How to access the key-value pairs in a dictionary using Python?

1 year ago
Jackson Davis
2 minutes

In Python, there are several methods that can be used to retrieve a dictionary’s key-value pairs.

  1. list of keys
my_dict = {"a": 1, "b": 2, "c": 3}
keys = my_dict.keys()
print(keys)  # 输出：dict_keys(['a', 'b', 'c'])

Note: the keys() method returns an iterable object, which needs to be converted into a list using the list() function.

  1. retrieve all the values from a collection
my_dict = {"a": 1, "b": 2, "c": 3}
values = my_dict.values()
print(values)  # 输出：dict_values([1, 2, 3])

Note: the values() method also returns an iterable object.

  1. List of objects
my_dict = {"a": 1, "b": 2, "c": 3}
items = my_dict.items()
print(items)  # 输出：dict_items([('a', 1), ('b', 2), ('c', 3)])

Note: the items() method returns an iterable object containing key-value pairs, where each pair is represented as a tuple.

  1. Iterate through key-value pairs in a dictionary using a loop.
my_dict = {"a": 1, "b": 2, "c": 3}
for key, value in my_dict.items():
    print(key, value)

Output:

a 1
b 2
c 3

In a loop, you can assign keys and values to variables using destructuring assignment.

In summary, there are several ways to access the key-value pairs of a dictionary: use the keys() method to get keys, use the values() method to get values, use the items() method to get key-value pairs, or iterate through the dictionary’s key-value pairs.

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