How to Efficiently Verify List Sorting in Python?

Pythonic Approach to Sort Verification

When working with lists of values, it is often crucial to determine if the elements are sorted either in ascending or descending order. Python programmers seek a concise and idiomatic way to perform this check.

Using a Generator Expression

A Pythonic approach involves using a generator expression paired with the built-in all() function. For a list of timestamps listtimestamps, the following code snippet checks for sorting in ascending order:

<code class="python">all(l[i] <= l[i+1] for i in range(len(l) - 1))

This generator expression compares each element l[i] with its successor l[i 1]. If all comparisons evaluate to True, indicating a non-decreasing order, the all() function returns True. Otherwise, it returns False.

Customizing the Sort Order

To check for descending order, simply replace <= with >= in the generator expression:

<code class="python">all(l[i] >= l[i+1] for i in range(len(l) - 1))</code>

By utilizing this concise approach, you can effortlessly verify the sortedness of a list in the desired order, ensuring that timestamps appear in the correct chronological sequence.

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