lesson 7 homework

homework.py

# Homework: Loops

# 🔥Read carefully until the end before you start solving the exercises🔥

# Practice the Basics 💪🏻

# You can uncomment or type the necessary code on each task

# ---------------------------------------------------------------------
# Task 1. Create a basic for loop

# Complete the following code in such a way that this loop prints the characters 
# of `name` one at a time.

name = "Joseph"

for letters in name:
    print(letters)

# ---------------------------------------------------------------------
# Task 2. Create a basic `for` loop with a counter

# Complete the following code in such a way that the loop increments the counter
# and prints the number of characters in `name`name at the end.

name = 'Tom'
counter = 0

for characters in name:
    counter = counter + 1

print(counter)

# ---------------------------------------------------------------------
# Task 3. Create a basic 'while' loop

# Complete the following code in such a way that the loop exits after five iterations, without using break.

# 🔥 Hint: Think of it as: while counter is under 5, increment the counter and print its value🔥

# """
# This should print:
# 1
# 2
# 3
# 4
# 5
# """
counter = 0

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

# ---------------------------------------------------------------------
# Task 4. Exit a loop using break 🛑

# Take the previous example, and modify it so you exit the loop after five iterations, 
# but this time do it using break.

counter = 0

while True:
    counter = counter + 1

    if counter == 6:
        break

    print(counter)
# ---------------------------------------------------------------------
# Task 5. Range

# Remember that range(start, end, step) behaves somewhat like list slicing, so start is inclusive,
# end is exclusive, and step is optional.

# Figure out the values required for range() to generate the expected output.

# 0, 1, 2, 3, 4, 5 (use only one argument)
print(list(range(6)))

# 0, 1, 2, 3, 4, 5 (use two arguments: start and end)
print(list(range(0, 6)))

# Odd numbers between 0 and 10: 1, 3, 5, 7, 9
print(list(range(1, 10, 2)))

# ---------------------------------------------------------------------
# Task 6. Using range() in a loop

# Remember that range() returns an iterable, so you will usually find it used in a for loop.

# Complete the following code so it prints the even numbers between 0 and 10;

for evens in range(0 , 11, 2):
    print(evens)


# Exercises 🏋🏻

# ---------------------------------------------------------------------
# Exercise 1. Digits Only!

# Part one: Given a string of letters and digits, complete the program to print only the digits. 
# For example, for the string '3catsand5tacos', output should be: 3 5

# Strategy:
# - Create variable to hold the string: my_string = '3catsand5tacos'
# - Create a string to represent the numbers: numbers = '1234567890'
# - Create a loop to iterate through characters of my_string. 
# - If the character is a digit (`if character in numbers`) print it.

my_string = 's0m3 str1ng w1th numb3r5'
numbers = '1234567890'

for character in my_string:
    if character in numbers:
        print(character)


# Part two: Modify the code to print the first digit only


for character in my_string:
    if character in numbers:
        print(character)
        break

# ---------------------------------------------------------------------
# Exercise 2. Vowel Counter

# Imagine you're working on a text analysis tool that needs to count the number of vowels in a given string. 
# As a simple practice, you have been provided with a famous quote. 
# Your task is to count and display the total number of vowels in this quote.

quote = "Life is like riding a bicycle. To keep your balance, you MUST keep moving."
vowel_count = 0

for vowel in quote:
    if vowel in 'aeiouAEIOU':
        vowel_count += 1

print(f"The number of vowels in the quote is: {vowel_count}")

# ---------------------------------------------------------------------
# Exercise 3. Sum of all Digits 🔢

# You have a mixed string that contains both letters and numbers, like an alphanumeric password or 
# a serial key. Your task is to find all the numbers in this string and sum them up.

# Hint: You can put the numbers you find into a list (cast as `int`) and use `sum()` on the list at the end.

mixed_string = "abc123xyz456"
digits = "0123456789"
found_digits = []

for char in mixed_string:
    if char in digits:
        found_digits.append(int(char))

print(f"The total sum of numbers in the string is: {sum(found_digits)}")

# ---------------------------------------------------------------------
# Exercise 4. Password Strength Checker

# You are helping to develop a user registration page for a website. As part of the registration process, 
# you need to ensure that submitted passwords are strong. A strong password should have at least 8 characters.

# Create a Python program to check the strength of a list of passwords and count how many are strong.


passwords = ['Passw0rd', 'hello', 'strongPass1', 'weak']
strong_password_count = 0
for letter in passwords:
    if len(letter) >= 8:
        strong_password_count = strong_password_count + 1

print(f"Number of strong passwords: {strong_password_count}")

# ---------------------------------------------------------------------
# Exercise 5. The Red Crayon 🖍️

# Imagine you have a box of crayons, and you're looking for a "Red" crayon. 
# You pull out one crayon at a time from the box. 

# Use a while loop to simulate this scenario.  As soon as you find the "Red" crayon, stop the loop.


colors = ["Blue", "Yellow", "Green", "Red", "Purple", "Orange"]
index = 0

# This should basically say: while the current color being evaluated is
# different than "Red", increment to the next color and try again.
while colors[index] != "Red":
    print(f"Found {colors[index]} crayon. Still looking for Red.")
    index += 1

print("Found the Red crayon!")