Python journey

Introduction

For this session, we'll learn control flow and logical operators.

Summary

• Requirements

• Tools and version

• Projects

  • even/odd
  • rollercoaster
  • BMI 2.0
  • leap year
  • pizza order program
  • love calculator
  • treasure island

• Some tips

• Useful resources :

  • Sources

Requirements

Python installed and an IDE or online editor like: https://replit.com/

Tools and versions

• OS

  • Linux OS -
  • Windows OS -

• IDE

  • VSCodium v1.77.3

• Techno

  • Python v3.11.3

Project

Even/Odd challenge

print("Odd or even program =======")

number = int(input("What number do you want to check? \n"))

if number % 2 == 0:
    print("The number is even.")
else:
    print("The number is odd.")

Rollercoaster challenge

Find the flow chart:

Solution

if height > 120:
    print("You can ride the rollercoaster!")
    age= int(input("What is your age ?"))

    if age <= 18:
        print("The ticket price is $7.")
    else:
        print("The ticket price is $12.")
else:
    print("Sorry, you have to grow taller before you can ride.")

---

BMI 2.0 challenge

height = float(input("Enter your height in m: "))
weight = float(input("Enter your weight in kg: "))

bmi = round(weight / height**2)

if bmi < 18.5:
    print(f"According to your BMI which is {bmi}, your are underweight!")
elif bmi < 25:
    print(f"According to your BMI which is {bmi}, your have a normal weight!")
elif bmi < 30:
    print(f"According to your BMI which is {bmi}, your are overweight!")
elif bmi < 35:
    print(f"According to your BMI  which is {bmi}, your are obese!")
else:
    print(f"According to your BMI which is {bmi}, your are clinically obese!")

---

Leap year challenge

A year is a leap year if the year is evenly divisible by 4 EXCEPT every year that is evenly divisible by 100 UNLESS the year is also evenly divisible by 400.

Here's the flow chart

Solution

year = int(input("Which year do you want to check? \n"))

if (year % 4) == 0:
    if (year % 100) == 0:
        if (year % 400) == 0:
            print(f"This year {year} is a leap year!")
        else:
            print(f"This year {year} is not a leap year!")
    else:
        print(f"This year {year} is a leap year!")
else:
    print(f"This year {year} is not a leap year!")

---

Rollercoaster 2.0

New flowchart

Solution

print("Welcome to the rollercoaster!")
height = int(input("What is your height in cm? \n"))
child_ticket = 5
youth_ticket = 7
adult_ticket = 12
total_price = 0

if height > 120:
    print("You can ride the rollercoaster!")
    age= int(input("What is your age ? "))

    if age < 12:
        print(f"Child ticket price is ${child_ticket}.")
        total_price = child_ticket
    elif age <= 18:
        print(f"Youth ticket price is ${youth_ticket}.")
        total_price = youth_ticket
    else:
        print(f"Adult ticket price is ${adult_ticket}.")
        total_price = adult_ticket

    ask_photo = input("Would you like a photo? (yes/no) \n")
    if ask_photo == "yes":
        total_price += 3
        print(f"Ok, the total price is ${total_price}.")
    else:
        print(f"Ok, the total price is ${total_price}.")

else:
    print("Sorry, you have to grow taller before you can ride.")

---

Pizza order program

Flowchart

Solution

print("Welcome to Python Pizza deliveries!")
size = input("What size pizza do you want? S, M, or L? \n")
add_pepperoni = input("Do you want to add pepperoni? Y or N \n")
add_extra_cheese = input("Do you want to add extra cheese? Y or N \n")
price = 0

if size == "S":
    price = 15
elif size == "M":
    price = 20
else:
    price = 25

if add_pepperoni == "Y":
    if size == "S":
        price += 2
    else:
        price += 3

if add_extra_cheese == "Y":
    price += 1


print(f"The total bill is ${price}.")

Love calculator

Use logical operators by creating a love calculator.

Instructions: Enter the full names of both people you want to check the Love Score for and the calculator will give you the percentage of Love Score match

Example:

For this challenge, we will use following functions:

str()
int()
input()
count()

concatenation
logical operators

Main program: Treasure Island

Big big flow chart:

Result game:

Tips

IF/ELSE statements

if condition:
    do that
else:
    do that

Nested if/else

if condition:
    if another condition:
      do this
    else:
      do this
else:
    do that

Comparison operators

Operator	Meaning
>	greater than
<	less than
>=	greater than or equal to
<=	less than or equal to
==	equal to
!=	not equal to

Multipe if

if condition1:
  do A
if condition2:
  do B
if condition3:
  do C

Logical operators

A and B => both have to be true
C or D => at least one have to be true
not E => reverse the condition

---

Sources

• Create ASCII draws
• TLdraw for flowcharts