[Tutor] **kw and self

[Remco Gerlich]

On  0, Willi Richert <w.richert@gmx.net> wrote:
> Why can't I just pass a dictionary? Why do I have to put ** before it?

Because then it would be passed as just a dictionary, a single argument.

Like

>>> def add(a, b): return a+b
>>> dict = {'a': 1, 'b': 2}
>>> add(dict)
TypeError: add() takes exactly 2 arguments (1 given)

It's the same as
>>> add(a = {'a':1, 'b': 2})

which is an error because 'b' gets no value.

>>> add(**dict)
3

You need the ** to tell Python you want to use the dictionary for keyword
arguments.

-- 
Remco Gerlich