I want to pass class method as and a default argument to another class method, so that I can reuse the method as a @classmethod
:
@classmethod
class foo:
def func1(self,x):
do somthing;
def func2(self, aFunc = self.func1):
# make some a call to afunc
afunc(4)
This is why when the method func2
is called within the class aFunc
defaults to self.func1
, but I can call this same function from outside of the class and pass it a different function at the input.
I get:
NameError: name 'self' is not defined
Here is my setup:
class transmissionLine:
def electricalLength(self, l=l0, f=f0, gamma=self.propagationConstant, deg=False):
开发者_开发百科
But I want to be able to call electricalLength
with a different function for gamma, like:
transmissionLine().electricalLength (l, f, gamma=otherFunc)
Default argument values are computed during function definition, not during function call. So no, you can't. You can do the following, however:
def func2(self, aFunc = None):
if aFunc is None:
aFunc = self.func1
...
The way you are trying wont work, because Foo isnt defined yet.
class Foo:
@classmethod
def func1(cls, x):
print 'something: ', cls, x
def func2(cls, a_func=Foo.func1):
a_func('test')
Foo.func2 = classmethod(func2)
Foo.func2()
You should write it like this:
class Foo(object):
@classmethod
def func1(cls, x):
print x
def func2(self, afunc=None):
if afunc is None:
afunc = self.func1
afunc(4)
Though it would be helpful if you gave a little more info on what you are trying to do. There is probably a more elegant way to do this without classmethods.
精彩评论