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Python Basics: Functions
Functions in Python serve the dual purpose of enhancing code readability and promoting reusability. Each function encapsulates specific logic, facilitating easier debugging processes.
Below is a basic Python program demonstrating the use of functions:
# Declaring Global Variables
a = 50
b = 20
def add(): # Defining a function named 'add'
add_result = a + b # Defining logic for addition
print(add_result) # Printing the result of addition
def sub(): # Defining a function named 'sub'
sub_result = a - b # Defining logic for subtraction
print(sub_result) # Printing the result of subtraction
def mul(): # Defining a function named 'mul'
mul_result = a * b # Defining logic for multiplication
print(mul_result) # Printing the result of multiplication
If we execute the above code, no output will be printed.
In this Python script, to execute the defined functions, we need to call them explicitly.
Declaring Global Variables
# Declaring Global Variables
a = 50
b = 20
def add(): # Define function named 'add'
result = a + b # Define logic
print(result) # Output the result
def sub(): # Define function named 'sub'
result = a - b # Define logic
print(result) # Output the result
def mul(): # Define function named 'mul'
result = a * b # Define logic
print(result) # Output the result
add() # Call add function
sub() # Call sub function
mul() # Call mul function
When we run this script, it will explicitly call each function (add(), sub(), mul()) in sequence, producing the respective outputs.
When we want to assign specific values to each function instead of relying on global variables, we can define parameters for each function.
def add(a, b): # Define function named 'add' with parameters 'a' and 'b'
result = a + b # Define logic
return result # Return the output
def sub(a, b): # Define function named 'sub' with parameters 'a' and 'b'
result = a - b # Define logic
return result # Return the output
def mul(a, b): # Define function named 'mul' with parameters 'a' and 'b'
result = a * b # Define logic
return result # Return the output
print(add(5, 6)) # Call add function with values 5 and 6 and print the result
print(sub(18, 7)) # Call sub function with values 18 and 7 and print the result
print(mul(5, 8)) # Call mul function with values 5 and 8 and print the result
In this script, each function (add(), sub(), mul()) accepts two parameters (a and b) representing the values to be operated on. When we call each function with specific values, it returns the respective outputs.
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