Sorting a list by another list in Python
Normally, when we sort a list, we do it in ascending or descending order. However, we can sort a list based on the order of another list in Python.
We will learn how to sort a given list based on the values in another list in this article.
Use the zip()and sorted()functions to sort a list based on another list in Python
In this method, we will use zip()the function to create a third object by combining two given lists, the first one must be sorted and the second one depends on the sorting.
We can then use sorted()the function, which extracts the first element of each pair of given lists from the sorted and zipped list.
A = ["r", "s", "t", "u", "v", "w", "x", "y", "z"]
B = [0, 1, 1, 0, 1, 2, 2, 0, 1]
result_list = [i for _, i in sorted(zip(B, A))]
print(result_list)
Output:
['r', 'u', 'y', 's', 't', 'v', 'z', 'w', 'x']
NumPySort a list based on another list in Python
using the list_sort module
In this method, we convert the list into NumPyan array and then apply the sorting algorithm to the list. We use argsort()the function to sort the array on which the sorting depends and then use these values to filter the second array.
Refer to the following example.
import numpy
A = ["r", "s", "t", "u", "v", "w", "x", "y", "z"]
B = [0, 1, 1, 0, 1, 2, 2, 0, 1]
A = numpy.array(A)
B = numpy.array(B)
inds = B.argsort()
sorted_a = A[B]
print(sorted_a)
Output:
['r' 's' 's' 'r' 's' 't' 't' 'r' 's']
To get the final data in a list, use tolist()the function.
more_itertools.sort_togetherSorting a list according to another list in Python
using
more_itertoolsThe module is itertoolsan extension of the module. sort_togetherThe function returns the input iterables sorted together, taking key_listthe list in the argument as the sorting priority.
For example,
from more_itertools import sort_together
X = ["r", "s", "t", "u", "v", "w", "x", "y", "z"]
Y = [0, 1, 1, 0, 1, 2, 2, 0, 1]
s = sort_together([Y, X])[1]
print(list(s))
Output:
['r', 'u', 'y', 's', 't', 'v', 'z', 'w', 'x']
We need to use list()the function to get the final result in list form.
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