Add tuple and set.

Author: hermite2053

data_structures/set/set_example.py

@@ -0,0 +1,8 @@
+colors = {'white', 'black', 'red', 'blue', 'yellow', 'white', 'red'}
+print(colors) # duplicates have been removed.
+
+# testing
+t = 'black' in colors
+print(t)
+t = 'pink' in colors
+print(t)

data_structures/set/set_operation.py

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+s = set('abcdabcde')
+t = set('qazqazw')
+e = set() # empty set
+
+print(s)
+print(t)
+print(e)
+
+print(s | t)
+print(s & t)
+print(s - t)
+print(s ^ t)

data_structures/tuple/tuple.py

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+t1 = 10, 20, 30, 40 # separate by commas to make tuple.
+
+print(t1[0]) # also index can be used.
+print(t1) # tuple should be printed with `()`.
+
+t2 = t1, (100, 200) # nesting
+print(t2)
+print(t2[0])
+#t2[0][1] = 0 # tuples are immutable