Top 20 Python Practice Problems for Beginners

Certainly! Below is a detailed Step-by-Step Guide titled "Top 20 Python Practice Problems for Beginners" designed to help beginners understand and solve common Python problems effectively.

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Table of Contents

1. Setting Up Python Environment
2. Problem 1-5
3. Problem 6-10
4. Problem 11-15
5. Problem 16-20
6. Tips and Best Practices

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Step 1: Setting Up Your Python Environment

Before you start solving problems, you need to have Python installed along with an editor or IDE.

• Install Python: Download from python.org.
• Choose an IDE or editor: Some popular ones include VS Code, PyCharm, or simple editors like Sublime Text or even IDLE bundled with Python.

• Test your setup: Open your terminal or command prompt and type:

  python –version

  It should display the Python version installed.

• Run a basic program to ensure Python is working:
  python
  print("Hello, World!")

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Step 2: Practicing the First Five Python Problems

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Problem 1: Print "Hello, World!"

Objective: Get familiar with the print statement.

Solution:
python
print("Hello, World!")

Explanation:

• print() function displays output to the console.

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Problem 2: Add Two Numbers

Objective: Take input numbers, add them, and display the result.

Solution:
python
num1 = int(input("Enter first number: "))
num2 = int(input("Enter second number: "))
sum = num1 + num2
print("Sum:", sum)

Explanation:

• input() takes input as string; int() converts it to an integer.
• Adding two integers and printing the result.

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Problem 3: Check if Number is Even or Odd

Objective: Use conditional statements.

Solution:
python
num = int(input("Enter a number: "))
if num % 2 == 0:
print(num, "is Even")
else:
print(num, "is Odd")

Explanation:

• % operator gives remainder; if remainder is 0, number is even.

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Problem 4: Find the Largest of Three Numbers

Objective: Use comparison operators.

Solution:
python
a = int(input("Enter first number: "))
b = int(input("Enter second number: "))
c = int(input("Enter third number: "))

if a >= b and a >= c:
print(a, "is the largest number.")
elif b >= a and b >= c:
print(b, "is the largest number.")
else:
print(c, "is the largest number.")

Explanation:

• Multiple conditions check which is the largest.

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Problem 5: Print a List of Numbers 1 to N

Objective: Use loops.

Solution:
python
n = int(input("Enter a number: "))
for i in range(1, n+1):
print(i, end=’ ‘)

Explanation:

• range(1, n+1) generates numbers from 1 to n.
• end=' ' prints numbers on the same line separated by spaces.

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Step 3: Practice Problems 6-10

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Problem 6: Calculate Factorial of a Number

Solution:
python
n = int(input("Enter a number: "))
factorial = 1

for i in range(1, n+1):
factorial *= i

print(f"Factorial of {n} is {factorial}")

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Problem 7: Check if a String is Palindrome

Solution:
python
s = input("Enter a string: ")

if s == s[::-1]:
print(s, "is a palindrome")
else:
print(s, "is not a palindrome")

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Problem 8: Find the Sum of a List of Numbers

Solution:
python
numbers = list(map(int, input("Enter numbers separated by space: ").split()))
total = sum(numbers)
print("Sum is", total)

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Problem 9: Find the Largest Number in a List

Solution:
python
numbers = list(map(int, input("Enter numbers separated by space: ").split()))
largest = max(numbers)
print("Largest number is", largest)

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Problem 10: Print Fibonacci Sequence up to N Terms

Solution:
python
n = int(input("Enter number of terms: "))
a, b = 0, 1
count = 0

while count < n:
print(a, end=’ ‘)
a, b = b, a + b
count += 1

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Step 4: Practice Problems 11-15

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Problem 11: Count Vowels in a String

python
s = input("Enter a string: ")
count = 0
vowels = "aeiouAEIOU"

for char in s:
if char in vowels:
count += 1

print("Number of vowels:", count)

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Problem 12: Reverse a String

python
s = input("Enter a string: ")
print("Reversed string:", s[::-1])

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Problem 13: Find the Second Largest Number in a List

python
numbers = list(map(int, input("Enter numbers separated by space: ").split()))
numbers = list(set(numbers)) # remove duplicates
numbers.sort()

if len(numbers) >= 2:
print("Second largest number is", numbers[-2])
else:
print("Not enough unique numbers")

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Problem 14: Check Prime Number

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

if num > 1:
for i in range(2, int(num**0.5) + 1):
if (num % i) == 0:
print(num, "is not a prime number")
break
else:
print(num, "is a prime number")
else:
print(num, "is not a prime number")

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Problem 15: Merge Two Lists and Remove Duplicates

python
list1 = list(map(int, input("Enter first list numbers separated by space: ").split()))
list2 = list(map(int, input("Enter second list numbers separated by space: ").split()))

merged = list(set(list1 + list2))
print("Merged list without duplicates:", merged)

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Step 5: Practice Problems 16-20

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Problem 16: Find the Length of a String Without Using len()

python
s = input("Enter a string: ")
count = 0

for char in s:
count += 1

print("Length of string is", count)

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Problem 17: Print Multiplication Table for a Number

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

for i in range(1, 11):
print(f"{num} x {i} = {num*i}")

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Problem 18: Check if Two Strings are Anagrams

python
str1 = input("Enter first string: ").replace(" ", "").lower()
str2 = input("Enter second string: ").replace(" ", "").lower()

if sorted(str1) == sorted(str2):
print("Strings are anagrams")
else:
print("Strings are not anagrams")

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Problem 19: Convert Celsius to Fahrenheit

python
celsius = float(input("Enter temperature in Celsius: "))
fahrenheit = (celsius * 9/5) + 32
print(f"Temperature in Fahrenheit is {fahrenheit}")

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Problem 20: Find the Sum of Digits in a Number

python
num = input("Enter a number: ")
total = 0

for digit in num:
total += int(digit)

print("Sum of digits:", total)

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Step 6: Tips and Best Practices for Beginners

1. Read the problem carefully: Understand input/output requirements.
2. Break down the problem: Solve in smaller parts.
3. Write pseudocode first: Helps create a plan.
4. Test with multiple inputs: Ensure your code works for different cases.
5. Use meaningful variable names: Improves readability.
6. Use comments: Explain complex parts for clarity.
7. Keep practicing: The more you practice, the better you get.
8. Seek help: Use forums or documentation if stuck.

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Feel free to ask if you want explanations or assistance with any specific problem or more advanced topics!