Python Functions

Python functions are reusable blocks of code that perform a specific task. They can take input parameters, perform some operations on them, and return output values. Functions are an essential part of Python programming, as they help in modularizing code, reducing code duplication, and improving code readability. In this article, we will explore Python functions in detail, including their syntax, parameters, return values, scope, and recursion. We will also discuss some best practices for writing Python functions and common errors to avoid.

Classification of Python Functions

Built-in Functions:

These are functions that are built into the Python interpreter and are available for use without requiring any additional code or libraries.

Examples include print(), len(), range(), etc.

User-defined Functions:

These are functions that are created by the user to perform specific tasks.

They can be defined using the def keyword and can take input parameters and return output values.

Anonymous Functions (Lambda Functions):

These are small, one-line functions that do not have a name and are typically used in situations where a function is required for a short period of time.

They can be created using the lambda keyword.

Recursive Functions:

These are functions that call themselves within their own definition. They are commonly used in situations where a problem can be divided into smaller sub-problems that can be solved using the same function.

Higher-order Functions:

These are functions that take one or more functions as input parameters or return a function as output. They are commonly used in functional programming and can be used to implement powerful abstractions and algorithms.

Generator Functions:

These are functions that use the yield keyword to produce a sequence of values instead of returning a single value. They can be used to generate large sequences of values efficiently without using up too much memory.

Decorator Functions:

These are functions that modify the behavior of other functions without changing their code. They are typically used to add additional functionality to functions, such as logging, caching, or authentication.

These are some common types of Python functions. Understanding these different types of functions and their usage can help you write more efficient, readable, and maintainable code in Python.

Here are some additional types of Python functions:

Methods:

These are functions that are associated with a particular object and are called using dot notation. Methods can access and modify the object’s data and state. Examples include string methods like upper() and lower().

Class Functions:

These are functions that are associated with a particular class and can be called without creating an instance of the class. Class functions can access and modify class-level data and state. They are defined using the @classmethod decorator.

Static Functions:

These are functions that are associated with a particular class but do not have access to class-level data or state. Static functions are defined using the @staticmethod decorator.

Getter and Setter Functions:

These are functions that are used to get and set the values of an object’s attributes. They are commonly used in object-oriented programming to ensure that attribute values are set and accessed in a consistent and controlled manner.

Coroutines:

These are functions that can be paused and resumed during execution to allow for asynchronous programming. They are defined using the async keyword and use the await keyword to pause and resume execution.

Partial Functions:

These are functions that are created by “freezing” some of the input arguments of a function. The resulting partial function can be called with the remaining arguments to produce the final output. They are commonly used to simplify the use of complex functions with many input arguments.

Understanding these additional types of Python functions can help you write more powerful and flexible code in Python. Each type of function has its own advantages and disadvantages, and choosing the right type of function for a particular task can help you write more efficient, readable, and maintainable code.

How to create User-defined Functions

Syntax to create function in python:

In Python, you can define a function using the def keyword, followed by the function name, a set of parentheses, and a colon. The syntax for defining a function is as follows:

 def function_name(parameters):
    """
    Docstring: This is a description of the function that explains what it does.
    """
    # Function body: This is where you put the code that the function executes.
    # The body can contain one or more statements, and may include a return statement.
    return value # optional

explanation:

The different parts of the syntax:

def: This is the keyword used to define a function.
function_name: This is the name of the function. It should be descriptive and follow the naming conventions for Python identifiers.
parameters: These are the inputs to the function. They are optional and can be one or more values separated by commas. If there are no parameters, you still need to include the parentheses.
:: This is a colon that indicates the start of the function body.
"""docstring""": This is an optional string that describes the function. It is a good practice to include a docstring that explains what the function does and any parameters it takes.
return: This keyword is used to specify the value that the function returns. It’s optional and can be used to return a value from the function. If there is no return statement, the function returns None.

Here’s an example of a simple function that takes two numbers as input and returns their sum:

def add_numbers(x, y):
    """
    This function takes two numbers as input and returns their sum.
    """
    result = x + y
    return result
To call this function, you can simply use its name and pass in the required arguments:
sum = add_numbers(2, 3)
print(sum) # Output: 5

Creating user-defined functions in Python is a straightforward process. Here are the basic steps:

Start by using the def keyword, followed by the name of the function and any input parameters inside parentheses. The function name should be descriptive and meaningful, and follow Python naming conventions (i.e., lowercase with words separated by underscores).
Next, write the code block that performs the desired operation. This code can include any valid Python code, including other functions, loops, conditionals, and variables.
If the function is meant to return a value, use the return keyword followed by the value to be returned. If the function does not return a value, you can omit the return statement.

