Python Practice Questions & Solutions Day 5 of Learning Python for Data Science

Welcome back to Day 5 of Learning Python for Data Science journey! In the last article, we explored:

✅ Typecasting in Python
✅ Indexing and Slicing in Strings

Now, it’s time to solve the practice questions given in the previous article.
Each question is followed by a detailed explanation and output.

Table of Contents

Write a program that asks the user to input three values:

A whole number
A decimal number
A string
Then print the type of each input using the type() function.

name = input('Enter your name :')
age = int(input('Enter your age :'))
balance = float(input('Enter your balance :'))

print(name, type(name))
print(age, type(age))
print(balance, type(balance))

Write a program that asks the user to input a string containing a number (e.g., “123”). Convert this string into an integer, add 50 to it, and print the result.

try:
    user_input = input("Enter a string containing a number: ")
    number = int(user_input)
    result = number + 50
    print(result)
except ValueError:
    print("Invalid input. Please enter a string that can be converted to an integer.")

What happens if the string is “abc” instead?

If we get "abc" as a input code will throw error as we cannot convert text into number.

Write a program that takes a user-input string and prints:

The first character
The last character
The character at index 3
Handle cases where the string has less than 3 characters.

name = input('Enter your name :')

print('First charecter : ',name[0])
print('Last charecter : ',name[-1])


if len(name)<3:
    print('length less than 3 charecter')
else:
    print('Third charecter : ',name[2])

Write a program that takes a user-input string and prints:

The first 3 characters
The last 3 characters
The entire string in reverse order

string = input('Enter a logn string')

print('The first 3 characters :',string[0:2])
print('The last 3 characters :',string[-3:])
print('The entire string in reverse order :',string[::-1])

Write a program that takes a user-input string and a character. Count and print how many times the character appears in the string. Example: Input: “hello world”, ‘o’ → Output: 2.

word = input('enter a word : ')
char = input('Enter the charecter to count : ')
count = 0

for i in word:
    if i == char:
        count+=1

print(char, f'appears {count} times in ', word)

Write a program to check if a user-input string is a palindrome (a string that reads the same backward as forward). Example: Input: “madam” → Output: “Palindrome”.

string = input('Enter a palindrom')

if string == string[::-1]:
    print('Palindrom')
else:
    print('Not a Palindrom')

Write a program using if-elif-else statements to find the largest of three numbers entered by the user.

num1 = int(input('Enter the first number :'))
num2 = int(input('Enter the second number :'))
num3 = int(input('Enter the third number :'))

if num1 > num2 and num1 > num3:
    print('Largest number is : ',num1)
elif num2 > num3 and  num3 > num1:
    print('Largest number is : ',num2)
else:
    print('Largest number is : ',num3)

Write a program that takes a single character as input and checks whether it is a vowel, consonant, or neither (e.g., a digit or symbol). Use if-elif-else statements for this.

char = input('Enter a charecter : ').lower()

vowels = 'aeiou'

if char in vowels:
    print('Vowel')
elif char not in vowels:
    if char.isdigit():
        print('Digit')
    else:
        print('consonant')

Write a program to calculate the sum of all even numbers from 1 to a user-defined number (inclusive) using a while loop.

num = int(input('Enter a number'))
sum = 0
i = 1
while i <=num:
    if i % 2 == 0:
        sum+=i
    i+=1

print(sum)

num = int(input('Enter a number'))
sum = 0

for i in range(num+1):
    if i % 2 == 0:
        sum += i
    i += 1

print(sum)

Write a program that takes two numbers as input and prints all the prime numbers between them using nested loops. Example: Input: 10, 20 → Output: 11, 13, 17, 19.

num1 = int(input('Enter a number')) 
num2 = int(input('Enter a number')) 

for i in range(num1, num2+1):      
    for j in range(2, i):           
        if i % j == 0:              
            break                   
    else:                           
        print(i, end = ', ')

