Python list.reverse Method: Usage and Examples

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What You Need to Understand

list.reverse() reverses the elements of an existing list in place and returns None. This differs from the iterator returned by reversed(list).

When to Use It

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Step-by-Step Python Example

events = ["opened", "edited", "saved"]
result = events.reverse()
print(events)
print(result)

How the Example Works

The original list becomes reversed; result is None because reverse() mutates the list.

Example Output

['saved', 'edited', 'opened']
None
[3, 2, 1]
[1, 2, 3]

A Second Example

Compare this smaller variation with the main example, then experiment with your own values.

events = [1, 2, 3]
print(list(reversed(events)))
print(events)

Important Behavior and Edge Cases

Do not assign events = events.reverse(). Use events[::-1] or list(reversed(events)) if you need an independent reversed list.

Try It Yourself

Create a reversed copy without changing the source list.

Common Beginner Mistakes

• Do not assign events = events.reverse(). Use events[::-1] or list(reversed(events)) if you need an independent reversed list.
• Using the wrong collection method for this operation without checking whether it mutates the object, returns a result, or raises on missing data.

Key Takeaways

• list.reverse() reverses the elements of an existing list in place and returns None.
• The original list becomes reversed; result is None because reverse() mutates the list.
• Do not assign events = events.reverse().