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Python - Built-in Functions

Built-in functions are those functions that are pre-defined in the Python interpreter and you don't need to import any module to use them. These functions help to perform a wide variety of operations on strings, iterators, and numbers. For instance, the built-in functions like sum(), min(), and max() are used to simplify mathematical operations.

To use built-in functions in your code, simply call the specific function by passing the required parameter (if any) inside the parentheses. Since these functions are pre-defined, you don't need to import any module or package.

Consider the following example demonstrating the use of built-in functions in your code:

# Using print() and len() function

text = "Tutorials Point"

print(len(text)) # Prints 15

In the above example, we are using two built-in functions print() and len().

As of Python 3.12.2 version, the list of built-in functions is given below −

There are some additional built-in functions that are used for performing only mathematical operations in Python, they are listed below −

1

Python abs() function

The abs() function returns the absolute value of x, i.e. the positive distance between x and zero.

2

Python max() function

The max() function returns the largest of its arguments or largest number from the iterable (list or tuple).

3

Python min() function

The function min() returns the smallest of its arguments i.e. the value closest to negative infinity, or smallest number from the iterable (list or tuple)

4

Python pow() function

The pow() function returns x raised to y. It is equivalent to x**y. The function has third optional argument mod. If given, it returns (x**y) % mod value

5

Python round() Function

round() is a built-in function in Python. It returns x rounded to n digits from the decimal point.

6

Python sum() function

The sum() function returns the sum of all numeric items in any iterable (list or tuple). An optional start argument is 0 by default. If given, the numbers in the list are added to start value.

The following are the advantages of using built-in functions:

• The use of the built-in functions simplifies and reduces the code length and enhances the readability of the code.
• Instead of writing the same logic repeatedly, you can use these functions across different sections of the program. This not only saves time but also helps in maintaining consistency of code.
• These functions provide a wide range of functionalities including mathematical operations, datatype conversion, and performing operations on iterators.
• These functions have descriptive names that make the code easier to understand and maintain. Developers need not write additional complex code for performing certain operations.

While working with built-in functions, you may encounter errors and to handle those errors you can use the try-except blocks. This may help you identify the type of error and exceptions raised.

Yes, we can extend the functionality of built-in functions by using it with other methods and by applying your logic as per the need. However, it will not affect the pre-defined feature of the used function.

No, you cannot create your built-in function. But, Python allows a user to create user-defined functions.

Using a built-in function is very simple, call it by its name followed by parentheses, and pass the required arguments inside the parentheses.

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