I am constructing a simple class to make sure I understand how classes
work in Python (see below this paragraph).
It works as expected, except the __add__ redefinition. I get the
following in the Python interpreter:
>>> a=myListSub()
>>> a
[]
>>> a+[5]
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: 'str' object is not callable
>>>
Please could you let me know where I am going wrong. I have hacked
around with the code and tried googling this error message but am
having difficulty finding the source of the problem.
Many thanks
Jon
class myList:
def __init__ (self,value=[]):
self.wrapped=[]
for x in value :
self.wrapped.append(x)
def __repr__ (self):
return `self.wrapped`
def __getattr__ (self,attrib):
return getattr(self.wrapped,attrib,'attribute not found')
def __len__ (self):
return len(self.wrapped)
def __getitem__ (self,k):
return self.wrapped[k]
def __add__(self,other):
return self.wrapped+other
class myListSub(myList):
classCounter=0
def __init__ (self,value=[]):
self.instanceCounter=0
myList.__init__(self,value)
def __add__(self,other):
myListSub.classCounter=myListSub.classCounter+1
self.instanceCounter=self.instanceCounter+1
myList.__add__(self,other)
def getCounters (self):
return "classCounter=%s instanceCounter=%s" %
(myListSub.classCounter,self.classCounter)
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