Functions, Parameters, and Return Values

0
9χλμ.

In Python, functions are reusable blocks of code that perform specific tasks. They promote code modularity, readability, and maintainability. Here's a breakdown of their key aspects:

Functions:

  • Defined using the def keyword followed by the function name and parentheses.
  • Can optionally take arguments (parameters) within the parentheses, which are used as inputs for the function.
  • May or may return a value using the return statement. This value becomes the output of the function call.

Syntax:

Python
def function_name(parameters):
  """Function docstring (optional)"""
  # Function body (code to be executed)
  # ...
  return value  # Optional return statement

Example:

Python
def greet(name):
  """Greets the user by name."""
  message = f"Hello, {name}!"
  return message

greeting = greet("Alice")  # Call the function with an argument
print(greeting)  # Output: Hello, Alice!

Parameters:

  • Function parameters act like placeholders that receive values when the function is called.
  • You can define multiple parameters separated by commas.
  • Parameters can have default values assigned within the function definition, which are used if no argument is provided during the call.

Example:

Python
def calculate_area(length, width=10):  # Width has a default value
  """Calculates the area of a rectangle."""
  area = length * width
  return area

area_1 = calculate_area(5)  # Use default width (10)
area_2 = calculate_area(3, 7)  # Provide both arguments

print(area_1)  # Output: 50
print(area_2)  # Output: 21

Return Values:

  • The return statement is used to specify the value the function sends back after its execution.
  • A function can optionally return a value using return. If no return statement is present, the function implicitly returns None.
  • The returned value can be any valid Python data type (e.g., integers, strings, lists, etc.).

Key Points:

  • Functions help in organizing code and improving reusability.
  • Parameters allow you to customize the function's behavior during each call.
  • Return values provide a way for functions to send data back to the calling code.
Αναζήτηση
Κατηγορίες
Διαβάζω περισσότερα
Technology
History of Python and Computer Hardware
As computer programming started to get popular and evolve in the 1960’s and 70’s,...
από Python for Everybody - Full University Python Course Code 2024-07-16 20:52:57 0 11χλμ.
Εκπαίδευση
The Legacy of Ellis Island
από Modern American History 2024-08-02 16:43:07 0 10χλμ.
Technology
Importance of Cyber Laws
Cyber laws, also known as internet laws or digital laws, are essential for regulating activities...
από ALAGAI AUGUSTEN 2024-07-16 17:07:21 0 9χλμ.
Business
Tips and Tricks of Business Automation
Automation drives innovation, addressing the needs of various industries. Choosing intelligent...
από ALAGAI AUGUSTEN 2024-07-20 18:37:16 0 11χλμ.
Computer Programming
Basic structure of an HTML document
An HTML document is composed of two main sections: the head and the body. The <head>...
από HTML PROGRAMMING LANGUAGE 2024-08-13 03:25:34 0 8χλμ.
Tebtalks https://tebtalks.com