Here is an example of a simple user-defined function that takes two numbers as input, adds them together, and returns the result:

def add_numbers(num1, num2):
    result = num1 + num2
    return result

 How to call the function ?
To call this function, you can simply use its name and provide the required input arguments:

sum = add_numbers(5, 7)
print(sum) # Output: 12

In this example, we define a function named “add_numbers” that takes two input parameters (num1 and num2), adds them together, and returns the result using the return keyword. We then call the function with the input arguments 5 and 7, and store the result in a variable named “sum”. Finally, we print the result using the print statement.

You can create more complex functions by using additional input parameters, conditional statements, loops, and other programming constructs. Understanding how to create user-defined functions is an essential skill for writing efficient, readable, and maintainable code in Python.

Arguments of function?

In Python, arguments are inputs passed to a function when it is called. They can be used by the function to perform specific tasks or computations. There are four types of arguments that can be used in Python functions:

1-Positional Arguments: These are the most common type of argument and are passed to a function in the order that they are listed in the function definition. For example:

def add_numbers(x, y):
    return x + y

result = add_numbers(5, 7) # 5 is the value of x, and 7 is the value of y

2-Keyword Arguments: These arguments are passed to a function by explicitly stating the parameter name followed by the value. This allows the order of the arguments to be changed and also makes the code more readable.

def greet(name, age):
    print("Hello, my name is", name, "and I am", age, "years old.")

greet(name="Alice", age=25) # explicitly passing arguments by name

Default Arguments: These arguments have a default value assigned in the function definition and are used if no value is provided by the caller. For example:

def say_hello(name="world"):
    print("Hello", name)

say_hello() # prints "Hello world"
say_hello("Alice") # prints "Hello Alice"

4-Variable-length Arguments: These are used when the number of arguments needed by a function may vary. There are two types of variable-length arguments:

a. *args: This is used when an arbitrary number of positional arguments are needed. The values passed are then stored in a tuple. For example:

def add_numbers(*args):
    total = 0
    for num in args:
        total += num
    return total

result = add_numbers(5, 7, 10) # adds all values passed in as positional arguments
b. **kwargs: This is used when an arbitrary number of keyword arguments are needed. The values passed are then stored in a dictionary. For example:

 def print_person_info(**kwargs):
    for key, value in kwargs.items():
        print(key + ":", value)

print_person_info(name="Alice", age=25, city="New York") # prints all key-value pairs passed in as keyword arguments

Number of Arguments

The number of arguments that a function can take in Python is not limited to a specific number. In fact, a function can take zero, one, or any number of arguments as needed. This flexibility is one of the key features of Python functions and allows for great versatility in programming.

There are a few ways to create functions that can take a variable number of arguments:

Positional Arguments: A function can take an arbitrary number of positional arguments by using the special syntax *args in the function definition. For example:

def add_numbers(*args):
    total = 0
    for num in args:
        total += num
    return total

result = add_numbers(1, 2, 3, 4, 5) # result is 15

Keyword Arguments: A function can also take an arbitrary number of keyword arguments by using the special syntax **kwargs in the function definition. For example:

def print_person_info(**kwargs):
    for key, value in kwargs.items():
        print(key + ":", value)

print_person_info(name="Alice", age=25, city="New York")
# Output:
# name: Alice
# age: 25
# city: New York

Combining Positional and Keyword Arguments: A function can also take a combination of positional and keyword arguments. In this case, the positional arguments must come before the keyword arguments. For example:

 def print_info(name, *args, **kwargs):
    print("Name:", name)
    print("Positional Arguments:", args)
    print("Keyword Arguments:", kwargs)

print_info("Alice", 25, "New York", occupation="Engineer", hobbies=["Reading", "Hiking"])
# Output:
# Name: Alice
# Positional Arguments: (25, 'New York')
# Keyword Arguments: {'occupation': 'Engineer', 'hobbies': ['Reading', 'Hiking']}

In the above example, the first argument "name" is a required positional argument, followed by an arbitrary number of positional arguments, and finally an arbitrary number of keyword arguments.

Arbitrary Arguments, *args

In Python, we can use the special syntax *args to pass an arbitrary number of arguments to a function. The *args parameter in the function definition allows us to pass any number of positional arguments to the function, and these arguments are automatically collected into a tuple.

