How Can I Iterate Through Adjacent Item Pairs in a Python List?

Iterating over Adjacent Item Pairs in a Python List

Python offers a convenient approach to traverse a list and access adjacent item pairs. This is particularly useful when working with sequences or data that need to be analyzed in pairs.

To iterate through adjacent pairs of items in a list using a for loop, consider the following example:

a = [5, 7, 11, 4, 5]

for previous, current in zip(a, a[1:]):
    print(previous, current)

In this code, we utilize the zip() function to align the elements of the list a with its own copy sans the first element, which is denoted by a[1:]. This creates a series of tuples, each containing two adjacent elements from the original list.

The for loop iterates over these tuples, assigning the current element to the variable previous and the subsequent element to the variable current. It then prints the pair of values, resulting in the following output:

5 7
7 11
11 4
4 5

This method proves effective even when the list a contains no elements or only a single element, ensuring that the code remains robust and adaptable to various scenarios.

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