how to loop through a dictionary in python

1a_dict = {'color': 'blue', 'fruit': 'apple', 'pet': 'dog'}
2for key, value in a_dict.items():
3  print(key, '->', value)

1dictionary = {52:"E",126:"A",134:"B",188:"C",189:"D"}
2for key, value in dictionary.items():
3	print(key)
4	print(value)

1a_dict = {'apple':'red', 'grass':'green', 'sky':'blue'}
2for key in a_dict:
3  print key # for the keys
4  print a_dict[key] # for the values

1#iterate the dict by keys
2for key in a_dict:
3	print(key)
4#iterate the dict by items - (key,value)
5for item in a_dict.items():
6    print(item)
7#iterate the dict by values
8for value in a_dict.values():
9    print(value)

1new_list = [something(key, value) for key, value in a_dict.items()]

1>>> a_dict = {'color': 'blue', 'fruit': 'apple', 'pet': 'dog'}
2>>> for key in a_dict:
3...     print(key)
4...
5color
6fruit
7pet
8