变量与类型

Python 入门

Hugo Bowne-Anderson

Data Scientist at DataCamp

变量

• 区分大小写的特定名称

• 通过变量名调用值

• 1.79 米 - 68.7 千克

height = 1.79
weight = 68.7

height

1.79

计算 BMI

height = 1.79
weight = 68.7

height

1.79

$$ \text{BMI} = \frac{\text{weight}}{\text{height}^2} $$

68.7 / 1.79 ** 2

21.4413

weight / height ** 2

21.4413

bmi = weight / height ** 2
bmi

21.4413

可再现

height = 1.79
weight = 68.7
bmi = weight / height ** 2
print(bmi)

21.4413

可复现性

height = 1.79
weight = 74.2 # <-
bmi = weight / height ** 2
print(bmi)

23.1578

Python 类型

type(bmi)

float

day_of_week = 5
type(day_of_week)

int

Python 类型 (2)

x = "body mass index"
y = 'this works too'

type(y)

str

z = True
type(z)

bool

Python 类型 (3)

2 + 3

5

'ab' + 'cd'

'abcd'

• 不同类型 = 不同行为！

动手练一练！

Python 入门