Storing Python function parameters as a variable to call later

Question

I have a function where, based on different case, I'm changing the parameters sent to a function whose result I'm returning. I would like to just decide parameters in the middle of the method, and only have one return call at the bottom of my function. Please be aware this is not what my code looks like, it's just an example. I'm using Django, if that's relevant.

if x:
    return func(param1, param2, param3)
elif y:
    return func(param4, param5, param6)
elif z:
    return func(param7, param8, param9)

I would like this to read

if x:
    parameters = (param1, param2, param3)
elif y:
    parameters = (param4, param5, param6)
elif z:
    parameters = (param7, param8, param9)
return func(parameters)

Thanks for the help!

Answer 1

Use * to unpack the parameter tuple:

func(*parameters)

Demo:

def func(x,y,z):
     print x,y,z
>>> params = (1,2,3)
>>> func(*params)
1 2 3
>>> params = (4,5,6)
>>> func(*params)
4 5 6