Python Coding Questions and Answers

Write a Python function to reverse a string.

Use the following Python code:

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

print(reverse_string("hello"))  # Output: "olleh"

Write a Python function to check if a number is prime.

Use the following Python code:

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

print(is_prime(7))  # Output: True

Write a Python function to find the factorial of a number.

Use the following Python code:

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

print(factorial(5))  # Output: 120

Write a Python function to flatten a nested list.

Use the following Python code:

def flatten_list(lst):
    flat_list = []
    for item in lst:
        if isinstance(item, list):
            flat_list.extend(flatten_list(item))
        else:
            flat_list.append(item)
    return flat_list

print(flatten_list([1, [2, [3, [4]]]]))  # Output: [1, 2, 3, 4]

Write a Python function to sort a list of dictionaries by a specific key.

Use the following Python code:

def sort_by_key(lst, key):
    return sorted(lst, key=lambda x: x[key])

people = [{'name': 'John', 'age': 30}, {'name': 'Jane', 'age': 25}]
print(sort_by_key(people, 'age'))

Write a Python function to find the largest number in a list.

Use the following Python code:

def find_largest(lst):
    return max(lst)

print(find_largest([3, 5, 7, 2, 8]))  # Output: 8

Write a Python function to check if a string is a palindrome.

Use the following Python code:

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

print(is_palindrome("radar"))  # Output: True

Write a Python function to count the number of occurrences of a specific element in a list.

Use the following Python code:

def count_occurrences(lst, element):
    return lst.count(element)

print(count_occurrences([1, 2, 3, 2, 4, 2], 2))  # Output: 3

Write a Python function to remove duplicates from a list.

Use the following Python code:

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

print(remove_duplicates([1, 2, 2, 3, 4, 4, 5]))  # Output: [1, 2, 3, 4, 5]

Write a Python function to merge two sorted lists into a single sorted list.

Use the following Python code:

def merge_sorted_lists(lst1, lst2):
    return sorted(lst1 + lst2)

print(merge_sorted_lists([1, 3, 5], [2, 4, 6]))  # Output: [1, 2, 3, 4, 5, 6]

Write a Python function to find the intersection of two lists.

Use the following Python code:

def intersection(lst1, lst2):
    return list(set(lst1) & set(lst2))

print(intersection([1, 2, 3], [2, 3, 4]))  # Output: [2, 3]

Write a Python function to generate a Fibonacci sequence up to a specified number of terms.

Use the following Python code:

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

print(fibonacci(5))  # Output: [0, 1, 1, 2, 3]

Write a Python function to find the common elements between two lists.

Use the following Python code:

def common_elements(lst1, lst2):
    return list(set(lst1) & set(lst2))

print(common_elements([1, 2, 3], [3, 4, 5]))  # Output: [3]

Write a Python function to check if a list is sorted.

Use the following Python code:

def is_sorted(lst):
    return lst == sorted(lst)

print(is_sorted([1, 2, 3, 4]))  # Output: True
print(is_sorted([1, 3, 2, 4]))  # Output: False

Write a Python function to find the longest word in a sentence.

Use the following Python code:

def longest_word(sentence):
    words = sentence.split()
    return max(words, key=len)

print(longest_word("The quick brown fox jumps over the lazy dog"))  # Output: "jumps"

Write a Python function to find the sum of digits of a number.

Use the following Python code:

def sum_of_digits(n):
    return sum(int(digit) for digit in str(n))

print(sum_of_digits(123))  # Output: 6

Write a Python function to calculate the power of a number.

Use the following Python code:

def power(base, exponent):
    return base ** exponent

print(power(2, 3))  # Output: 8

Write a Python function to count the number of unique characters in a string.

Use the following Python code:

def count_unique_chars(s):
    return len(set(s))

print(count_unique_chars("hello"))  # Output: 4

Write a Python function to find the minimum and maximum values in a list.

Use the following Python code:

def find_min_max(lst):
    return min(lst), max(lst)

print(find_min_max([3, 5, 7, 2, 8]))  # Output: (2, 8)

Write a Python function to remove all occurrences of a specific value from a list.

Use the following Python code:

def remove_value(lst, value):
    return [item for item in lst if item != value]

print(remove_value([1, 2, 3, 2, 4], 2))  # Output: [1, 3, 4]