BOOTCAMP 3일차

0611

오늘의 목표

• conditional statements
• logical operators
• code blocks
• scope

Conditional if / else

특정 조건에 따라 a 또는 b 둘 중 하나 수행

if condition:  #우리가 판단할 조건
 do this  #들여쓰기, 조건 충족 시 수행되는 코드
else:     # if 조건 미충족시 수행되는 코드
 do this

◎ Draw.io = 어떤 종류의 순서도나 다이어그램도 만들 수 있는 사이트

 

실습1 - 롤러코스터1

키 120cm 이상만 탑승가능

 

print("Welcome to the rollercoaster!")
height = int(input("What is your height in cm? "))

if height >= 120:
  print("You can ride the rollercoaster!")
else: # same indentation level
  print("Sorry, you have to grow taller before you can ride.")

Comparison operator

>  greater than

<  less than

>= greater than or equal to

<= less than or equal to

== equal to

!= not equal to

Modulo operator

% - 나머지 연산자

ex) 7 % 2 -> 1

 

실습2 - 짝수 홀수 판별기

# 🚨 Don't change the code below 👇
number = int(input("Which number do you want to check? "))
# 🚨 Don't change the code above 👆

#Write your code below this line 👇

if number % 2 == 0:  # 짝수는 나머지가 0
  print("This is an even number.")
else :   #나머지 0이 아닐 경우
print("This is an odd number.")

Nested if / else

중첩 if 문

첫번째 조건이 통과되야만 다음 조건 확인 가능

if condition:  # 조건 충족 시 다음 if 문으로 넘어감
  if another condition: 
  do this
 else:  #두번째 조건 미충족시 실행
  do this
else:  #첫번째 조건 미충족 시 실행
do this

실습 3 - 롤러코스터 2

나이에 따른 금액 추가

if height >= 120:
  print("You can ride the rollercoaster!")
  age = int(input("What is your age? "))
  if age <= 18:
    print("Please pay $7.")
  else:
    print("Please pay $12.")
else: # same indentation level
  print("Sorry, you have to grow taller before you can ride.")

실습 1의 코드와 이어서 보면 된다.

if / elif / else

if condition1:
 do a
elif condition2:  #원하는 만큼 조건 추가가능
 do b
else:
do this

 a, b,c 중 하나만 수행된다.

실습4 - 롤러코스터 3

elif를 이용해 나이대를 더 세분화

if height >= 120:
  print("You can ride the rollercoaster!")
  age = int(input("What is your age? "))
  if age < 12:
    print("Please pay $5.")
  elif age <= 18:
    print("Please pay $7.")
  else:
    print("Please pay $12.")
else: # same indentation level
  print("Sorry, you have to grow taller before you can ride.")

실습5 - BMI 2.0

값 해석이 추가됨

# 🚨 Don't change the code below 👇
height = float(input("enter your height in m: "))
weight = float(input("enter your weight in kg: "))
# 🚨 Don't change the code above 👆

#Write your code below this line 👇

bmi = round(weight / (height ** 2))

#bmi 지수에 따른 결과 해석
if bmi < 18.5:
  print(f"Your BMI is {bmi}, you are underweight.")
elif bmi < 25:
  print(f"Your BMI is {bmi}, you have a normal weight")
elif bmi < 30:
  print(f"Your BMI is {bmi}, you are slightly overweight")
elif bmi < 35:
  print(f"Your BMI is {bmi}, you are obese")
else :
  print(f"Your BMI is {bmi}, you are clinically obese.")

실습6 - leap year

윤년 계산기

# 🚨 Don't change the code below 👇
year = int(input("Which year do you want to check? "))
# 🚨 Don't change the code above 👆

#Write your code below this line 👇

if year % 4 == 0:
  if year % 100 == 0:
    if year % 400 == 0:
      print("Leap year.")
    else:
      print("Not leap year.")
  else:
    print("Leap year.")
else:
  print("Not leap year")

Multiple if

다수의 조건이 있어 앞서 확인한 조건이 참이어도 여러 조건을 확인해야하는 상황

if condition1:
 do a
if condition2:
 do b
if condition3:
 do c
 # 세 가지 조건 모두 확인, 모드 참이면 a , b , c 모두 실행

 

실습7 - 롤러코스터 4

multiple if 를 이용해 사진  구매 여부 추가

print("Welcome to the rollercoaster!")
height = int(input("What is your height in cm? "))
bill = 0

if height >= 120:
  print("You can ride the rollercoaster!")
  age = int(input("What is your age? "))
  if age < 12:
    bill = 5 #사진 값을 더하기 위해 변수처리
    print("Child tickets are $5.")
  elif age <= 18:
    bill = 7
    print("Youth tickets are $7.")
  else:
    bill = 12
    print("Adult tickets are $12.")
  # 계산 가격알려주는 대신 어떤 표를 살 수 있는지 알려줌
#그 다음 사진을 원하는지 물음, 두번째 if 와 같은 들여쓰기에서 -> 120이상시 해당되기에
  wants_photo = input("Do you want a photo taken? Y or N. ")
  if wants_photo == "Y":
    bill += 3
  
  print(f"Your final bill is ${bill}")

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

실습8 - 피자주문

#내가 작성한 코드
# 🚨 Don't change the code below 👇
print("Welcome to Python Pizza Deliveries!")
size = input("What size pizza do you want? S, M, or L ")
add_pepperoni = input("Do you want pepperoni? Y or N ")
extra_cheese = input("Do you want extra cheese? Y or N ")
# 🚨 Don't change the code above 👆
#Write your code below this line 👇

if size == "S":
  bill = 15
  if add_pepperoni == "Y":
    bill += 2

elif size == "M":
  bill = 20
else:
  bill = 25
  if add_pepperoni == "Y":
    bill += 3
if extra_cheese == "Y":
  bill += 1
print(f"Your final bill is: ${bill}")

# solution code
# 🚨 Don't change the code below 👇
print("Welcome to Python Pizza Deliveries!")
size = input("What size pizza do you want? S, M, or L ")
add_pepperoni = input("Do you want pepperoni? Y or N ")
extra_cheese = input("Do you want extra cheese? Y or N ")
# 🚨 Don't change the code above 👆

#Write your code below this line 👇

bill = 0

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

if add_pepperoni == "Y":
  if size == "S":
    bill += 2
  else:
    bill += 3
    
if extra_cheese == "Y":
  bill += 1
  
print(f"Your final bill is: ${bill}.")

