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Python Source  |  2010-05-29  |  3.6 KB  |  89 lines
  1. """A more or less complete user-defined wrapper around list objects."""
  2.  
  3. import collections
  4.  
  5. class UserList(collections.MutableSequence):
  6.     def __init__(self, initlist=None):
  7.         self.data = []
  8.         if initlist is not None:
  9.             # XXX should this accept an arbitrary sequence?
  10.             if type(initlist) == type(self.data):
  11.                 self.data[:] = initlist
  12.             elif isinstance(initlist, UserList):
  13.                 self.data[:] = initlist.data[:]
  14.             else:
  15.                 self.data = list(initlist)
  16.     def __repr__(self): return repr(self.data)
  17.     def __lt__(self, other): return self.data <  self.__cast(other)
  18.     def __le__(self, other): return self.data <= self.__cast(other)
  19.     def __eq__(self, other): return self.data == self.__cast(other)
  20.     def __ne__(self, other): return self.data != self.__cast(other)
  21.     def __gt__(self, other): return self.data >  self.__cast(other)
  22.     def __ge__(self, other): return self.data >= self.__cast(other)
  23.     def __cast(self, other):
  24.         if isinstance(other, UserList): return other.data
  25.         else: return other
  26.     def __cmp__(self, other):
  27.         return cmp(self.data, self.__cast(other))
  28.     __hash__ = None # Mutable sequence, so not hashable
  29.     def __contains__(self, item): return item in self.data
  30.     def __len__(self): return len(self.data)
  31.     def __getitem__(self, i): return self.data[i]
  32.     def __setitem__(self, i, item): self.data[i] = item
  33.     def __delitem__(self, i): del self.data[i]
  34.     def __getslice__(self, i, j):
  35.         i = max(i, 0); j = max(j, 0)
  36.         return self.__class__(self.data[i:j])
  37.     def __setslice__(self, i, j, other):
  38.         i = max(i, 0); j = max(j, 0)
  39.         if isinstance(other, UserList):
  40.             self.data[i:j] = other.data
  41.         elif isinstance(other, type(self.data)):
  42.             self.data[i:j] = other
  43.         else:
  44.             self.data[i:j] = list(other)
  45.     def __delslice__(self, i, j):
  46.         i = max(i, 0); j = max(j, 0)
  47.         del self.data[i:j]
  48.     def __add__(self, other):
  49.         if isinstance(other, UserList):
  50.             return self.__class__(self.data + other.data)
  51.         elif isinstance(other, type(self.data)):
  52.             return self.__class__(self.data + other)
  53.         else:
  54.             return self.__class__(self.data + list(other))
  55.     def __radd__(self, other):
  56.         if isinstance(other, UserList):
  57.             return self.__class__(other.data + self.data)
  58.         elif isinstance(other, type(self.data)):
  59.             return self.__class__(other + self.data)
  60.         else:
  61.             return self.__class__(list(other) + self.data)
  62.     def __iadd__(self, other):
  63.         if isinstance(other, UserList):
  64.             self.data += other.data
  65.         elif isinstance(other, type(self.data)):
  66.             self.data += other
  67.         else:
  68.             self.data += list(other)
  69.         return self
  70.     def __mul__(self, n):
  71.         return self.__class__(self.data*n)
  72.     __rmul__ = __mul__
  73.     def __imul__(self, n):
  74.         self.data *= n
  75.         return self
  76.     def append(self, item): self.data.append(item)
  77.     def insert(self, i, item): self.data.insert(i, item)
  78.     def pop(self, i=-1): return self.data.pop(i)
  79.     def remove(self, item): self.data.remove(item)
  80.     def count(self, item): return self.data.count(item)
  81.     def index(self, item, *args): return self.data.index(item, *args)
  82.     def reverse(self): self.data.reverse()
  83.     def sort(self, *args, **kwds): self.data.sort(*args, **kwds)
  84.     def extend(self, other):
  85.         if isinstance(other, UserList):
  86.             self.data.extend(other.data)
  87.         else:
  88.             self.data.extend(other)
  89.