4. duplicates

l=[]
g=[]
en=int(input("Enter no"))
for e in range(en):
    el=int(input("enter elt"))
    l.append(el)
    g.append(el)
for a in l:
    e>1
    d=l.index(a)
del l[a]
print(g)
print(l)

2. palindrome

n = int(input("Enter a number: "))
s=0
t=n
while n>0:
    r=n%10
    s=s*10+r
    n=n//10
if s==t:
    print("yes")
else:
    print("s")

2. Armstrong number
nu = int(input("Enter a number: "))
n = nu
p = len(str(nu))
t = 0

while n > 0:
    d = n % 10
    t += d ** p
    n //= 10

if t == nu:
    print("Armstrong Number")
else:
    print("Not an Armstrong Number")

2. n natural number
s=1
for i in range(1,n+1):
s=s*i
print(s)

3. smallest and largest
nums = list(map(int, input("Enter up to 5 numbers separated by space: ").split()))[:5]

if not nums:
    print("List is empty")
else:    #
    smallest = nums[0]
    largest = nums[0]
    
    for x in nums:
        if x < smallest:
            smallest = x
        if x > largest:
            largest = x
            
    result = smallest + largest
    print(f"Smallest: {smallest}, Largest: {largest}")
    print(f"Sum: {result}")

5. prime even tuple
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


try:
    
    user_input = input("Enter integers separated by commas (e.g., 2, 3, 4, 5): ")
    numbers = eval(f"({user_input})") 
    
    if not all(isinstance(x, int) for x in numbers):
        raise ValueError("All elements must be integers.")

    
    prime_numbers = tuple(n for n in numbers if is_prime(n))
    print(f"Prime numbers in the tuple: {prime_numbers}")

    
    sum_even_indices = sum(numbers[i] for i in range(0, len(numbers), 2))
    print(f"Sum of numbers at even indices: {sum_even_indices}")

    
    smallest_num = min(numbers)
    largest_num = max(numbers)
    print(f"Smallest number: {smallest_num}")
    print(f"Largest number: {largest_num}")

except (ValueError, SyntaxError, TypeError) as e:
    print(f"Invalid input. Please enter integers separated by commas. Error: {e}")


6. longest word
str_input = input("Enter a string: ")
words = str_input.split() 

if words:
    
    longest_word = max(words, key=len)
    print(f"Longest Word = {longest_word}")
else:
    print("The input string is empty.")


7. avg mark
n = int(input("Enter a string: "))
for k in range(n):
    m=eval(input("enter mark"))
t=m
a=t/n
print(a)


8. various list
# Menu Driven List Operations Program

def display_list(lst):
    print("Current List:", lst)

# Taking initial list input from user
user_list = []

n = int(input("Enter number of elements in the list: "))
for i in range(n):
    element = input(f"Enter element {i+1}: ")
    user_list.append(element)

while True:
    print("\n----- MENU -----")
    print("1. Append an element")
    print("2. Modify existing element")
    print("3. Delete element from its index")
    print("4. Sort list in descending order")
    print("5. Display list")
    print("6. Exit")

    choice = input("Enter your choice (1-6): ")

    if choice == '1':
        element = input("Enter element to append: ")
        user_list.append(element)
        print("Element appended successfully.")
        display_list(user_list)

    elif choice == '2':
        try:
            index = int(input("Enter index of element to modify: "))
            if 0 <= index < len(user_list):
                new_value = input("Enter new value: ")
                user_list[index] = new_value
                print("Element modified successfully.")
            else:
                print("Invalid index!")
        except ValueError:
            print("Please enter a valid number.")
        display_list(user_list)

    elif choice == '3':
        try:
            index = int(input("Enter index of element to delete: "))
            if 0 <= index < len(user_list):
                user_list.pop(index)
                print("Element deleted successfully.")
            else:
                print("Invalid index!")
        except ValueError:
            print("Please enter a valid number.")
        display_list(user_list)

    elif choice == '4':
        user_list.sort(reverse=True)
        print("List sorted in descending order.")
        display_list(user_list)

    elif choice == '5':
        display_list(user_list)

    elif choice == '6':
        print("Exiting program...")
        break

    else:
        print("Invalid choice! Please select between 1-6.")


9. country
country_dict = {}

n = int(input("Enter number of countries: "))

for i in range(n):
    country = input(f"Enter country {i+1} name: ").strip()
    capital = input(f"Enter capital of {country}: ").strip()
    country_dict[country] = capital

search_country = input("\nEnter country name to find its capital: ").strip()

if search_country in country_dict:
    print(f"The capital of {search_country} is {country_dict[search_country]}")
else:
    print("Country not found in dictionary.")



10. phone book
phone_book = {}

n = int(input("Enter number of students: "))

for i in range(n):
    name = input(f"Enter name of student {i+1}: ").strip()
    number = input(f"Enter phone number of {name}: ").strip()
    phone_book[name] = number

search_name = input("\nEnter name to search: ").strip()

if search_name in phone_book:
    print(f"Phone number of {search_name} is {phone_book[search_name]}")
else:
    print("No such name is available.")

print("\nComplete Phone Book Dictionary:")
print(phone_book)