Python Learning Day 5: Mastering Loops, Conditions, and Password Generation

1. Calculating the Sum of Even Numbers

Concept:

This program calculates the sum of all even numbers from 1 to a given number, X. It uses a loop and the range() function to iterate through even numbers up to X.

Code Explanation:

sum = 0
n = int(input("Enter the number till which the number needs to be added: "))
for num in range(0, n + 2, 2):
    sum += num
print(f"The sum of all even numbers between 0 and {n} is {sum}")

• Initialization: sum is initialized to 0 to store the cumulative sum of even numbers.

• Input: n is taken as user input to specify the upper limit till which even numbers are considered.

• Loop: for num in range(0, n + 2, 2) iterates over even numbers from 0 to n (inclusive) with a step of 2.

• Sum Calculation: Inside the loop, each even number num is added to sum.

• Output: Finally, it prints the total sum of even numbers up to n.

2. Calculating Average Student Height

Concept:

This program calculates the average height of students from a list of heights without using built-in functions like sum() or len().

Code Explanation:

sum = 0
num = 0
student_height = [151, 145, 179]
for student in student_height:
    sum += student
    num += 1
average_height = round(sum / num)
print(f"The total height of students is {sum}")
print(f"The total number of students is {num}")
print(f"The average height of students is {average_height}")

• Initialization: sum starts at 0 to accumulate the total height, and num starts at 0 to count the number of students.

• Loop: for student in student_height iterates through each student's height in the student_height list.

• Sum and Count: Inside the loop, it adds each student's height to sum and increments num.

• Average Calculation: average_height is calculated as the rounded result of sum / num.

• Output: It prints the total height, total number of students, and average height.

3. FizzBuzz Game

Concept:

The FizzBuzz game prints numbers from 1 to 100, replacing multiples of 3 with "Fizz", multiples of 5 with "Buzz", and multiples of both with "FizzBuzz".

Code Explanation:

for num in range(1, 101):
    if num % 3 == 0 and num % 5 == 0:
        print("FizzBuzz")
    elif num % 3 == 0:
        print("Fizz")
    elif num % 5 == 0:
        print("Buzz")
    else:
        print(num)

image

• Loop: for num in range(1, 101) iterates from 1 to 100 (inclusive).

• Conditions:

  • if num % 3 == 0 and num % 5 == 0: checks if num is divisible by both 3 and 5.

  • elif num % 3 == 0: checks if num is divisible by 3.

  • elif num % 5 == 0: checks if num is divisible by 5.

  • else: prints the number itself if none of the above conditions are met.

• Output: It prints "Fizz", "Buzz", "FizzBuzz", or the number depending on the conditions.

4. Finding the Highest Score

Concept:

This program finds the highest score from a list of student scores without using max().

Code Explanation:

High_Score = 0
student_scores = [78, 65, 89, 86, 55, 91, 64, 89]
for score in student_scores:
    if score > High_Score:
        High_Score = score
print(f"The highest score in the class is: {High_Score}")

• Initialization: High_Score starts at 0 to track the highest score found.

• Loop: for score in student_scores iterates through each score in student_scores.

• Comparison: Inside the loop, it compares each score with High_Score and updates High_Score if the current score is higher.

• Output: It prints the highest score found in the list.

5. Password Generator

Concept:

The Password Generator creates a random password with specified numbers of letters, symbols, and numbers.

Code Explanation:

import random

letters = ['a', 'b', ..., 'Z']
numbers = ['0', '1', ..., '9']
symbols = ['!', '#', ..., '+']

nr_letters = int(input("How many letters would you like in your password?\n"))
nr_symbols = int(input("How many symbols would you like?\n"))
nr_numbers = int(input("How many numbers would you like?\n"))

password_list = []

# Adding letters
for char in range(1, nr_letters + 1):
    password_list.append(random.choice(letters))

# Adding symbols
for char in range(1, nr_symbols + 1):
    password_list.append(random.choice(symbols))

# Adding numbers
for char in range(1, nr_numbers + 1):
    password_list.append(random.choice(numbers))

random.shuffle(password_list)  # Shuffle the password list

password = ""
for char in password_list:
    password += char

print(f"Your password is: {password}")

• 

• Imports: import random imports the random module for generating random elements.

• Lists: letters, numbers, and symbols store possible characters for the password.

• User Input: nr_letters, nr_symbols, and nr_numbers are taken as input for the number of letters, symbols, and numbers in the password.

• Password Generation:

  • Loops add random characters to password_list based on user input.

  • random.shuffle(password_list) shuffles the elements in password_list.

  • A loop concatenates elements in password_list to form password.

• Output: It prints the generated password.

These projects have helped me deepen my understanding of Python's foundational concepts. Stay tuned for more updates on my Python learning journey!