python for loop with dictionary
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Python is a versatile programming language known for its simplicity and readability. One of the powerful features of Python is its ability to iterate over various data structures efficiently. In this tutorial, we will focus on using the for loop with dictionaries, a common and useful data structure in Python.
A dictionary in Python is an unordered collection of key-value pairs. Each key must be unique, and it is associated with a specific value. Dictionaries are defined using curly braces {}, and the key-value pairs are separated by colons :. Here is a simple example:
The simplest way to iterate over a dictionary is to loop through its keys using the for loop. Here's an example:
This loop prints each key in the dictionary on a new line. In our example, it will output:
If you want to iterate over the values of the dictionary, you can use the values() method:
This loop prints each value in the dictionary on a new line. The output for our example would be:
To iterate over both keys and values simultaneously, you can use the items() method:
This loop prints each key-value pair in the dictionary on a new line, formatted as key: value. The output would be:
You can use a for loop to modify the values of a dictionary. For instance, let's increment the age of each person in the dictionary by 1:
After this loop, the dictionary will be modified, and the output would be:
The for loop in Python is a powerful tool for iterating over dictionaries. Whether you need to process keys, values, or key-value pairs, Python's for loop provides a convenient and readable solution. Experiment with these examples to deepen your understanding of iterating over dictionaries in Python.
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