變數與資料類型

Python 入門

Hugo Bowne-Anderson

Data Scientist at DataCamp

變數

• 區分大小寫的特定名稱

• 透過變數名呼叫值

• 1.79 公尺 - 68.7 公斤

height = 1.79
weight = 68.7

height

1.79

計算 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

可重現性

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

21.4413

可重現性

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

23.1578

Python 型別

type(bmi)

float

day_of_week = 5
type(day_of_week)

int

Python 型別 (2)

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

type(y)

str

z = True
type(z)

bool

Python 型別 (3)

2 + 3

5

'ab' + 'cd'

'abcd'

• 不同型別 = 不同行為！

一起來練習吧！

Python 入門