Here are a few question-based article titles that fit your provided text: * **How to Iterate Over a Circular List in Python, Starting with the Last Visited Element?** * **Circular List Iteration: Usi

Circular List Iteration in Python

In Python, iterating over a circular list in a manner that ensures starting with the last visited item can be easily achieved using the itertools.cycle function. This function is designed specifically for iterating over a sequence infinitely.

Implementation:

To use itertools.cycle, simply pass your circular list as an argument to the function:

<code class="python">from itertools import cycle

lst = ['a', 'b', 'c']

pool = cycle(lst)</code>

Iteration:

The pool variable now represents a circular iterator. You can iterate over it as many times as needed, always starting with the last visited element:

<code class="python">for item in pool:
    print(item)</code>

Output:

a
b
c
a
b
c
...

(The loop will continue indefinitely.)

Manual Advance:

If you want to manually advance the iterator and retrieve values one by one, you can simply call the next() function on the pool variable:

<code class="python">next(pool)  # Returns 'a'
next(pool)  # Returns 'b'</code>

This approach provides a straightforward and efficient way to iterate over circular lists in Python, ensuring that you always begin with the last visited item.

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