kwargs):
>     return kwargs
> data = makedict(red=1, green=2, blue=3)
> def dodict(*args, **kwds):
>     d = {}
>     for k, v in args: d[k] = v
>     d.update(kwds)
>     return d
> tada = dodict(*data.items(), yellow=2, green=4)
> 
> 
> but I get an error with the last line:
> >>> tada = dodict(*data.items(), yellow=2, green=4)
>   File "<stdin>", line 1
>     tada = dodict(*data.items(), yellow=2, green=4)
>                                       ^
> SyntaxError: invalid syntax
> 
> What's wrong?


Dave,


Python expects you to do positional and keyword argument
unrolling at the end of the function argument list (i.e.
after all "normal" arguments). Change the last line to:  

tada = dodict(yellow=2, green=4, *data.items())

and Bob should be your metaphorical uncle.



Aldo




-- 
Aldo Cortesi
aldo at nullcube.com