What are Functions in Python? (Definition & Syntax) - Python Tutorial for Beginners
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🖥️ What are Functions in Python? Definition & Syntax for Beginners
Function in Python is a group of related statements, that performs a specific task. Each function helps break your program into pieces of smaller and modular chunks. As your program grows larger and larger, functions in Python make it more organized. Furthermore, functions avoid repetition, make the code reusable and allow you to work collaboratively.
That's True! Functions are the first step to code reuse. They allow you to define a reusable block of code, that can be used, repeatedly in your program. Actually, Python provides several built-in functions, such as: print(), len() or type(). But, you can also define your own functions to use within your programs in Python.
○ Syntax of Function in Python
The basic definition of a Function in Python is as follows:
1. Keyword def, that marks the start of the function header.
2. Function name, to uniquely identify the function throughout your program.
3. Optional parameters (arguments), through which you pass values to a function.
4. Colon (:), to mark the end of the function header.
5. Optional documentation string (docstring) to describe what the function does.
6. One or more valid Python statements in the function body, with the same indentation level - usually 4 spaces.
7. Optional return statement, to return a value from the function.
○ Example of a Function in Python
def hello(name):
"""
This function greets to
the person passed in as
a parameter
"""
print(f"Hello, {name}. Keep watching!")
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