How to Sort a List with One Key in Reverse Order and the Other Case-Insensitively in Python?

Sorting a List with One Key in Reverse Order and the Other Case Insensitively

Python provides various methods for sorting lists, including sorting by multiple keys. However, the standard sorting functions may not always provide the desired flexibility.

Consider a list containing tuples with multiple elements, such as [(ele1A, ele2A), (ele1B, ele2B), (ele1C, ele2C)]. To sort this list based on two keys, one in ascending order and the other in descending order, while also ensuring case insensitivity in one key, you need to employ a slightly customized sorting approach.

Python's sorted() function allows you to specify a custom sorting key through a lambda function. By utilizing this feature, you can sort the list as follows:

<code class="python"># Sort by the first key in ascending order and the second key in descending order
sortedList = sorted(myList, key = lambda y: (y[0].lower(), -y[1]))

# Or, sort by the first key in descending order and the second key in ascending order
sortedList = sorted(myList, key = lambda y: (-y[0].lower(), y[1]))

# Or, sort by both keys in descending order
sortedList = sorted(myList, key = lambda y: (-y[0].lower(), -y[1]))</code>

By negating the value of the second key (-y[1]) in the lambda function, you effectively sort it in reverse order. Additionally, you use lower() on the first key to ensure case insensitivity while performing the sorting.

This approach allows you to flexibly sort your list based on complex criteria, enabling you to handle specific sorting requirements effectively.

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