Here’s an example:

def my_sum(*args):
    total = 0
    for num in args:
        total += num
    return total

result = my_sum(1, 2, 3, 4, 5)
print(result)  # Output: 15

In the above example, the my_sum function takes an arbitrary number of arguments using the *args parameter. When we call the my_sum function with five arguments (1, 2, 3, 4, 5), the args parameter becomes a tuple containing all five arguments. We can then loop over the tuple and add up all the numbers to get the total sum.

It’s important to note that the name args is just a convention and you can use any valid variable name in its place. The *args syntax is what tells Python that the function can take an arbitrary number of arguments.

Keyword Arguments

Keyword arguments are a way to pass arguments to a function by specifying the name of the argument along with its value. This allows you to pass arguments in any order, as long as you specify the names of the arguments correctly.

Here’s an example:

def describe_pet(name, animal_type):
    print(f"I have a {animal_type} named {name}.")

describe_pet(name="Max", animal_type="dog")
describe_pet(animal_type="cat", name="Misty")

In the above example, we define a function describe_pet that takes two parameters, name and animal_type. We then call the function twice, once with the arguments in the order they are defined in the function (name first, then animal_type), and once with the arguments in the opposite order.

By specifying the argument names explicitly, we can pass the arguments in any order we like, as long as we use the correct names. This can make function calls more readable and easier to understand, especially when the function takes many arguments.

It’s important to note that when using keyword arguments, the order of the arguments doesn’t matter, but the names of the arguments must be correct. Also, keyword arguments are optional, so if a function defines a keyword argument with a default value, you don’t have to specify it when calling the function.

Arbitrary Keyword Arguments, **kwargs

In addition to arbitrary positional arguments (*args), Python also supports arbitrary keyword arguments using the **kwargs syntax. This allows you to pass a variable number of keyword arguments to a function.

Here’s an example:

def my_function(**kwargs):
    for key, value in kwargs.items():
        print(f"{key}: {value}")

my_function(first_name="John", last_name="Doe", age=30)

In the above example, we define a function my_function that takes arbitrary keyword arguments using the **kwargs parameter. When we call the function with the arguments first_name="John", last_name="Doe", and age=30, these arguments are collected into a dictionary that is passed to the function as the kwargs parameter.

Inside the function, we loop over the items in the kwargs dictionary and print out each key-value pair.

Arbitrary keyword arguments can be useful when you need to pass a variable number of named arguments to a function, such as when writing a wrapper function that calls other functions with different arguments. It’s important to note that the name kwargs is just a convention and you can use any valid variable name in its place. The **kwargs syntax is what tells Python that the function can take an arbitrary number of keyword arguments.

Default Parameter Value

In Python, you can define default values for function parameters. This means that if a caller of the function doesn’t provide a value for a particular parameter, the default value will be used instead.

Here’s an example:

def greet(name, greeting="Hello"):
    print(f"{greeting}, {name}!")

greet("Alice")   # Output: Hello, Alice!
greet("Bob", "Hi")   # Output: Hi, Bob!

In the above example, we define a function greet that takes two parameters, name and greeting. The greeting parameter has a default value of "Hello". When we call the function with only one argument (greet("Alice")), the default value is used for the greeting parameter. When we call the function with two arguments (greet("Bob", "Hi")), the second argument is used for the greeting parameter.

It’s important to note that when using default parameter values, any parameters with default values must come after any parameters without default values. For example, the following function definition is invalid:

def invalid_function(greeting="Hello", name):
    print(f"{greeting}, {name}!")

This is because the name parameter doesn't have a default value, but it comes before the greeting parameter, which does have a default value.

Passing a List as an Argument

In Python, you can pass a list as an argument to a function. The function can then access the elements of the list and manipulate them as needed.

Here’s an example:

def process_numbers(numbers):
    total = sum(numbers)
    average = total / len(numbers)
    print(f"Total: {total}, Average: {average}")

my_numbers = [2, 4, 6, 8, 10]
process_numbers(my_numbers)

In the above example, we define a function process_numbers that takes a list of numbers as its parameter. Inside the function, we calculate the total and average of the numbers using built-in functions, and then print out the results.

We then define a list of numbers my_numbers, and call the process_numbers function with this list as its argument. The function accesses the elements of the list and calculates the total and average.

When passing a list as an argument, it’s important to note that the function can modify the list if it wants to. This is because lists are mutable objects in Python. If you want to prevent the function from modifying the original list, you can create a copy of the list inside the function using the slice operator ([:]) or the list() function.

