Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to iterate through a dictionary in Python?
Dictionaries are a valuable and frequently used data structure in Python. This article tells us how to traverse through a dictionary while performing operations on its key-value pairs.
Using dict.items() Method
Python's dict.items() method allows you to loop through the dictionary. Each repetition will provide you with both the key and value of each item.
Example
Following is an example to iterate through a dictionary using dict.items() method −
dictionary = { 'Novel': 'Pride and Prejudice', 'year': '1813', 'author': 'Jane Austen', 'character': 'Elizabeth Bennet' } for keys, values in dictionary.items(): print(keys ,values)
Output
Following is an output of the above code.
Novel Pride and Prejudice year 1813 author Jane Austen character Elizabeth Bennet
Using Keys() Method
To iterate through the dictionary's keys, utilise the keys() method that is supplied by the dictionary. An iterable of the keys available in the dictionary is returned. Then, as seen below, you can cycle through the keys using a for loop.
Example - 1
Following is an example to iterate through a dictionary using keys() method −
dictionary = { 'Novel': 'Pride and Prejudice', 'year': '1813', 'author': 'Jane Austen', 'character': 'Elizabeth Bennet' } for keys in dictionary.keys(): print(keys)
Output
Following is an output of the above code:.
Novel year author character
Example - 2
If you want to get the values of the keys during each iteration, you can use the get() method, as it is demonstrated below −
dictionary = { 'Novel': 'Pride and Prejudice', 'year': '1813', 'author': 'Jane Austen', 'character': 'Elizabeth Bennet' } for keys in dictionary.keys(): print(dictionary.get(keys))
Output
Following is an output of the above code.
Pride and Prejudice 1813 Jane Austen Elizabeth Bennet
Using Values() Method
To iterate through the values of the dictionary elements, utilise the values() method that the dictionary provides.
An iterable of all the values for each item that is available in the dictionary is returned. You can then go through the numbers as shown below by using a for loop.
Example
This approach prevents access to the dictionary keys(), which is typically not required. As a result, iterating through the dictionary using this way is the quickest method.
The items() method offered by the Python dictionary allows you to loop through the dictionary entries.
Following is an example to iterate through a dictionary using values() method −
dictionary = { 'Novel': 'Pride and Prejudice', 'year': '1813', 'author': 'Jane Austen', 'character': 'Elizabeth Bennet' } for values in dictionary.values(): print(values)
Output
Following is an output of the above code −
Pride and Prejudice 1813 Jane Austen Elizabeth Bennet
Iterating with Index
The items' index can be used to iterate across the dictionary.Iterating the dictionary without utilising the methods keys(), values(), or items is similar to this.
Example
Following is an example to iterate through a dictionary with index −
dictionary = { 'Novel': 'Pride and Prejudice', 'year': '1813', 'author': 'Jane Austen', 'character': 'Elizabeth Bennet' } for index in dictionary: print(index, dictionary[index])
Output
Following is an output of the above code.
Novel Pride and Prejudice year 1813 author Jane Austen character Elizabeth Bennet
Iterating Over Dictionary In Alphabetical Order
Ordinarily, dictionaries don't keep any sort of order. This implies that the iteration's order of the items is not guaranteed. The sorted() function in Python can be used to iterate a dictionary using a given order. The item will be sorted first, after which a for loop can traverse over it.
Example
sorted(dictionary.keys()) sorts the dictionary's keys and for iterates through the keys that the sorted function returned.
Following is an example to iterate through a dictionary with index −
dictionary = { 'Novel': 'Pride and Prejudice', 'year': '1813', 'author': 'Jane Austen', 'character': 'Elizabeth Bennet' } for keys in sorted(dictionary.keys()): print(keys, dictionary[keys])
Output
Following is an output of the above code.
Novel Pride and Prejudice author Jane Austen character Elizabeth Bennet year 1813
Sort Using Dictionary Item Values
You must first generate a sorted set of keys before you can sort the dictionary according to its values.
The sorted keys set can then be iterated, with each iteration allowing you to access the dictionary using the key.
Example
A set of sorted keys is produced using sorted keys = sorted(dictionary,key=dictionary.get).
in sorted keys for values: - repeats the set of sorted keys
sorted_dictionary[values] = dictionary[values]–To the sorted dictionary, access the dictionary and add the value. Now, the sorted values will be present in the final dictionary. To verify the outcomes, print it.
Following is an example to sort using dictionary item values −
dictionary = { 'Novel': 'Pride and Prejudice', 'year': '1813', 'author': 'Jane Austen', 'character': 'Elizabeth Bennet' } sorted_dictionary = {} sorted_key = sorted(dictionary, key=dictionary.get) for values in sorted_key: sorted_dictionary[values] = dictionary[values] print(sorted_dictionary)
Output
Following is an output of the above code −
{'year': '1813', 'character': 'Elizabeth Bennet', 'author': 'Jane Austen', 'Novel': 'Pride and Prejudice'}
10K+ Views
To Continue Learning Please Login