On 8/31/2011 1:12 PM, Prasad, Ramit wrote:
def double(obj): return 2*obj.value
class C:
def __init__(self, val):
>> self.value = val
c = C(3)
>> C.double = double
>> c.doub = double
>> # not c.double as that would mask access to C.double in c.double()
>> print(double(c),
C.double(c), c.double(), c.doub(c))
Above is 3.2 code. To be exactly equivalent with 2.x, you need
class C(object):
Sorry if I get some of the following terminology wrong, I get a bit
confused on Python terms. I hope the following is still coherent. (Is
there a dictionary of Python terminology?)
Given the above example I get this
print c.double(c)
TypeError: double() takes exactly 1 argument (2 given)
Right, because c.double() translates to C.double(c), and c.double(x)
translates to C.double(c,x), which is not valid.
print c.doub(c)
6
It seems to me that if I add a function to the list of class
attributes it will automatically wrap with "self"
When accessed via an instance of the class, the instance is
automagically added as the first argument to be bound to the first
parameter. The name 'self' is a convention, not a requirement.
but adding it to
the object directly will not wrap the function as a method. Can
somebody explain why?
Someone else did. Not wrapping is normal, wrapping is a special case.
--
Terry Jan Reedy
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