Return Values

In Python, a function can return a value using the return statement. The value that is returned can be of any data type, such as a string, number, list, or even another function.

Here’s an example:

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

total = add_numbers(3, 5)
print(total)   # Output: 8

In the above example, we define a function add_numbers that takes two parameters, a and b. Inside the function, we add the two parameters together and store the result in a variable result. We then use the return statement to return the value of result.

We then call the add_numbers function with the arguments 3 and 5, and store the returned value in a variable total. We print out the value of total, which should be 8.

It’s important to note that a function can return only one value. If you need to return multiple values, you can do so by returning a tuple or a list. For example:

def get_name_and_age():
    name = "Alice"
    age = 30
    return (name, age)

result = get_name_and_age()
print(result[0])   # Output: Alice
print(result[1])   # Output: 30

In this example, the get_name_and_age function returns a tuple containing two values, name and age. We then store the returned tuple in a variable result. We can access the individual values in the tuple using indexing.

The pass Statement

In Python, the pass statement is a null operation. It is used when you need a statement in your code that does nothing. It can be useful as a placeholder when you are working on code and want to leave a statement empty for the time being.

Here’s an example:

def do_nothing():
    pass

In the above example, we define a function do_nothing that does nothing. We simply use the pass statement as a placeholder in the body of the function.

The pass statement can also be used as a placeholder in loops, conditional statements, and other control flow statements. For example:

for i in range(10):
    if i % 2 == 0:
        pass
    else:
        print(i)

In this example, we use the pass statement as a placeholder in the if statement. If i is even, we do nothing (pass), and if i is odd, we print it out.

Overall, the pass statement is a useful tool for when you need to include a statement that does nothing in your code, either as a placeholder or to structure your code.

Recursion

Recursion is a programming technique in which a function calls itself one or more times to solve a problem. It’s a powerful and elegant way to solve problems that can be broken down into smaller subproblems.

Here’s an example of a recursive function in Python that calculates the factorial of a number:

def factorial(n):
    if n == 0:
        return 1
    else:
        return n * factorial(n - 1)

In this example, the factorial function takes a single argument, n, which represents the number we want to calculate the factorial of. If n is 0, we return 1 (since 0! = 1). Otherwise, we return n multiplied by the factorial of n-1. This is the recursive part of the function: it calls itself with a smaller value of n until n reaches 0.

Let’s say we want to calculate the factorial of 5. We call the factorial function with an argument of 5. The function calculates 5 times the factorial of 4, which is 4 times the factorial of 3, and so on, until it reaches 0. At that point, the function returns 1, and the recursive calls start to unwind. The final result is the product of all the numbers from 1 to 5, which is 120.

Recursion can be a very powerful tool for solving certain types of problems, but it’s important to be careful when using it. Recursive functions can consume a lot of memory if they’re not designed properly, and they can also be difficult to debug. However, when used correctly, recursion can lead to elegant and efficient solutions to complex problems.

Examples to create Functions

Here are some more examples of user-defined functions in Python:

A function that calculates the area of a rectangle:

def rectangle_area(length, width):
    area = length * width
    return area

A function that checks if a number is even:

 def is_even(number):
    if number % 2 == 0:
        return True
    else:
        return False

A function that calculates the factorial of a number:

def factorial(n):
    if n == 0:
        return 1
    else:
        return n * factorial(n - 1)

A function that returns the maximum value from a list of numbers:

def max_value(numbers):
    max_val = numbers[0]
    for num in numbers:
        if num > max_val:
            max_val = num
    return max_val

A function that converts a temperature from Fahrenheit to Celsius:

def fahrenheit_to_celsius(fahrenheit):
    celsius = (fahrenheit - 32) * 5 / 9
    return celsius
 These are just a few examples of the many types of user-defined functions that can be created in Python. 
By breaking down complex tasks into smaller, reusable functions, you can write more efficient, readable, and maintainable code.

