布尔运算符

Python 中级

Hugo Bowne-Anderson

Data Scientist at DataCamp

and

True and True

True

x = 12

x > 5 and x < 15
# True     True

True

False and True

False

True and False

False

False and False

False

True or True

True

False or True

True

True or False

True

False or False

False

y = 5

y < 7 or y > 13

True

not True

False

not False

True

bmi     # 省略了 bmi 的计算

array([21.852, 20.975, 21.75 , 24.747, 21.441])

bmi > 21

array([True, False, True, True, True], dtype=bool)

bmi < 22

array([True, True, True, False, True], dtype=bool)

bmi > 21 and bmi < 22

ValueError: The truth value of an array with more than one element is 
ambiguous. Use a.any() or a.all()

np.logical_and(bmi > 21, bmi < 22)

array([True, False, True, False, True], dtype=bool)

bmi[np.logical_and(bmi > 21, bmi < 22)]

array([21.852, 21.75, 21.441])

Python 中级