'''
20210927

R. Dawes

Dictionaries in Python - Part 1
'''


# create a dictionary and store some key : value pairs
animals = { 'Hudson' : 'dog', 
                  'Lindor':'cat', 
                  'Gus':'sloth', 
                  'Ed':'horse', 
                  'Praxiteles': 'turtle', 
                  'Rupert':'canary', 
                  'Silver': 'dog'}

print(animals)

print("\nLength of 'animals' dictionary:",len(animals))

print('\n')
# iterate through the keys in the dictionary
for pet in animals:
   print(pet, 'is a', animals[pet])
   
print('\n')
# identify the type
if type(animals) is dict:
   print("It's a dictionary")
else:
   print("It's not")
   
print('\n')   
# add a new key and value
animals['Nemo'] = 'clownfish'

for pet in animals:
   print(pet, 'is a', animals[pet])
   
print('\n')   
# check to see if a key is in the dictionary
pet_name = "Simon"

if pet_name in animals:
   print (pet_name,"is a", animals[pet_name])
else:
   print(pet_name, 'is unknown')

print('\n') 
# get a 'list' of the keys
animals_names = animals.keys()
print("'animals' key values:",animals_names)

print('\n')
# convert the key list into a normal list
animals_names_list = list(animals_names)
print(animals_names_list)
print(animals_names_list[3])
print(animals[animals_names_list[3]])

print('\n')
# remove a key : value pair from the dictionary
print("Removing 'Ed' from the dictionary")
del animals['Ed']
if 'Ed' not in animals:
   print('Ed is gone.')
else:
   print('Ed is still there')
   
print('\n')
# iterate through the key : value pairs  (not just the keys)
for k, v in iter(animals.items()):
   if v == 'dog':
      print(k,'is a dog')