"Nitin Das" <nitin....@gmail.com> wrote
class mymut(object):
def __setattr__(self,k,v):
if hasattr(self,k):
if self.__dict__.get(k) == None:
self.__dict__[k] = v
Do you need to look up the dict?
Surely you could just use
if self.k is None
self.k = v
which looks a lot simpler to me...
else:
raise TypeError("Cant Modify Attribute Value")
You could mention the class for example.
Compare it with the string and tuple messages:
'fred'[2] = 'g'
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'str' object does not support item assignment
(1,2,30)[1] = 5
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'tuple' object does not support item assignment
So if your error said
TypeError: mymut object does not support item assignment
that would be more consistent with the Python internal objects.
else:
raise TypeError("Immutable Object")
The Python immutables seem to raise an Attribute Error here
rather than a Type error. And again mentioning the class name
makes debugging easier:
'l'.x = 4
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'str' object has no attribute 'x'
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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