How to Sort a List of Strings Based on Corresponding Integer Values in Another List?

Sorting a List Using Corresponding Values from Another List

Given two lists, X containing strings and Y containing integers, you aim to sort X according to the corresponding values in Y while preserving the original order of elements with the same "key" value. Explore the following optimized solution using Python's built-in functions:

[x for _, x in sorted(zip(Y, X))]

Example:

X = ["a", "b", "c", "d", "e", "f", "g", "h", "i"]
Y = [ 0,   1,   1,    0,   1,   2,   2,   0,   1]

Z = [x for _,x in sorted(zip(Y,X))]
print(Z)  # ["a", "d", "h", "b", "c", "e", "i", "f", "g"]

Explanation:

1. zip(Y, X) creates a list of tuples, each containing an element from Y and the corresponding element from X.
2. sorted(zip(Y, X)) sorts the list of tuples based on the first element (the value from Y).
3. [x for _, x in sorted(...)] creates a new list by iterating over the sorted list of tuples, discarding the first element (_), and keeping only the second element (x).

Further Explanation:

The sorted() function allows you to specify a key function that determines the sorting criteria. In this case, we use key=lambda pair: pair[0] to sort the tuples based on their first element. This effectively sorts X based on the corresponding values in Y.

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