Resolve Issue #40: Python 2 print statements changed to use Python 3 print function (#50)

* Update 01_selection_sort.py

Updated last print statement for Python 3 print function.

* Update 01_countdown.py

Updated print statement to print function for Python 3.

* Update 05_quicksort.py

Updated print statement to print function for Python 3.

* Update 01_price_of_groceries.py

Condensed dictionary creation into one line, edited print statement to a print function for Python 3.

* Update 01_set_covering.py

Changed print statement to print function for Python 3.

* Update 01_binary_search.py

Changed print statements to print function for Python 3.

05_hash_tables/python/01_price_of_groceries.py

@@ -1,7 +1,2 @@
-book = dict()
-# an apple costs 67 cents
-book["apple"] = 0.67
-# milk costs $1.49
-book["milk"] = 1.49
-book["avocado"] = 1.49
-print book
+book = {"apple": 0.67, "milk": 1.49, "avocado": 1.49}
+print(book)