A function that calculates the average of a list of numbers:

def average(numbers):
    total = sum(numbers)
    count = len(numbers)
    return total / count

A function that removes duplicates from a list:

def remove_duplicates(items):
    unique_items = []
    for item in items:
        if item not in unique_items:
            unique_items.append(item)
    return unique_items

A function that checks if a string is a palindrome:

def is_palindrome(string):
    reversed_string = string[::-1]
    if string == reversed_string:
        return True
    else:
        return False

A function that calculates the nth Fibonacci number:

def fibonacci(n):
    if n == 0:
        return 0
    elif n == 1:
        return 1
    else:
        return fibonacci(n-1) + fibonacci(n-2)

A function that sorts a list of strings in alphabetical order:

 def sort_strings(strings):
    sorted_strings = sorted(strings)
    return sorted_strings

These are just a few more examples of the many types of user-defined functions that can be created in Python. 
By breaking down complex tasks into smaller, reusable functions, you can write more efficient, readable, and maintainable code.

A function that finds the square root of a number:

 def square_root(number):
    return number ** 0.5

A function that calculates the area of a circle:

def circle_area(radius):
    return 3.14159 * radius ** 2

A function that converts a string to title case:

def title_case(string):
    words = string.split()
    title_words = []
    for word in words:
        title_word = word[0].upper() + word[1:].lower()
        title_words.append(title_word)
    return ' '.join(title_words)

A function that reverses a string:

def reverse_string(string):
    return string[::-1]

A function that calculates the sum of the first n natural numbers:

def sum_of_naturals(n):
    return sum(range(1, n+1))

These are just a few more examples of the many types of user-defined functions that can be created in Python. 
By breaking down complex tasks into smaller, reusable functions, you can write more efficient, readable, and maintainable code.

A function that calculates the factorial of a number using a loop:

def factorial(n):
    result = 1
    for i in range(1, n+1):
        result *= i
    return result

A function that checks if a string is a pangram (contains all the letters of the alphabet):

def is_pangram(string):
    alphabet = 'abcdefghijklmnopqrstuvwxyz'
    for letter in alphabet:
        if letter not in string.lower():
            return False
    return True

A function that calculates the greatest common divisor of two numbers using the Euclidean algorithm:

 def gcd(a, b):
    while b:
        a, b = b, a % b
    return a

A function that removes all vowels from a string:

 def remove_vowels(string):
    vowels = 'aeiouAEIOU'
    return ''.join([char for char in string if char not in vowels])

A function that calculates the sum of the digits of a number:

def sum_of_digits(number):
    digits = [int(digit) for digit in str(number)]
    return sum(digits)

A function that sorts a list of numbers in descending order:

def sort_descending(numbers):
    return sorted(numbers, reverse=True)

A function that counts the number of words in a string:

def word_count(string):
    words = string.split()
    return len(words)

A function that checks if a number is prime:

def is_prime(number):
    if number < 2:
        return False
    for i in range(2, int(number**0.5)+1):
        if number % i == 0:
            return False
    return True

A function that finds the minimum and maximum numbers in a list:

 def min_max(numbers):
    minimum = min(numbers)
    maximum = max(numbers)
    return minimum, maximum

A function that calculates the distance between two points in 2D space:

def distance(x1, y1, x2, y2):
    return ((x2 - x1)**2 + (y2 - y1)**2) ** 0.5

These are just a few more examples of the many types of user-defined functions that can be created in Python. By breaking down complex tasks into smaller, reusable functions, you can write more efficient, readable, and maintainable code.

A function that returns the Fibonacci sequence up to a given number:

def fibonacci(n):
    fib = [0, 1]
    while fib[-1] < n:
        fib.append(fib[-1] + fib[-2])
    return fib[:-1]

A function that removes duplicates from a list:

 def remove_duplicates(lst):
    return list(set(lst))

A function that converts a decimal number to binary:

def decimal_to_binary(n):
    binary = ''
    while n > 0:
        binary = str(n % 2) + binary
        n //= 2
    return binary

A function that generates a random password:

 import random
import string

def generate_password(length):
    chars = string.ascii_letters + string.digits + string.punctuation
    password = ''.join(random.choice(chars) for _ in range(length))
    return password

A function that calculates the area of a triangle:

def triangle_area(base, height):
    return 0.5 * base * height
These are just a few more examples of the many types of user-defined functions that can be created in Python.
 By breaking down complex tasks into smaller, reusable functions, you can write more efficient, readable, and maintainable code.

A function that checks if a given string is a palindrome:

 def is_palindrome(string):
    return string == string[::-1]

A function that calculates the sum of the first n natural numbers:

def sum_of_n(n):
    return (n * (n+1)) // 2

A function that capitalizes the first letter of each word in a string:

def capitalize_words(string):
    words = string.split()
    capitalized = [word.capitalize() for word in words]
    return ' '.join(capitalized)

A function that converts a temperature from Celsius to Fahrenheit:

def celsius_to_fahrenheit(celsius):
    return (celsius * 1.8) + 32

A function that calculates the area of a circle:

 def circle_area(radius):
    return 3.14159 * radius**2    

These are just a few more examples of the many types of user-defined functions that can be created in Python. By breaking down complex tasks into smaller, reusable functions, you can write more efficient, readable, and maintainable code.

