Here are a few title options, keeping in mind the question format and the content of your article: Short and Direct: * How to Check for Sublist Presence in Python? * Does a Sublist Exist in Python?

Checking for Sublist Presence in Python

Determining if a sublist exists within a larger list is a common programming task. Python provides several methods to achieve this, but one particularly useful approach involves utilizing list slicing and a custom function.

Let's consider the following example:

<code class="python">list1 = [1,0,1,1,1,0,0]
list2 = [1,0,1,0,1,0,1]</code>

Our goal is to create a function sublistExists(list1, sublist) that returns True if sublist is present in list1 and False otherwise.

The contains_sublist() function below leverages list slicing to perform this check:

<code class="python">def contains_sublist(lst, sublst):
    n = len(sublst)
    return any((sublst == lst[i:i+n]) for i in range(len(lst)-n+1))</code>

This function works by iterating through lst and checking if any slice of length n (the length of sublst) is equal to sublst. It employs the any() function to stop as soon as a match is found, resulting in an efficient O(m * n) time complexity, where m and n are the lengths of lst and sublst, respectively.

Example Usage:

<code class="python">sublistExists(list1, [1,1,1])  # True
sublistExists(list2, [1,1,1])  # False</code>

By implementing this custom function, we can easily check for the presence of a sublist within a larger list in Python.

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