Introduction to Python functions: usage and examples of sorted function

Introduction to Python functions: Usage and examples of sorted function

Python has many built-in functions, one of which is a very commonly used function is the sorted() function. The sorted() function is used to sort an iterable object and return a new sorted list. This article will introduce the usage of the sorted() function and provide some specific code examples.

1. Basic usage of sorted() function
   The basic syntax of sorted() function is as follows:
   sorted(iterable, key, reverse)
   Among them, iterable is to be sorted Iterable object; key is an optional parameter used for sorting, and reverse is a Boolean parameter used to control the sorting order.
2. Sort in default order
   The sorted() function sorts in ascending order by default. The following is a sample code that demonstrates how to sort a list named numbers:

numbers = [3, 1, 4, 2, 5]
sorted_numbers = sorted(numbers)
print(sorted_numbers)

The output result is: [1, 2, 3, 4, 5]. As you can see, the sorted() function sorts the elements of the list numbers in ascending order.

3. Sort in the specified order
   In addition to the default ascending sort, the sorted() function also allows you to specify other sorting orders. You can pass a function through the key parameter to specify the collation. The following is a sample code that demonstrates how to sort by the absolute value of elements:

numbers = [3, -1, 4, -2, 5]
sorted_numbers = sorted(numbers, key=abs)
print(sorted_numbers)

The output result is: [-1, 2, 3, 4, 5]. As you can see, the sorted() function sorts the elements according to their absolute value.

4. Sort in descending order
   If you need to sort in descending order, you can set the reverse parameter to True. The following is a sample code that demonstrates how to sort a list named numbers in descending order:

numbers = [3, 1, 4, 2, 5]
sorted_numbers = sorted(numbers, reverse=True)
print(sorted_numbers)

The output result is: [5, 4, 3, 2, 1]. As you can see, the sorted() function sorts the elements of the list numbers in descending order.

5. Sort strings
   In addition to sorting numbers, the sorted() function can also be used to sort strings. The following is a sample code that demonstrates how to sort strings in a list named names:

names = ['David', 'Alice', 'Bob', 'Charlie']
sorted_names = sorted(names)
print(sorted_names)

The output is: ['Alice', 'Bob', 'Charlie', ' David']. As you can see, the sorted() function sorts the strings in the list names in alphabetical order.

Summary:
This article introduces the basic usage and examples of the sorted() function. You can customize the sorting rules by specifying the key parameter, and control the sorting order by setting the reverse parameter. The sorted() function is one of the very useful functions in Python, providing a concise and effective solution for sorting iterable objects. Whether you are sorting numbers or strings, the sorted() function can do the job. I hope this article will help you understand and apply the sorted() function!

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