파이썬 문법 응용 과제

1. 조건문

요구조건

• 사용자의 시험 점수를 입력받아 등급을 출력하는 코드를 만들어주세요
  • 등급표
    • 91~100 : A
    • 81~90 : B
    • 71~80 : C
    • ~71 : F

def get_grade(score):
    # some code

score = int(input())
grade = get_grade(score)
print(grade) # A ~ F

def get_grade(score):
    if 90 < score < 101:
        return "A"
    elif 80 < score < 91:
        return "B"
    elif 70 < score < 81:
        return "C"
    elif score <= 70:
        return "F"
        
score = int(input())
grade = get_grade(score)
print(grade)

2. 반복문(while)

요구조건

• 사용자의 입력을 받아 반복하는 프로그램을 만들어주세요
• 사용자가 숫자를 입력했을 경우 입력값에 2배를 곱한 수를 출력해주세요
• 사용자가 문자를 입력했을 경우 “입력한 문자는 {} 입니다.” 라는 문구를 출력해주세요
  • {} 자리에는 사용자가 입력한 문자가 들어가야 합니다.
• 사용자가 exit을 입력하거나 숫자가 5회 이상 입력됐을 경우 프로그램을 종료시켜주세요

cnt = 1
while True:
    n = input()
    try:
        if n == "exit": break
        elif cnt >= 5:
            n = int(n)
            n *= 2
            print(n)
            break
        
        n = int(n)
        n *= 2
        cnt +=1
        print(n)
        
    except ValueError:
        print(f"입력한 문자는 {n} 입니다.")

3. 반복문(for)

요구조건

• 입출력 예제에 있는 사람들 중, 평균 성적이 70점 이상인 사용자의 이름과 나이를 출력해주세요

users = [
    {"name": "Ronald", "age": 30, "math_score": 93, "science_score": 65, "english_score": 93, "social_score": 92},
    {"name": "Amelia", "age": 24, "math_score": 88, "science_score": 52, "english_score": 78, "social_score": 91},
    {"name": "Nathaniel", "age": 28, "math_score": 48, "science_score": 40, "english_score": 49, "social_score": 91},
    {"name": "Sally", "age": 29, "math_score": 100, "science_score": 69, "english_score": 67, "social_score": 82},
    {"name": "Alexander", "age": 30, "math_score": 69, "science_score": 52, "english_score": 98, "social_score": 44},
    {"name": "Madge", "age": 22, "math_score": 52, "science_score": 63, "english_score": 54, "social_score": 47},
    {"name": "Trevor", "age": 23, "math_score": 89, "science_score": 88, "english_score": 69, "social_score": 93},
    {"name": "Andre", "age": 23, "math_score": 50, "science_score": 56, "english_score": 99, "social_score": 54},
    {"name": "Rodney", "age": 16, "math_score": 66, "science_score": 55, "english_score": 58, "social_score": 43},
    {"name": "Raymond", "age": 26, "math_score": 49, "science_score": 55, "english_score": 95, "social_score": 82},
    {"name": "Scott", "age": 15, "math_score": 85, "science_score": 92, "english_score": 56, "social_score": 85},
    {"name": "Jeanette", "age": 28, "math_score": 48, "science_score": 65, "english_score": 77, "social_score": 94},
    {"name": "Sallie", "age": 25, "math_score": 42, "science_score": 72, "english_score": 95, "social_score": 44},
    {"name": "Richard", "age": 21, "math_score": 71, "science_score": 95, "english_score": 61, "social_score": 59},
    {"name": "Callie", "age": 15, "math_score": 98, "science_score": 50, "english_score": 100, "social_score": 74},
]

def get_filter_user(users):
    # some code
    return filter_users

filter_users = get_filter_user(users)
pprint(filter_users)
"""
[{'age': 30, 'name': 'Ronald'},
 {'age': 24, 'name': 'Amelia'},
 {'age': 29, 'name': 'Sally'},
 {'age': 23, 'name': 'Trevor'},
 {'age': 26, 'name': 'Raymond'},
 {'age': 15, 'name': 'Scott'},
 {'age': 28, 'name': 'Jeanette'},
 {'age': 21, 'name': 'Richard'},
 {'age': 15, 'name': 'Callie'}]
"""

