Overload item getter operator
Overload __getitem__
__getitem__(self, key) returns the value corresponding to the given key. For a sequence, the key should be an integer from zero to n-1 or, it could be negative, where n is the length of the sequence.
For a mapping, you could really have any kind of keys.
For a sequence, if the key is a negative integer, it should be used to count from the end.
In other words, treat x[-n] the same as x[len(x)-n].
class MyList:# www. ja v a 2 s . c o m
def __init__(self, start):
self.wrapped = [] # Make sure it's a list here.
for x in start: self.wrapped.append(x)
def __add__(self, other):
return MyList(self.wrapped + other)
def __mul__(self, time):
return MyList(self.wrapped * time)
def __getitem__(self, offset):
return self.wrapped[offset]
def __len__(self):
return len(self.wrapped)
def __getslice__(self, low, high):
return MyList(self.wrapped[low:high])
def append(self, node):
self.wrapped.append(node)
def __getattr__(self, name): # Other members: sort/reverse/etc
return getattr(self.wrapped, name)
def __repr__(self):
return self.wrapped
x = MyList('spam')
print x
print x[0]
print x[1:]
print x + ['eggs']
print x * 3
x.append('a')
x.sort( )
for c in x: print c,
The code above generates the following result.
