What is the usage of items() method in Python dictionaries?

1 year ago
Liam
1 minute

In Python dictionaries, the method items() is used to return a view of all the key-value pairs in the dictionary. Specifically, it returns a list of tuples, where each tuple contains a key from the dictionary and its corresponding value.

The usage of this method is as follows:

dictionary.items()

示例：解释一下这个观点。- Please explain this point.

student = {'name': 'Alice', 'age': 18, 'grade': 'A'}
items = student.items()
print(items)

Output:

dict_items([('name', 'Alice'), ('age', 18), ('grade', 'A')])

In the example above, the items() method returns a dictionary view called dict_items, which contains all the key-value pairs in the dictionary student. It is important to note that dictionary views are dynamic and will update accordingly when the dictionary changes.

You can use a for loop to iterate through all key-value pairs in a dictionary.

student = {'name': 'Alice', 'age': 18, 'grade': 'A'}
for key, value in student.items():
    print(key, ':', value)

Output:

name : Alice
age : 18
grade : A

In the example above, we use a for loop to iterate through all key-value pairs in the dictionary ‘student’, assigning the key to variable ‘key’ and the value to variable ‘value’, then printing them out.

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