Python Practice Questions & Solutions Day 4 of Learning Python for Data Science

Welcome back to Day 4 of Learning Python for Data Science! In the last article, we explored:

✅ Comparison Operators
✅ Logical Operators
✅ Loops in Python
✅ Loop Control Statements

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

What will be the output of this code?

python
print(10 == 10)

Solution:
This checks if 10 is equal to 10, which is True.

Output:

True

Write a Python program that checks whether a number is positive, negative, or zero.

Solution:

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

if num > 0:
    print("Positive Number")
elif num < 0:
    print("Negative Number")
else:
    print("Zero")

Example Input/Output:

Enter a number: 5
Positive Number

What will be the output?

print(5 > 3 and 10 > 5)

Solution:
Both conditions 5 > 3 and 10 > 5 are True, so the result is True.

Output:

True

Write a program to check if a number is divisible by both 2 and 5 using logical operators.

Solution:

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

if num % 2 == 0 and num % 5 == 0:
    print("Divisible by both 2 and 5")
else:
    print("Not divisible by both")

Example Input/Output:

Enter a number: 10
Divisible by both 2 and 5

What will be the output of this `while` loop?

x = 1
while x < 5:
    print(x)
    x += 1

Solution:
The loop runs while x is less than 5, printing 1, 2, 3, 4.

Output:

Modify the code below to use a `for` loop instead of `while`:

Solution:

for x in range(1, 6):
    print(x)

Output:

What happens if the `break` statement is removed from the following loop?

for i in range(1, 6):
    if i == 4:
        break
    print(i)

Solution:
Without break, the loop prints all numbers from 1 to 5 instead of stopping at 4.

Output without break:

Write a program that prints all even numbers from 1 to 20 using a loop.

Solution:

for i in range(1, 21):
    if i % 2 == 0:
        print(i, end=" ")

Output:

2 4 6 8 10 12 14 16 18 20

What will be the output of the following?

for i in range(1, 6):
    if i == 3:
        continue
    print(i)

Solution:
The continue statement skips printing 3.

Output:

Write a Python program that skips all numbers divisible by 3 in a loop from 1 to 10 using `continue`.

Solution:

for i in range(1, 11):
    if i % 3 == 0:
        continue
    print(i, end=" ")

Output:

1 2 4 5 7 8 10

Write a `for` loop that prints numbers from 1 to 10 but stops when it reaches 7.

Solution:

for i in range(1, 11):
    if i == 7:
        break
    print(i)

Output:

What will be the output?

x = 5
y = 10
print(x > 2 and y < 15)

Solution:
Both conditions are True, so the result is True.

Output:

True

Write a program that calculates the sum of numbers from 1 to 100 using a `for` loop.

Solution:

total = 0
for i in range(1, 101):
    total += i
print("Sum:", total)

Output:

Sum: 5050

Modify the following loop to stop execution when `x` is greater than 50.

Solution:

x = 1
while x < 100:
    if x > 50:
        break
    print(x, end=" ")
    x += 5

Output:

1 6 11 16 21 26 31 36 41 46

Write a program that counts how many even numbers exist between 1 and 50.

Solution:

count = 0
for i in range(1, 51):
    if i % 2 == 0:
        count += 1
print("Total even numbers:", count)

Output:

Total even numbers: 25

Modify the following loop to use `pass` when `x == 5`.

Solution:

for x in range(10):
    if x == 5:
        pass  # Placeholder
    else:
        print(x)

Output:

Print even numbers from 1 to 20 using a for loop.

for i in range(1,21):
    if i % 2 == 0:
        print(i)
    else:
        continue

Output

Print the sum of numbers from 1 to 50 using a while loop.

num = 1
sum = 0
while num <=50:
    sum += num
    num += 1
print(sum)

Output

Print the reverse of a given string using a loop.

name = 'Vishal'
rev = ''
for i in name:
    rev = i + rev
print(rev)

Output

lahsiV

Explanation In this code when loop is accesing the first charecter from name it gets 'V' and stores in rev. in the next iteration it get i and since condition to store is defined to prepend as i + rev it stores as 'iV' similarly in the next iteration it gets 's' and store as 'siV' and so on.

Use a loop to find the factorial of a number.

num = 5
fac = 1
for i in range(1,num+1):
    fac*=i
print(fac)

Output

Generate the Fibonacci series up to 10 terms using a while loop

# Initialize first two terms
a, b = 0, 1

# Number of terms to generate
count = 0
n = 10  # Total terms

while count <= n:
    print(a, end=", ")  # Print the current term
    a, b = b, a + b  # Update values for the next iteration
    count += 1

Output

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55,

Use a for loop to check if a number is prime.

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

if num <= 1:
    print(f'{num} is not prime.')
else: 
    for i in range(2,num):
        if num % i == 0:
            print(f'{num} is not prime.')
            break
    else:
        print(f'{num} is prime.')

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Vishal

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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