[Python] == 비교, is 비교

파이썬의 값비교, 참조 비교에 대해 알아보자

값 비교 : ==

참조 비교 : is

x = 15
y = 25

print(f'x == y : { x == y}') # 값을 비교
print(f'x is y : { x is y}') # 객체(ID)를 비교

x == y : False
x is y : False

x = ['orange', 'banana', 'apple']
y = x

print(f'x == y : {x == y}')
print(f'x is y : {x is y}')

print(f'x value, id : {x}, {hex(id(x))}')
print(f'y value, id : {y}, {hex(id(y))}')

x == y : True
x is y : True
x value, id : [‘orange’, ‘banana’, ‘apple’], 0x188444eb440
y value, id : [‘orange’, ‘banana’, ‘apple’], 0x188444eb440

x = ['a', 'b', 'c']
y = ['a', 'b', 'c']

print(x == y)
print(x is y)
print(hex(id(x)), hex(id(y)))

True
False
0x188444eb480 0x188444e9880

c = []
d = c
e = c + d

print( d == e)
print(f'{ c is d}')
print(f'{ d is e}')
print(id(c), id(d), id(e))

True
True
False
1684773189312 1684773189312 1684772959552