Greg wrote:
......
The ** thing can be used in two ways
1) to allow extra keyword arguments to be collected into a single dictionary
inside a function.
eg
def func0(a0,a1,a2,b0=30,b1=31,**kwds):
print a0,a1,a2,b0,b1,kwds
func0(0,1,2,c0=40,c1=42)
should print
0 1 2 30 31 {'c1': 42, 'c0': 40}
2) You can pass a dictionary into a function as though the keys were passed as
key=value.
eg
D=dict(a0=-0,a1=-1,a2=-2,b0=-30,b1=-31,c0=-40,c1=-41)
func0(**D)
0 -1 -2 -30 -31 {'c1': -41, 'c0': -40}
note that you can pass fixed arguments as though they were keywords. In the
function the **kwds argument picks up keywords that are not known in the
definition. If the dictionary didn't contain the fixed arguments (ie the ones
without defaults) we'd still have to pass those positionally
eg
D=dict(c0=50)
func0(10,11,12,**D)
10 11 12 30 31 {'c0': 50}
theer's an equivalent concept for positional arguments that uses a single *
--
Robin Becker
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