A function that capitalizes the first letter of each word in a string:

 def capitalize_words(string):
    words = string.split()
    capitalized = [word.capitalize() for word in words]
    return ' '.join(capitalized)

These are just a few more examples of the many types of user-defined functions that can be created in Python. By breaking down complex tasks into smaller, reusable functions, you can write more efficient, readable, and maintainable code.

Quiz about user-defined functions in Python

here’s a multiple choice quiz about user-defined functions in Python:

What is a user-defined function in Python? a) A function that is built-in to Python b) A function that is defined by the user c) A function that is defined by the Python standard library

Answer: b) A function that is defined by the user

What is the syntax for defining a function in Python? a) def function_name(): b) def function_name(parameters): c) def function_name(arguments):

Answer: b) def function_name(parameters):

What is the purpose of a return statement in a function? a) To stop the execution of the function b) To specify the arguments of the function c) To return a value from the function

Answer: c) To return a value from the function

What is a parameter in a function? a) The value returned by the function b) A variable used to store the result of the function c) A variable used to pass data into the function

Answer: c) A variable used to pass data into the function

What is the purpose of a docstring in a function? a) To provide documentation about the function b) To specify the arguments of the function c) To return a value from the function

Answer: a) To provide documentation about the function

Can a function call another function? a) Yes b) No

Answer: a) Yes

What is recursion in Python? a) A type of function that calls itself b) A type of function that calls another function c) A built-in function in Python

Answer: a) A type of function that calls itself

What is the purpose of a default argument in a function? a) To specify the arguments of the function b) To provide a default value for an argument c) To return a value from the function

Answer: b) To provide a default value for an argument

What is the purpose of a lambda function in Python? a) To define a named function b) To define an anonymous function c) To define a function with default arguments

Answer: b) To define an anonymous function

What is the difference between a tuple and a list in Python? a) A tuple is mutable, while a list is immutable b) A tuple is indexed from 1, while a list is indexed from 0 c) A tuple is immutable, while a list is mutable

Answer: c) A tuple is immutable, while a list is mutable

here are some more multiple choice questions about user-defined functions in Python:

What is a function call in Python? a) A statement that defines a function b) A statement that executes a function c) A statement that comments on a function

Answer: b) A statement that executes a function

What is the difference between a global variable and a local variable in Python? a) A global variable is defined inside a function, while a local variable is defined outside a function b) A global variable is accessible from anywhere in the code, while a local variable is only accessible inside a function c) A global variable is immutable, while a local variable is mutable

Answer: b) A global variable is accessible from anywhere in the code, while a local variable is only accessible inside a function

What is a variable scope in Python? a) The area of the code where a variable can be accessed b) The area of the code where a variable cannot be accessed c) The area of the code where a function is defined

Answer: a) The area of the code where a variable can be accessed

What is the purpose of the keyword “pass” in Python? a) To terminate a loop or a function b) To define an empty function or class c) To define a default argument in a function

Answer: b) To define an empty function or class

What is a function signature in Python? a) The name and return type of a function b) The name and parameters of a function c) The name and body of a function

Answer: b) The name and parameters of a function

What is a recursive function in Python? a) A function that calls another function b) A function that is defined inside another function c) A function that calls itself

Answer: c) A function that calls itself

What is the purpose of a module in Python? a) To provide a container for functions and variables b) To define classes and objects c

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Python course

Curriculum

Python Functions

Python Functions

Classification of Python Functions

Built-in Functions:

User-defined Functions:

Anonymous Functions (Lambda Functions):

Recursive Functions:

Higher-order Functions:

Generator Functions:

Decorator Functions:

Here are some additional types of Python functions:

Class Functions:

Static Functions:

Getter and Setter Functions:

Coroutines:

Partial Functions:

How to create User-defined Functions

Syntax to create function in python:

Arguments of function?

Number of Arguments

Arbitrary Arguments, *args

Keyword Arguments

Arbitrary Keyword Arguments, **kwargs

Default Parameter Value

Passing a List as an Argument

Return Values

The pass Statement

Recursion

Examples to create Functions

Quiz about user-defined functions in Python

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