Python from Angela

Day-2

print first character of a string.

    # print first character of a string.
    print("Hello"[0]) ## this will print 'H' 

Typecasting

    num_char = len(input("what is your name: "))
    new_num_char = str(num_char) ## This is type casting
    print("your name has " + new_num_char + " characters.")

    output: 
    what is your name: Donald Trump
    your name has 12 characters.
 
 

 
    print(70 + float("100.5"))
    output: 170.5

    
    print(str(70) + str(100))
    output: 70100

Data Types

Ques: Write a program that adds the digits in a 2 digit number. e.g. if the input was 35, then the output should be 3 + 5 = 8.

 
    two_digit_number = input("Type a two digit number: ")

    first_digit_number = two_digit_number[0]
    second_digit_number = two_digit_number[1]
    result = int(first_digit_number) + int(second_digit_number)
    print(result)


    ## or


    two_digit_number = input("Type a two digit number: ")

    ## Get the first and second digits using subscripting then convert string to int.
    first_digit_number = int(two_digit_number[0])
    second_digit_number = int(two_digit_number[1])

    ## Add the two digits together
    two_digit_number = second_digit_number + first_digit_number

    print(two_digit_number)

Operators in Python

Parentheses---()

Exponents --- **

Multiplication -- *

Division--- /

Addition -- +

Subtraction -- Minus -

BMI Calculator

 
    ## BMI Calculator
    height = input("enter your height in m: ")
    weight = input("enter your weight in kg: ")

    bmi = int(weight) / float(height) ** 2

    bmi_int = int(bmi) ##  or print(int(bmi))

    print(bmi_int)

Round

     
    print(round(8 / 3))
 
    output: 3

 
     print(round(8 / 3, 3))  ## last 3 will make 3 decimal after (.)
     

     output: 2.667

     
    print(round(10 / 3, 5))
    

    output: 3.33333

     
    print(round(14 / 3))
     
     output: 5

   
     print(round(14 / 3, 3))
     
     output: 4.667

  
  print(round(20 / 3))
 
    output: 7

 
    print(round(19 / 3))
    
    output: 6

     
    print(round(19 / 3, 4))
 
    output: 6.3333

It will print integer value

 
    print(8 // 3)
 
    output: 2 

    print(type(8 // 3))
    <class 'int'>

It will print Floating number

     
    print(8 / 3)
   
    output: 2.6666666666666665
 
    print(type(8 / 3))
    <class 'float'>

F-String

 
     
    ## F-string
    score = 0
    height = 1.8
    winner = True
    # F-string
    print(f"your score is {score}, your height is {height}, your winning is {winner}")

    OUTPUT: your score is 0, your height is 1.8, your winning is True
 

Ques: 1:

Create a program using maths and f-strings that tells us how many Days, weeks, months we have left if we live until 90 years old.

Sol:

    age = int(input("enter your current age: "))
    years_remaining = 90 - age
    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)

Make a Tip calculator

    print("welcome to the tip calculator.")
    bill = float(input("what was the total bill? $ "))
    tip = int(input("How much tip would you like to give? 10, 12, or 15? "))

    people = int(input("How many people to split the bill? "))
    tip_as_percent = tip / 100
    total_tip_amount = bill * tip_as_percent
    total_bill = bill + total_tip_amount
    bill_per_person = total_bill / people
    final_amount = round(bill_per_person, 2)
    final_amount = "{:.2f}".format(bill_per_person)  ## round two decimal places using .2f
    print(f"Each person should pay: ${final_amount}")

Angela Python