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.

01_introduction_to_algorithms/python/01_binary_search.py

@@ -22,7 +22,7 @@ def binary_search(list, item):
   return None
 
 my_list = [1, 3, 5, 7, 9]
-print binary_search(my_list, 3) # => 1
+print(binary_search(my_list, 3)) # => 1
 
 # 'None' means nil in Python. We use to indicate that the item wasn't found.
-print binary_search(my_list, -1) # => None
+print(binary_search(my_list, -1)) # => None

02_selection_sort/python/01_selection_sort.py

@@ -19,4 +19,4 @@ def selectionSort(arr):
       newArr.append(arr.pop(smallest))
   return newArr
 
-print selectionSort([5, 3, 6, 2, 10])
+print(selectionSort([5, 3, 6, 2, 10]))

03_recursion/python/01_countdown.py

@@ -1,5 +1,5 @@
 def countdown(i):
-  print i
+  print(i)
   # base case
   if i <= 0:
     return

04_quicksort/python/05_quicksort.py

@@ -11,4 +11,4 @@ def quicksort(array):
     greater = [i for i in array[1:] if i > pivot]
     return quicksort(less) + [pivot] + quicksort(greater)
 
-print quicksort([10, 5, 2, 3])
+print(quicksort([10, 5, 2, 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)

08_greedy_algorithms/python/01_set_covering.py

@@ -22,4 +22,4 @@ while states_needed:
   states_needed -= states_covered
   final_stations.add(best_station)
 
-print final_stations
+print(final_stations)