Add Lab1, Problem1 and Problem2

thinkcspy/Chapter-12-Exercises/Problem2.py

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+def add_fruit(inventory, fruit, quantity=0):
+    
+    if fruit not in inventory:
+        inventory[fruit] = quantity
+    else:
+        inventory[fruit] += quantity
+        
+    return inventory
+
+# make these tests work...
+new_inventory = {}
+print(new_inventory)
+add_fruit(new_inventory, 'strawberries', 10)
+#  test that 'strawberries' in new_inventory
+print(new_inventory.keys())
+#  test that new_inventory['strawberries'] is 10
+print(new_inventory)
+add_fruit(new_inventory, 'strawberries', 25)
+#  test that new_inventory['strawberries'] is now 35)
+print(new_inventory)