Calling function keywords from a dictionary

[Peter Otten]

Alexander Straschil wrote:

> I have a dic like
>  dic = {
>  'action': 'myfunc',
> 'x': 1,
> 'y': 2,
> 'z': 3
>  }
>  and I have a method
>  def myfunc(x, y, z, a=None, b=None)

I assume you forgot the self parameter.
> 
> What I want to do ist calling the method defined in 'action' with
> all the named parameter, also instead of
>  self.myfunct(x=1, y=2, z=3)
> I want to do
>  f = getattr(self, dic['action'])
>  f(named parameter from the dic)

>>> class A:
...     def first(self, x, y, z, a=None, b=None):
...             print "calling first"
...             print "x =", x
...             print "a =", a
...
>>> a = A()
>>> d = dict(action="first", x=1, y=2, z=3)
>>> d
{'y': 2, 'x': 1, 'z': 3, 'action': 'first'}
# as a sideeffect, pop() removes "action" from the dictionary
# make a copy if that bothers you
>>> bm = getattr(a, d.pop("action")) 
>>> bm(**d)
calling first
x = 1
a = None
>>> d["a"] = 99
>>> bm(**d)
calling first
x = 1
a = 99

Peter