What is an example of built-in and user-defined functions in Python?

Categories Python

In Python, there are both built-in functions that are provided by the language itself and user-defined functions that are created by the users. Here are some examples of both:

  1. Built-in Functions:
    • print(): Used to output text or variables to the console.
    • len(): Returns the length of a string, list, or other iterable.
    • type(): Returns the type of an object.
    • input(): Takes input from the user through the console.
    • range(): Generates a sequence of numbers.
    • sum(): Calculates the sum of a sequence of numbers.
  2. User-defined Functions:
def greet(name):
    print("Hello, " + name + "!")

def add_numbers(a, b):
    return a + b

def multiply_list(numbers):
    result = 1
    for num in numbers:
        result *= num
    return result
Code language: Python (python)
  1. In the examples above:
    • The greet() function takes a name as an argument and prints a greeting message.
    • The add_numbers() function takes two numbers as arguments and returns their sum.
    • The multiply_list() function takes a list of numbers as an argument and returns their product.

These are just a few examples, and both built-in and user-defined functions can be used in various ways to perform different tasks in Python.

What are the most commonly used built-in functions in Python?

Python provides a wide range of built-in functions that are commonly used in everyday programming tasks. Here are some of the most commonly used built-in functions in Python:

  1. print(): Used to output text or variables to the console.
  2. input(): Takes input from the user through the console.
  3. len(): Returns the length of a string, list, tuple, or other iterable.
  4. type(): Returns the type of an object.
  5. range(): Generates a sequence of numbers.
  6. sum(): Calculates the sum of a sequence of numbers.
  7. max(): Returns the maximum value from a sequence.
  8. min(): Returns the minimum value from a sequence.
  9. abs(): Returns the absolute value of a number.
  10. round(): Rounds a number to a specified number of decimal places.
  11. sorted(): Returns a new sorted list from an iterable.
  12. str(): Converts an object into a string representation.
  13. int(): Converts a string or a number into an integer.
  14. float(): Converts a string or a number into a floating-point number.
  15. list(): Converts an iterable into a list.
  16. dict(): Creates a new dictionary.
  17. set(): Creates a new set.
  18. enumerate(): Returns an iterator that yields pairs of elements and their indices.
  19. zip(): Combines multiple iterables into a single iterable of tuples.
  20. help(): Displays the documentation and help information for objects, modules, or keywords.

These are just a few examples of the commonly used built-in functions in Python. There are many more functions available in the Python standard library that can be used for a wide range of tasks.

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