How Can I Iterate Through a Python List in Reverse Order?

Reversed Lists: Iterating Backward in Python

Reversing a list can be a useful operation in Python. To iterate over a list in reverse order, you have two options:

1. Get a Reversed Copy:

To create a new list that is the reverse of the original, use the reversed() function. This function takes a list as input and returns a reverse iterator. To convert it into a new list, simply collect the items using list().

xs = [0, 10, 20, 40]
reversed_list = list(reversed(xs))  # [40, 20, 10, 0]

2. Iterate Backward:

To iterate through a list backwards, you can use reversed() as an iterator. This allows you to loop over the elements in reverse order.

xs = [0, 10, 20, 40]
for x in reversed(xs):
    print(x)
# Output:
# 40
# 20
# 10
# 0

Note that using reversed() does not modify the original list. It creates a new iterator or list that is reversed. This helps maintain the immutability of the original list.

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