Changes between Version 1 and Version 2 of LambdaSetOperations

Timestamp:

Jan 19, 2010, 12:53:56 PM (10 years ago)

Author:

flip

Comment:

--

LambdaSetOperations

@@ -1 +1 @@
 Lambda operators to perform simple set operators
+
+FYI, Python has a built-in set type which can provide these operations
+for you in a more self-documenting fashion. See examples below.
+
+The Set has only been around since (I think) Python 2.4 so code 
+(and examples) written for older versions of Python might not make use of 
+them.
+
+http://docs.python.org/library/stdtypes.html#set
+
+Examples using filter & lambda:
 
 {{{
@@ -21 +32 @@
 }}}
 
+Examples using Python's built-in set:
+
+{{{ 
+    # Union
+    >>> list1=range(5) # [0,1,2,3,4]
+    >>> list2=range(3,7) # [3,4,5,6]
+    >>> union = set(list1).union(list2)
+    >>> print union
+    set([0, 1, 2, 3, 4, 5, 6])
+    >>> print list(union)
+    [0, 1, 2, 3, 4, 5, 6]
+    
+    # Intersection
+    >>> intersection = set(list1).intersection(list2)
+    >>> print intersection
+    set([3, 4])
+    >>> print list(intersection)
+    [3, 4]
+
+    # Difference
+    >>> difference = set(list1) - set(list2)
+    >>> print difference
+    set([0, 1, 2])
+
+    # Symmetric difference 
+    # Return a new set with elements in either the set or other but not both.
+    >>> symmetric_difference = set(list1).symmetric_difference(list2)
+    >>> print symmetric_difference
+    set([0, 1, 2, 5, 6])
+    >>> 
+
+
+}}}