added game inventory

Author: copev313

game_inventory.py

@@ -0,0 +1,69 @@
+# game_inventory.py
+
+# We demonstrate some ways to display, add and remove
+# items from a player's inventory in a fantasy game.
+
+
+def display_inventory(inventory={}):
+    print('\n- - - - - - - - - -')
+    print('INVENTORY: \n')          # Print title
+    count = 0                       # Initialize counter variable
+    
+    if (inventory != {}):           # CASE: Nonempty Inventory
+        for key, val in inventory.items():
+            count += val
+            if (val > 1):   key += 's'          # Handle plurals
+            
+            as_string = '{num} {name}'.format(num=val, name=key)
+            print(as_string)
+    else:                           # CASE: Empty Inventory
+        print('  (empty)  ')
+    
+    weight_msg = '  (Things are getting pretty heavy.)' if (count > 400) else ''   # Conditional weight comment.
+    print("\nTotal number of items: " + str(count) + weight_msg)            # Always print the total.
+    print('\n- - - - - - - - - -\n\n')
+
+
+
+def add_items(inventory={}, add_list=[]):
+    if (add_list != []):            # CASE: Nonempty list
+        for item in add_list:       # Iterate through each item in the list
+            if item not in inventory.keys():       ## CASE: New type of item
+                inventory[item] = 1
+            else:                                  ## CASE: Item of this type already exist.
+                inventory[item] += 1
+                
+    else:   pass                    # CASE: Empty list
+
+
+
+def remove_items(inventory={}, remove_list=[]):
+    if (remove_list != []):                # CASE: Nonempty list
+        for item in remove_list:        # Iterate through each item in the list
+            if item not in inventory.keys():        ## CASE: No such item in the inventory.
+                continue
+            else:                                   ## CASE: Item of this type exists, and one was removed.
+                inventory[item] -= 1
+                if (inventory[item] == 0):          # Delete items with zero inventory.
+                    del inventory[item]
+                    
+    else:   pass                        # CASE: Empty list
+
+
+
+# SOME TESTS COMMENTED BELOW:
+'''
+empty = {}
+basic = {   'rope': 1, 'arrow': 12, 'gold coin': 25, 'fire stick': 5, 'dagger': 1  }
+advanced = {     'rope': 8, 'arrow': 42, 'gold coin': 312, 'fire stick': 18, 'dagger': 11, 'helmet': 5, 
+            'glove': 7, 'shield potion': 11, 'health potion': 7, 'elixir': 2, 'orb of confusion': 1,
+            'label maker': 1, 'label': 4, 'cookie': 5  }
+
+display_inventory(empty)
+add_items(empty, ['rope', 'gold coin', 'twig', 'dirt', 'pebble', 'gold coin', 'gold coin'])
+display_inventory(empty)
+
+display_inventory(advanced)
+remove_items(advanced, ['rope', 'arrow', 'arrow', 'label', 'health potion', 'arrow', 'fire stick', 'cookie'])
+display_inventory(advanced)
+'''