실습9 - 롤러코스터 5

나이대 추가

print("Welcome to the rollercoaster!")
height = int(input("What is your height in cm? "))
bill = 0

if height >= 120:
  print("You can ride the rollercoaster!")
  age = int(input("What is your age? "))
  if age < 12:
    bill = 5
    print("Child tickets are $5.")
  elif age <= 18:
    bill = 7
    print("Youth tickets are $7.")
  elif age >= 45 and age <= 55: # 나이대 추가, and 연산자
    print("Everything is going to be ok. Have a free ride on us!")
  else:
    bill = 12
    print("Adult tickets are $12.")
  
  wants_photo = input("Do you want a photo taken? Y or N. ")
  if wants_photo == "Y":
    bill += 3
  
  print(f"Your final bill is ${bill}")

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

if condition1 & condition 2 %condition3

여러 조건이 같은 행의 코드 안에 있을 때

if condition1 & condition2 & condition3:
 do
else:
 do this

Logical operators

A and B   둘 다 참이면 T

C or D     둘 중 하나 참, 둘 다 참이면 T, 둘 다 거짓이면 F

not E       조건에 반대되는 값, 조건 참이면 F, 조건 거짓이면 T

lower( )

소문자로 표현해주는 함수

count( )

개수를 세어주는 함수

"Angela".lower()
# angela
"Angela".count("a")
# 1

실습10 - Love calculator

한국의 이름점 과 비슷

두 명의 이름에서 t,r,u,e 와 l,o,v,e 와 같은 글자 수를 구해서 점수를 출력

# 🚨 Don't change the code below 👇
print("Welcome to the Love Calculator!")
name1 = input("What is your name? \n")
name2 = input("What is their name? \n")
# 🚨 Don't change the code above 👆

#Write your code below this line 👇

combine_name = name1 + name2 
lower_combine_name = combine_name.lower()

t = lower_combine_name.count("t")
r = lower_combine_name.count("r")
u = lower_combine_name.count("u")
e = lower_combine_name.count("e")
first_num = t + r + u + e

l = lower_combine_name.count("l")
o = lower_combine_name.count("o")
v = lower_combine_name.count("v")
e = lower_combine_name.count("e")
second_num = l + o + v + e

score = int(str(first_num) + str(second_num))
#first_num 과 second_num은 정수 문자열로 하나로 이어줌-문자열 변환 
#if문을 위해 다시 정수형으로 바꿔준다

if score<10 or score>90:
  print(f"Your score is {score}, you go together like coke and mentos.")
elif score>=40 and score <=50:
  print(f"Your score is {score}, you are alright together.")
else:
  print(f"Your score is {score}.")

다중 문자열 출력

print(""" """)

오늘의 프로젝트 - 게임 만들기

# mine
print("Welcome to Treasure Island.")
print("Your mission is to find the treasure.") 
#Write your code below this line 👇

choice1 = input('You\'re at a cross road. Where do you want to go? Type "left" or "right" \n').lower()
if choice1 == "left":
  choice2 = input('You\'ve come to a lake. There is an island in the middle of the lake. Type "wait" to wait for a boat. Type "swim" to swim across. \n').lower()
  if choice2 == "wait":
    choice3 = input("You arrive at the island unharmed. There is a house with 3 doors. One red, one yellow and one blue. Which colour do you choose? \n").lower()
    if choice3 == "red":
      print("It's a room full of fire. Game Over.")
    elif choice3 == "blue":
      print("You enter a room of beasts. Game Over.")
    elif choice3 == "yellow":
      print("You found the treasure! You Win!")
    else :
      print("You chose a door that doesn't exist. Game Over.")
  else:
    print("You get attacked by an angry trout. Game Over.")
else:
  print("You fell into a hole. Game Over.")
print("Welcome to Treasure Island.")
print("Your mission is to find the treasure.")

#solution
print("Welcome to Treasure Island.")
print("Your mission is to find the treasure.") 
#Write your code below this line 👇

choice1 = input('You\'re at a cross road. Where do you want to go? Type "left" or "right" \n').lower()
if choice1 == "left":
  choice2 = input('You\'ve come to a lake. There is an island in the middle of the lake. Type "wait" to wait for a boat. Type "swim" to swim across. \n').lower()
  if choice2 == "wait":
    choice3 = input("You arrive at the island unharmed. There is a house with 3 doors. One red, one yellow and one blue. Which colour do you choose? \n").lower()
    if choice3 == "red":
      print("It's a room full of fire. Game Over.")
    elif choice3 == "blue":
      print("You enter a room of beasts. Game Over.")
    elif choice3 == "yellow":
      print("You found the treasure! You Win!")
    else :
      print("You chose a door that doesn't exist. Game Over.")
  else:
    print("You get attacked by an angry trout. Game Over.")
else:
  print("You fell into a hole. Game Over.")