Coding Question Functions in Python

Coding Question Functions in Python

1. Basic Function Practice

a. is_even(): Check if a number is even

def is_even(number):
    return number % 2 == 0

# Example usage:
print(is_even(4))  # Output: True
print(is_even(7))  # Output: False

b. factorial(): Calculate the factorial using a loop

def factorial(n):
    result = 1
    for i in range(2, n + 1):
        result *= i
    return result

# Example usage:
print(factorial(5))  # Output: 120
print(factorial(0))  # Output: 1

2. Function Arguments

a. greet_user(): Greeting with keyword arguments

def greet_user(first_name, last_name):
    print(f"Hello, {first_name} {last_name}!")

# Example usage with keyword arguments:
greet_user(first_name="John", last_name="Doe")
# Output: Hello, John Doe!

b. calculate_area(): Calculate the area of a circle with a default argument

def calculate_area(radius, pi=3.14159):
    return pi * radius * radius

# Example usage:
print(calculate_area(5))        # Output: 78.53975
print(calculate_area(5, 3.14))  # Output: 78.5 (using a different value of pi)

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3. Working with Return Values

a. find_max(): Find the maximum value in a list

def find_max(numbers):
    if not numbers:
        return None
    max_value = numbers[0]
    for number in numbers:
        if number > max_value:
            max_value = number
    return max_value

# Example usage:
print(find_max([1, 2, 3, 4, 5]))  # Output: 5
print(find_max([-10, -20, -30]))  # Output: -10

b. reverse_string(): Reverse a string

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

# Example usage:
print(reverse_string("hello"))  # Output: "olleh"
print(reverse_string("world"))  # Output: "dlrow"

4. Lambda Functions

a. List of squares using map()

squares = list(map(lambda x: x ** 2, range(1, 11)))

# Example usage:
print(squares)  # Output: [1, 4, 9, 16, 25, 36, 49, 64, 81, 100]

b. Filter words shorter than 5 characters using filter()

words = ["apple", "banana", "pear", "kiwi", "grape"]
long_words = list(filter(lambda word: len(word) >= 5, words))

# Example usage:
print(long_words)  # Output: ['apple', 'banana']

5. Advanced Lambda Usage

a. reduce(): Find the product of all elements in a list

from functools import reduce

numbers = [1, 2, 3, 4, 5]
product = reduce(lambda x, y: x * y, numbers)

# Example usage:
print(product)  # Output: 120

b. Combine map() and filter(): Squares of even numbers from 1 to 20

squares_of_even_numbers = list(map(lambda x: x ** 2, filter(lambda x: x % 2 == 0, range(1, 21))))

# Example usage:
print(squares_of_even_numbers)  # Output: [4, 16, 36, 64, 100, 144, 196, 256, 324, 400]

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