第四周課堂筆記
1.標準體重
print((170-80)*0.7)
=63
BMI
print((60)/(1.7*1.7))
=20.76......
2.python基本語法:
(1)print("Hi,Taiwan!")
Hi,Taiwan!
(2)if 4>3 :
print("four is greater than three!")
four is greater than three!
(3)x=1
y=Yes
print(x)
print(y)
1
Yes
如果comment的開頭是#，或者是最後放#，那麼python將會忽略它們
ex: print("ok!") #This is a comment
ok!
3.變數
x = 2 # x is of type int
x = "no" # x is now of type str
print(x)
no

x = str(5) # x will be '5'
y = int(5) # y will be 5
z = float(5) # z will be 5.0
print(x)
print(y)
print(z)
5
5
5.0

x = 10
y = "good"
print(type(x))
print(type(y))
<class 'int'>
<class 'str'>

x = "abc"
# is the same as
x = 'abc'
單與雙是一樣的

myvar = "0"
my_var = "0"
_my_var = "0"
myVar = "0"
MYVAR = "0"
myvar2 = "0"

print(myvar)
print(my_var)
print(_my_var)
print(myVar)
print(MYVAR)
print(myvar2)
0
0
0
0
0
0

x, y, z = “A”, “B”, “C”
print(x)
print(y)
print(z)
A
B
C

x=difficult
print("python is"+x)
python is difficult

camel case (駱駝式命名法)
Each word, except the first, starts with a capital letter:
myVariableName = "Jack"

pascal case (帕斯卡命名法)
Each word starts with a capital letter:
MyVariableName = "Jack"

snack case (蛇形命名法)
Each word is separated by an underscore character:
my_variable_name = "Jack"

資料型態:
Text Type: str
Numeric Types: int, float, complex
Sequence Types: list, tuple, range
Mapping Type: dict
Set Types: set, frozenset
Boolean Type: bool
Binary Types: bytes, bytearray, memoryview