How to Loop over a Sequence in Reverse

You may sometimes need to loop over a sequence in reverse. To this end you can use the reversed function. Here’s a list of planets. We’re going to print all the elements of the list in their original order and then in reversed order:

planets = ["Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune"]
print("Planets from nearest to farthest from the Sun:")

for planet in planets:
    print(planet)

print()
print("Planets from farthest to nearest from the Sun:")

for planet in reversed(planets):
    print(planet)

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Here’s the result:

Planets from nearest to farthest from the Sun:
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune

Planets from farthest to nearest from the Sun:
Neptune
Uranus
Saturn
Jupiter
Mars
Earth
Venus
Mercury

As you can see, it’s pretty simple and straightforward.

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