问题
I want to build a query for sunburnt(solr interface) using class inheritance and therefore adding key - value pairs together. The sunburnt interface takes keyword arguments. How can I transform a dict ({\'type\':\'Event\'}) into keyword arguments (type=\'Event\')?
回答1:
Use the double-star (aka double-splat?) operator:
func(**{'type':'Event'})
is equivalent to
func(type='Event')
回答2:
** operator would be helpful here.
** operator will unpack the dict elements and thus **{'type':'Event'} would be treated as type='Event'
func(**{'type':'Event'}) is same as func(type='Event') i.e the dict elements would be converted to the keyword arguments.
FYI
* will unpack the list elements and they would be treated as positional arguments.
func(*['one', 'two']) is same as func('one', 'two')
回答3:
Here is a complete example showing how to use the ** operator to pass values from a dictionary as keyword arguments.
>>> def f(x=2):
... print(x)
...
>>> new_x = {'x': 4}
>>> f() # default value x=2
2
>>> f(x=3) # explicit value x=3
3
>>> f(**new_x) # dictionary value x=4
4
来源：https://stackoverflow.com/questions/5710391/converting-python-dict-to-kwargs