Write a program that takes an integer as input and calculates the sum of its digits using a loop. Example: Input: 123 → Output: 6 (1 + 2 + 3)

num = input('Enter a number')
sum = 0
for i in num:
    sum+=int(i)

print(sum)

Write a program that takes an integer and reverses its digits. Example: Input: 1234 → Output: 4321

num = input('Enter a number')

num1 = int(num[::-1])

print(num1)

Check for Armstrong Number, A number is an Armstrong number if the sum of its digits raised to the power of the number of digits equals the number itself. Example: Input: 153 → Output: Armstrong number (1³ + 5³ + 3³ = 153)

num = input('Enter a number : ')
length = len(num)
armstrong_sum  = 0

for i in num:
    armstrong_sum  += int(i)**length
if int(num) == armstrong_sum :
    print(num, ' is an armstrong number.')
else:
    print(num, ' is not an armstrong number.')

Write a program that calculates the factorial of a given number using a loop. Example: Input: 5 → Output: 120 (5 × 4 × 3 × 2 × 1)

num = int(input('Enteer number'))

fact = 1 

for i in range(1, num+1): 
    fact *= i

print(fact)

Write a program to print the first N numbers of the Fibonacci sequence using a loop. Example: Input: 7 → Output: 0, 1, 1, 2, 3, 5, 8

num = int(input('Enter a number: '))

a, b = 0, 1  

for i in range(num):  
    print(a, end=', ' if i < num - 1 else '')
    a, b = b, a + b

How this works¶

a and b are initialized with 0, 1 which represents the first 2 number of fibonachi series.
When for loop starts
- Iteration…….current value..print(a)……..a, b = b, a + b
- 1st iteration : a = 0, b = 1 Print: a = 0, Update: a = 1, b = 1
- 2nd iteration : a = 1, b = 1 Print: a = 1, Update: a = 1, b = 2
- 3rd iteration : a = 1, b = 2 Print: a = 1, Update: a = 2, b = 3
- 4th iteration : a = 2, b = 3 Print: a = 2, Update: a = 3, b = 5
- 5th iteration : a = 3, b = 5 Print: a = 3, Update: a = 5, b = 8
- 6th iteration : a = 5, b = 8 Print: a = 5, Update: a = 8, b = 13

Write a program that takes an integer as input and counts the number of digits in it. Example: Input: 34567 → Output: 5

num = input('Enter and number : ')

print(num,f' has {len(num)} digits.')

Write a program that finds the GCD (Greatest Common Divisor) of two numbers using a loop.¶ Example: Input: 48, 18 → Output: 6

num1, num2 = int(input('Enter the first number : ')), int(input('Enter the second number : '))

gcd = []

'''
Using min  because the CGD can not be greater than the small number, 
uning +1 because GCD counld be the smaller number istself
'''

for i in range(2, min(num1, num2)+1): # explained above
    if num1 % i == 0 and num2 % i == 0:
        gcd.append(i)
    else:
        continue

print('GCD is : ', max(gcd))

Write a program that calculates the Least Common Multiple (LCM) of two numbers using loops.¶ Example: Input: 4, 5 → Output: 20

num1, num2 = int(input('Enter the first number : ')), int(input('Enter the second number : '))

gcd = []

for i in range(1, max(num1, num2)):
    if num1 % i == 0 and num2 % i == 0:
        gcd.append(i)
    else:
        continue

print('LCM is : ', (num1 * num2)/max(gcd))

Write a program that checks whether a given number is a palindrome (same forward and backward).¶ Example: Input: 121 → Output: Palindrome Input: 123 → Output: Not a palindrome

num = abs(int(input('Enter a number')))

if str(num) == str(num)[::-1]:
    print(num, 'is a Palindrome')
else:
    print(num, 'is not a palindrome')

Understanding these basics is essential for writing robust Python programs. Keep practicing with different inputs to solidify your understanding!

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Hi, I am Vishal Jaiswal, I have about a decade of experience of working in MNCs like Genpact, Savista, Ingenious. Currently i am working in EXL as a senior quality analyst. Using my writing skills i want to share the experience i have gained and help as many as i can.

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