Just another update

Task/Symmetric-difference/Python/symmetric-difference-1.py

@@ -6,4 +6,7 @@
 {'Serena'}
 >>> setB - setA # elements in B that are not in A
 {'Jim'}
->>>
+>>> setA | setB # elements in A or B (union)
+{'John', 'Bob', 'Jim', 'Serena', 'Mary'}
+>>> setA & setB # elements in both A and B (intersection)
+{'Bob', 'John', 'Mary'}

Task/Symmetric-difference/Python/symmetric-difference-2.py

@@ -4,5 +4,4 @@
 set(['Jim', 'Serena'])
 >>> setA - setB # elements in A that are not in B
 set(['Serena'])
->>> setB - setA # elements in B that are not in A
-set(['Jim'])
+>>> # and so on...

Task/Symmetric-difference/Python/symmetric-difference-3.py

@@ -0,0 +1,10 @@
+>>> setA.symmetric_difference(setB)
+{'Jim', 'Serena'}
+>>> setA.difference(setB)
+{'Serena'}
+>>> setB.difference(setA)
+{'Jim'}
+>>> setA.union(setB)
+{'Jim', 'Mary', 'Serena', 'John', 'Bob'}
+>>> setA.intersection(setB)
+{'Mary', 'John', 'Bob'}