Move UserList to collections.

Lib/collections.py

@@ -162,6 +162,80 @@ class UserDict(MutableMapping):
 
 
 
+################################################################################
+### UserList
+################################################################################
+
+class UserList(MutableSequence):
+    """A more or less complete user-defined wrapper around list objects."""
+    def __init__(self, initlist=None):
+        self.data = []
+        if initlist is not None:
+            # XXX should this accept an arbitrary sequence?
+            if type(initlist) == type(self.data):
+                self.data[:] = initlist
+            elif isinstance(initlist, UserList):
+                self.data[:] = initlist.data[:]
+            else:
+                self.data = list(initlist)
+    def __repr__(self): return repr(self.data)
+    def __lt__(self, other): return self.data <  self.__cast(other)
+    def __le__(self, other): return self.data <= self.__cast(other)
+    def __eq__(self, other): return self.data == self.__cast(other)
+    def __ne__(self, other): return self.data != self.__cast(other)
+    def __gt__(self, other): return self.data >  self.__cast(other)
+    def __ge__(self, other): return self.data >= self.__cast(other)
+    def __cast(self, other):
+        return other.data if isinstance(other, UserList) else other
+    def __cmp__(self, other):
+        return cmp(self.data, self.__cast(other))
+    def __contains__(self, item): return item in self.data
+    def __len__(self): return len(self.data)
+    def __getitem__(self, i): return self.data[i]
+    def __setitem__(self, i, item): self.data[i] = item
+    def __delitem__(self, i): del self.data[i]
+    def __add__(self, other):
+        if isinstance(other, UserList):
+            return self.__class__(self.data + other.data)
+        elif isinstance(other, type(self.data)):
+            return self.__class__(self.data + other)
+        return self.__class__(self.data + list(other))
+    def __radd__(self, other):
+        if isinstance(other, UserList):
+            return self.__class__(other.data + self.data)
+        elif isinstance(other, type(self.data)):
+            return self.__class__(other + self.data)
+        return self.__class__(list(other) + self.data)
+    def __iadd__(self, other):
+        if isinstance(other, UserList):
+            self.data += other.data
+        elif isinstance(other, type(self.data)):
+            self.data += other
+        else:
+            self.data += list(other)
+        return self
+    def __mul__(self, n):
+        return self.__class__(self.data*n)
+    __rmul__ = __mul__
+    def __imul__(self, n):
+        self.data *= n
+        return self
+    def append(self, item): self.data.append(item)
+    def insert(self, i, item): self.data.insert(i, item)
+    def pop(self, i=-1): return self.data.pop(i)
+    def remove(self, item): self.data.remove(item)
+    def count(self, item): return self.data.count(item)
+    def index(self, item, *args): return self.data.index(item, *args)
+    def reverse(self): self.data.reverse()
+    def sort(self, *args, **kwds): self.data.sort(*args, **kwds)
+    def extend(self, other):
+        if isinstance(other, UserList):
+            self.data.extend(other.data)
+        else:
+            self.data.extend(other)
+
+
+
 ################################################################################
 ### Simple tests
 ################################################################################