Day 002

Udemy Python Bootcamp Day 002

Data Types

# string

print(“Hello”[0]) #H

print(“123” + “456”) #123456

# integer

print(123 + 456) # 579

print(1_123 + 99_234) # 100357 : ,대신 _입력가능 (추출할때는 무시함)

# float

3.141592

# boolean

True
False

Float - Float

# 4.2 - 1.3 등 float - float 을 할 때는 round()를 이용해 반올림 해주어야 한다.
print(4.2 - 1.3) # output : 2.900000000000004

print(round(4.2 - 1.3, 2)) # output : 2.9

두자릿수 더하기

two_digit_number = input(“Type a two digit number: ”)

내가 쓴 답

string = str(two_digit_number)

print(int(string[0]) + int(string[1]))

답안

first_digit = int(two_digit_number[0])
second_digit = int(two_digit_number[1])

two_digit_number = first_digit + second_digit

print(two_digit_number)

연산순서 : PEMDASLR

Parentheses : ()
Exponents : **
Multiplication : *
Division : /
Addtion : +
Subtraction : -
Left
Right

print(3 * 3 + 3 / 3 - 3) # 7.0

print(int(3 * 3 + 3 / 3 - 3)) # 7

BMI Calculator

height = input(“enter your height in m: ”)
weight = input(“enter your weight in kg: ”)

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

print(int(bmi))

input function은 stiring(문자열)으로 되어있으니 연산자 입력 시 주의해야 한다.

extra 연산자

print(round(8 / 3, 2)) # 2.67 : round(, n)에서 n은 나타낼 소수점 자리수

print(round(8 // 3)) # 2 : print(int(8 / 3))과 값이 같다.

print(4 // 2) # 2 : print(4 / 2)의 값이 2.0인 것과 비교

result = 4 / 2
result /= 2
print(result) # 1.0

+=
-=
*=
/=

f-string

score = 0
height = 1.8
isWinning = True

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

# your score is 0, your height is 1.8, you are winning is True

f-string을 이용하면 데이터 타입과 관계없이 문구 출력하기 간편하다.
({}.format()을 이용하는 방법도 있음)

Life in Weeks

age = input(“What is your current age? ”)

age_remaining = 90 - int(age)
day = age_remaining * 365
week = age_remaining * 52
month = age_remaining * 12

message = f”You have {day} days, {week} weeks, and {month} months left.”
print(message)

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?"))

내가 쓴 답

each = (bill * (1 + tip / 100)) / people
pay = round(each, 2)

답안

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)


# FAQ: How to round to 2 decimal places?

print(f"Each person should pay: ${final_amount}")