Westley MartÃnez wrote:
On Fri, 2011-02-04 at 13:08 -0800, Wanderer wrote:
I want to give the option of changing attributes in a method or using
the current values of the attributes as the default.
class MyClass():
""" my Class
"""
def __init__(self):
""" initialize
"""
self.a = 3
self.b = 4
def MyMethod(self, a = self.a, b = self.b)
""" My Method
"""
self.a = a
self.b = b
DoSomething(a, b)
The above doesn't work. Is there a way to make it work?
Thanks
This doesn't work because you can't reference keyword arguments in the
keyword argument array. This will work:
class MyClass:
def __init__(self):
""" initialize
Really? These are the worst docstrings ever.
"""
self.a = 3
self.b = 4
def MyMethod(self, a=None, b=None)
if a is not None:
self.a = a
if b is not None:
self.b = b
DoSomething(a, b)
There is an alternative to this None thing:
Don't use optional arguments. Optional arguments are fine ,but I found
myself avoiding using them is often a better choice.
Quoting the zen of python: "Explicit is better than implicit."
If the reason for using optional arguments is that it'll take you 2 sec
less to write the method call, then it sounds kind of wrong. Any other
reason would be valid I guess.
I personnaly use optional arguments only to keep backward compatibility
when changing a method signature.
JM
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