Subset default arguments in Python

subsetdefault.py

#!/usr/bin/env python

def withvars(f):
    def wrapper(self,*args,**kwargs):
        tmp = self.vars.copy()
        tmp.update(kwargs)
        return f(self,*args,**tmp)
    return wrapper
def withvars_censor(f):
    def wrapper(self,*args,**kwargs):
        kwargs.update(self.vars)
        return f(self,*args,**kwargs)
    return wrapper

class Foo:
    def __init__(self):
        self.vars = dict(a=100,b=200,c=300,d=400,e=500)
    @withvars
    def f1(self,x,y,z,a,c,**unused):
        print(x,y,z,a,c)
    @withvars
    def f2(self,x,c,e,**unused):
        print(x,c,e)
    @withvars_censor
    def f2_censor(self,x,c,e,**unused):
        print(x,c,e)

foo = Foo()
foo.f1(1,2,3)           # 1 2 3 100 300
foo.f1(z=-3,x=-1,y=-2)  # -1 -2 -3 100 300
foo.f2(9)               # 9 300 500
foo.f2(9,c=10)          # 9 10 500
foo.f2_censor(9,c=10)   # 9 300 500