The items() method of the dictionary is a very useful tool that helps us quickly iterate through all the key-value pairs in the dictionary.
A dictionary in Python is an unordered data type that is used to store key-value pairs. List of high-quality authors
The items() method of a dictionary is a built-in method that can be used to fetch all key-value pairs in a dictionary and return them as a list.
This article will provide a comprehensive introduction to the usage, examples, and precautions of the items() method in the dictionary to help readers better understand and use this method.
Basic usage. The dictionary's items() method returns a view object that contains all key-value pairs in the dictionary.
This view object is similar to a list and can be traversed.
Example**: Create a dictionary My Dict = Fetch all key-value pairs in the dictionary using the items() method items list = list(my dict.).items())print(items list) output: [('name', 'alice'), 'age', 25), 'city', 'new york')]
Traversing key-value pairs.
The items() method makes it easy to iterate through all key-value pairs in the dictionary. During traversal, we can use tuple unwrapping to get the keys and values respectively.
Example**: Create a dictionary My Dict = Traverse all key-value pairs in the dictionary using the items() method and a for for key, value in my dictitems():print(f'key: ,value: ') output: key: name, value: alice output: key: age, value: 25 output: key: city, value: new york
Precautions. When using the items() method of a dictionary, pay attention to the following points:
The items() method returns a view object with key-value pairs in a dictionary, not a list. While it is possible to convert it to a list via the list() function, you need to be aware of the performance overhead. Dictionaries are unordered data types, when using the items() method to traverse a dictionary, the order of the returned key-value pairs may be different in different versions of python or in different implementations, if you need to maintain the order of insertion, you can use the ordereddict class. During traversal, you can use tuple unwrapping to get keys and values, respectively. You can also use the enumerate() function to get the key, value, and corresponding index at the same time. In addition to the items() method, dictionaries have other useful methods, such as keys(), values(), and get(). You can choose the appropriate method to manipulate the dictionary according to your specific needs. Summary.
The items() method of a dictionary is a very useful tool that helps us quickly iterate through all the key-value pairs in the dictionary.
Hopefully, this article will help readers quickly grasp the items() method of the dictionary.