Worked Examples On Python By Akachukwu

Here are 30 Python challenge exercises covering the topics we have done so far:

Operators and Expressions

1. Write a program to calculate the area of a triangle given its base and height using multiplication and division operators.
2. Write a program that swaps the values of two variables without using a temporary variable.
3. Evaluate the expression ((10 + 3) * 2 - 4 / 2) and explain the operator precedence used.

1. Write a program to calculate the area of a triangle given its base and height using multiplication and division operators.

#to calculate the area of a triangle
#halve multiply by base multiply by height
base = input("choose a number of your choice?\n")
height = input("choose a second number of your choice?\n")
input_1 = 1 / 2
multiplicationOperator = input_1 * int(base) * int(height)

print(f"The  quotient of {base} by {height} by {input_1} is: {multiplicationOperator}\n")

3. Evaluate the expression ((10 + 3) * 2 - 4 / 2) and explain the operator precedence used.

#using BODMAS

additionOperator = 10 + 3 #solving the bracket first
divisionOperator = 4 / 2 #solving division next after bracket
multiplicationOperator = int(additionOperator) *   2 #solving multiplication after division
subtractionOperator = int(multiplicationOperator) - int(divisionOperator) #solving subtraction last to get the final answer
print(f"The answer is: {subtractionOperator}\n") #print the value

Data Types, String Concatenation, and Replication

4. Create a program that asks for the user’s first and last name and prints them together using string concatenation.
5. Write a program that replicates a string n times, where n is a user-provided integer.
6. Convert a floating-point number to an integer and a string. Print the results.

4. Create a program that asks for the user’s first and last name and prints them together using string concatenation.

name = input("write your first name?\n")
Surname = input("write your surname?\n")
fullname = ("my name is " + Surname.title() + " " + name.title())
print(f"{fullname}\n")

6. Convert a floating-point number to an integer and a string. Print the results.

float_no = float(input("write down a number\n"))
int_no = int(float_no)
string = (int_no)
print(f"converted to string: {int_no}\n")
print(f"The integer number of the float number is: {string}\n")

Input and len() Function

7. Write a program that takes a user’s full name as input and prints the number of characters in their name.
8. Create a program that asks for the user’s age and calculates the year they were born.
9. Use the len() function to check the length of a password and display whether it is “Weak”, “Moderate”, or “Strong”.

7. Write a program that takes a user’s full name as input and prints the number of characters in their name.

name = input("write your name?\n") #User input his/her name 
fullname = name
Tname = print(len(fullname)) #computer prints the total values of the name eg: akachukwu = 9
print(f"{Tname}\n") #computer prints it in a new line using the dictionary above in line 37

8. Create a program that asks for the user’s age and calculates the year they were born.

age = input("what's your age?\n")
year = 2024
birth = int(year) - int(age)
print(f"the year you were born is: {birth}\n")

Comparison Operators

10. Write a program to check if a given number is greater than, less than, or equal to 50.
11. Take two inputs from the user and compare if the first input is lexicographically smaller than the second.
12. Demonstrate the difference between == and = by writing a small program with both.

10. Write a program to check if a given number is greater than, less than, or equal to 50.

value = input("write a value of your choice?\n") #user is ask to write a value
value_1 = 50 #computers comparing value is 50
greater = int(value) > int(value_1) #it is compared using comparism sign
lesser = int(value) < int(value_1)
if greater:
    print(f"{value} is greater") #using conditional statement to compare
elif lesser:
    print(f"{value} is lesser")
else:
    print(f"{value} is equal")

11. Take two inputs from the user and compare if the first input is lexicographically smaller than the second.

input1 = input("Enter the first string\n")
input2 = input("Enter the second string\n")

# Compare the strings lexicographically
if input1 < input2:
    print(f"'{input1}' is lexicographically smaller than '{input2}'.")
elif input1 > input2:
    print(f"'{input1}' is lexicographically greater than '{input2}'.")
else:
    print(f"'{input1}' is lexicographically equal to '{input2}'.")

12. Demonstrate the difference between == and = by writing a small program with both.

Boolean Operators

13. Write a program to check if a number is divisible by both 3 and 5.
14. Take three user inputs and check if all of them are non-negative numbers using boolean operators.
15. Combine comparison and boolean operators to check if a number is between 10 and 20 (inclusive).

13. Write a program to check if a number is divisible by both 3 and 5Write a program to check if a number is divisible by both 3 and 5

no = int(input("write a number: "))
modulusOperator = no % 3 == 0
modulusOperator2 = no % 5 == 0
if modulusOperator and modulusOperator2 is True:
    print(f"{no} is divisible by 3 and 5")
else:
    print(False)

14. Take three user inputs and check if all of them are non-negative numbers using boolean operators.

no1 = float(input("write a number: "))
no2 = float(input("write a second number: "))
no3 = float(input("write a third number: "))
num1 = no1 >= 0
num2 = no2 >= 0
num3 = no3 >= 0
if num1 and num2 and num3 is True:
    print("all numbers are non negative")
else: 
    print("some numbers are negative")

15. Combine comparison and boolean operators to check if a number is between 10 and 20 (inclusive).

no_input = int(input("write a number: "))
if 10 <= no_input <= 20:
    print("it is inclusive")
else:
    print("it is not inclusive")

Flow Control and Conditional Statements

16. Write a program to display all even numbers between 1 and 50 using a for loop.
17. Create a while loop that counts down from 10 to 0 and prints “Liftoff!” at the end.
18. Write a program that prints all numbers from 1 to 20 but skips multiples of 3 using the continue statement.
19. Use a for loop and break to stop iterating through a list of numbers when you find a negative number.
20. Write a program to calculate the factorial of a user-provided number using a while loop.

Combining Concepts

21. Ask the user for their age, and based on the input, print whether they are a “Child”, “Teenager”, “Adult”, or “Senior”.
22. Write a program that takes a string input and prints “Palindrome” if the string reads the same backward.
23. Use a for loop to generate a multiplication table for a number input by the user.
24. Create a program that calculates the sum of all integers between two numbers provided by the user.
25. Write a program to find the largest and smallest numbers in a list using a for loop.

Bonus Challenges

26. Create a program that asks for a user’s full name and reverses the order of their name (e.g., “John Doe” becomes “Doe John”).
27. Write a guessing game where the user has to guess a random number between 1 and 100. Use while loops to keep asking until they guess correctly.
28. Create a program to check if a user-input string contains both uppercase and lowercase letters.
29. Write a program to count the vowels in a user-provided string.
30. Write a program that takes a list of numbers and prints only the prime numbers from the list.