[Python]If 구문

파이썬의 조건 구문 If에 대해서 알아보자

# 파이썬 제어문 : if

# 기본형식
print(type(True))  # 0이 아닌수, "문자열", [1,2,3...], (1,2,3,...)
print(type(False))  # 0, "", [], (), {} ...

# 예1
if True:
    print("is True")

if 1:
    print("is True")

if (1, 2, 3):
    print("is True")

# 예2
if False:
    print("is Trie")
else:
    print("is False")
print()

# 관계 연산자
# >, >=, <, <=, ==, !=
x = 10
y = 15
print(f'x = {x}, y = {y}')
print(x == y)
print(x != y)
print(x > y)
print(x >= y)
print(x < y)
print(x <= y)
print()

# 예3
city = ""
if city:
    print("You are live in:", city)
else:
    print("please enter your city")

city = "Seoul"
if city:
    print("You are live in:", city)
else:
    print("please enter your city")
print()

# 논리연산자
# and, or, not
a = 55
b = 40
c = 10
print(f'a = {a}, b = {b}, c = {c}')
print('a > b and b > c is', a > b and b > c)
print('a > b or b > c is', a > b or b > c)
print('not a > b is', not a > b)
print(not True)
print(not False)
print()

# 산술, 관계, 논리 우선순위
# 산술 > 관계 > 논리
print('e1 :', 3 + 12 > 7 + 3)
print('e2 :', 5 + 10 * 3 > 7 + 3 * 20)
print('e3 :', 5 + 10 > 3 and 7 + 3 == 10)
print('e4 :', 5 + 10 > 0 and not 7 + 3 == 10)
print()

score1 = 90
score2 = 'A'

# 복수조건을 모두 만족할 때
if score1 >= 90 and score2 == 'A':
    print('Pass')
else:
    print('Fail')
print()

id1 = 'vip'
id2 = 'admin'
grade = 'platinum'

if id1 == 'vip' or id2 == 'admin':
    print('관리자 입장')

if id2 == 'admin' and grade == 'platinum':
    print("최상위 관리자")

print()

# 예4 : 다중조건문
num = 90
if num >= 90:
    print('Grade : A')
elif num >= 80:
    print('Grade : B')
elif num >= 70:
    print('Grade : C')
else:
    print('과락')

# 예5 : 중첩 조건문
grade = 'A'
total = 95
if grade == 'A':
    if total >= 90:
        print('장학금 100%')
    elif total >= 80:
        print('장학금 80%')
    else:
        print('장학금 50%')
else:
    print('장학금 없음')
print()

# in, not in
q = [10, 20, 30]
w = {70, 80, 90, 100}
e = {"name": "jigi", "city": "Seoul", "grade": 'A'}
r = (10, 12, 14)

print(15 in q)  # False
print(90 in w)  # True
print(12 not in r)  # False
print("name" in e)  # True
print("Seoul" in e.values())  # True

결과 :

<class 'bool'>
<class 'bool'>
is True
is True
is True
is False

x = 10, y = 15
False
True
False
False
True
True

please enter your city
You are live in: Seoul

a = 55, b = 40, c = 10
a > b and b > c is True
a > b or b > c is True
not a > b is False
False
True

e1 : True
e2 : False
e3 : True
e4 : False

Pass

관리자 입장
최상위 관리자

Grade : A
장학금 100%

False
True
False
True
True