Python journey

Introduction

For this session, we'll learn data types to create a tip calculator.

Summary

Requirements
Tools and version
Project: BMI calculator, Tip calculator
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

BMI calculator

height = input("Enter your height in meters: ")
weight = input("Enter your weight in kg: ")
bmi = int(weight) /(float(height) ** 2)

print(int(bmi))

Time remaining

age = input("What's your current age? \n")
max_age = 90

age_in_int = int(age)
years_remaining = (max_age - age_in_int)
days_remaining = years_remaining * 365
weeks_remaining = years_remaining * 52
months_remaining = years_remaining * 12

message = f"You have {days_remaining} days, {weeks_remaining} weeks, and {months_remaining} months."

print(message)

Tip calculator

Exercise:

Output a greeting message
Ask for total bill
Ask for how many percentage tip you'd like to give
Ask fo how many people to split the bill
Give the amount of each person should pay with only 2 digits

print("Welcome to the tip calculator!")

total_bill = float(input("What was the total bill? \n$"))

percent_tip = int(input("What percentage tip would you like to give? 10, 12, or 15? "))

people = int(input("How many people to split the bill?"))

total_bill_tip = total_bill * (percent_tip/100) + total_bill

total_for_each = total_bill_tip / people

# total_rounded = round(total_for_each, 2)
total_rounded = "{:.2f}".format(total_for_each)

print(f"The amount for each people is ${total_rounded}")

Tips

Data types

Strings

String of characters:

print("Hello"[2])
# output "l"

Integer

Declare an integer by write the number without anything else

print(1+2)

For big numbers, you can add "_"

123_456

#same as 123456

Float

3.14159

Boolean

Basic true or false value

Type Error, Type Checking and Type conversion

len() function doesn't like working with integer

concatenation works only with strings

num_char = len(input("What's you name? \n"))
print("Your name has " + num_char + "characters.")

Check type

Use type function to investigate which type you have

type(what to check)

Convert into string

str(object_to_convert)

Division in Python always give floating number

Mathematical operations

Remember PEMDAS = order of priority

Parentheses
Exponents
Multiplication
Division
Addition
Substraction

round() function to round number

round(number, nb_digits after point)
round(2.66666, 2)

F Strings

score = 0
height = 1.5
isWinning = True

print(f"your score is {score}, your height is {height} and, you are winning is {isWinning}")

Avoid converting everything, use variables by adding "f" before "quotation marks"

helene-nguyen / python-calculators