Initial data commit

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

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+>>> setA = {"John", "Bob", "Mary", "Serena"}
+>>> setB = {"Jim", "Mary", "John", "Bob"}
+>>> setA ^ setB # symmetric difference of A and B
+{'Jim', 'Serena'}
+>>> setA - setB # elements in A that are not in B
+{'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'}