from pprint import pprint
users = [
    {"name": "Ronald", "age": 30, "math_score": 93, "science_score": 65, "english_score": 93, "social_score": 92},
    {"name": "Amelia", "age": 24, "math_score": 88, "science_score": 52, "english_score": 78, "social_score": 91},
    {"name": "Nathaniel", "age": 28, "math_score": 48, "science_score": 40, "english_score": 49, "social_score": 91},
    {"name": "Sally", "age": 29, "math_score": 100, "science_score": 69, "english_score": 67, "social_score": 82},
    {"name": "Alexander", "age": 30, "math_score": 69, "science_score": 52, "english_score": 98, "social_score": 44},
    {"name": "Madge", "age": 22, "math_score": 52, "science_score": 63, "english_score": 54, "social_score": 47},
    {"name": "Trevor", "age": 23, "math_score": 89, "science_score": 88, "english_score": 69, "social_score": 93},
    {"name": "Andre", "age": 23, "math_score": 50, "science_score": 56, "english_score": 99, "social_score": 54},
    {"name": "Rodney", "age": 16, "math_score": 66, "science_score": 55, "english_score": 58, "social_score": 43},
    {"name": "Raymond", "age": 26, "math_score": 49, "science_score": 55, "english_score": 95, "social_score": 82},
    {"name": "Scott", "age": 15, "math_score": 85, "science_score": 92, "english_score": 56, "social_score": 85},
    {"name": "Jeanette", "age": 28, "math_score": 48, "science_score": 65, "english_score": 77, "social_score": 94},
    {"name": "Sallie", "age": 25, "math_score": 42, "science_score": 72, "english_score": 95, "social_score": 44},
    {"name": "Richard", "age": 21, "math_score": 71, "science_score": 95, "english_score": 61, "social_score": 59},
    {"name": "Callie", "age": 15, "math_score": 98, "science_score": 50, "english_score": 100, "social_score": 74},]
user_list = []
def get_filter_user(users):
    for i in range(len(users)):
        a = list(users[i].values())[2:6]
        avg = sum(a) /4
        if avg >= 70:
            u_name = users[i]['name']
            u_age = users[i]['age']
            user_list.append({'name':u_name, 'age':u_age})

    return user_list

filter_users = get_filter_user(users)
pprint(filter_users)
"""
[{'age': 30, 'name': 'Ronald'},
 {'age': 24, 'name': 'Amelia'},
 {'age': 29, 'name': 'Sally'},
 {'age': 23, 'name': 'Trevor'},
 {'age': 26, 'name': 'Raymond'},
 {'age': 15, 'name': 'Scott'},
 {'age': 28, 'name': 'Jeanette'},
 {'age': 21, 'name': 'Richard'},
 {'age': 15, 'name': 'Callie'}]
"""

1번과 2번은 쉬웠지만 3번에서 해당하는 딕셔너리에 평균이상을 구하는 것 까지는 했다. 리스트에 딕셔너리를  첨부하는 방법을 구글링을 30분이나 했는데 전혀 몰라서 튜터님에게 물어봤다. list.append()내부에 딕셔너리를 넣을 수 있다는 것 !!!! 정말 생각도 못했다 나는 매일 알고리즘 문제를 풀면서 변수만 넣었는데 저런식으로도 할 수 있다는 것이 놀랬다. 진짜....메소드를 사용할 때 문서를 읽어보라는 것이 이런 말인가 싶기도 하고 저 append사용법을 몰라서 1시간 가까이 헤맸다는게 쪽팔린다...그래도 해결했으니 다행이라고 생각한다!

https://docs.python.org/3/tutorial/datastructures.html

5. Data Structures — Python 3.10.7 documentation