


How Do I Iterate Through Python Dictionaries Using 'For' Loops and Access Both Keys and Values?
Dec 23, 2024 am 03:18 AMIterating Through Dictionaries Using 'For' Loops
When iterating over dictionaries in Python using a 'for' loop, it may seem like the loop is only accessing the keys. This can raise the question of whether 'key' is a special keyword in the context of dictionaries.
Key as a Variable
In reality, 'key' is simply a variable name assigned to the loop iterator. The loop structure:
for key in d:
iterates over the keys in the dictionary 'd'. This is because the loop variable 'key' is placed within an object that automatically extracts the keys from the dictionary.
Iterating Over Keys and Values
To iterate over both keys and values in a dictionary, you can use the following syntax:
Python 3.x and Above:
for key, value in d.items():
Python 2.x:
for key, value in d.iteritems():
The above structures create a loop where 'key' and 'value' are assigned to the key and value of each dictionary entry, respectively.
Additional Notes:
- In Python 3.x, 'iteritems()' was replaced with 'items()', which provides a more advanced view of the dictionary.
- The 'items()' function returns a set-like view of the dictionary keys and values.
- In Python 2.x, 'iteritems()' returns a list of key-value pairs, which may not reflect subsequent changes to the dictionary.
The above is the detailed content of How Do I Iterate Through Python Dictionaries Using 'For' Loops and Access Both Keys and Values?. For more information, please follow other related articles on the PHP Chinese website!

Hot tools Tags

Hot Article

Hot tools Tags

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

How Do I Use Beautiful Soup to Parse HTML?

How to Use Python to Find the Zipf Distribution of a Text File

How to Work With PDF Documents Using Python

Intro to Flask: Adding a Contact Page

How to Cache Using Redis in Django Applications

How to Perform Deep Learning with TensorFlow or PyTorch?
