Python常用函式

name = input('請輸入你的姓名：')

s1 = 'taibai'

print(s1.upper()) >>>>>taibai

a = range(9)

print(a)
>>>>>range(0, 9)

for i in range(5):

print(i)
>>>>0
1 23 4

for i in range(1,7,2):

print(i)
>>>>1 3 5
for i in range(2,-2,-1):
print(i)
>>>>2 1 0 -1

a = range(0,5)   

print(a)
pyrhon2中返回的結果是： [0,1,2,3,4]
python3中返回的結果是： (0,5)

l1 = ("a", "b", "c")

for i in enumerate(l1):
print(i)
>>>>>(0, 'a')
(1, 'b')
(2, 'c')

print ("{} {}".format("hello", "world"))

>>>hello world ###不設定指定位置，預設排序
print (" ".format("hello", "world"))
>>>hello world hello ###按照索引指定位置
s = "alexwusir"
print(s1)

name = "   alex lenb   "

print(name.strip()) >>>>alex lenb
name1 = "00000alex0000"
print(name1.strip('0')) >>>>>alex

a = "alex:alex123"

print(a.split(":")) >>>>['alex', 'alex123'] 
print(a.split("l",1)) >>>>['a','lexalex123'] 
print(a.split(":")[0]) >>>>alex
print(a.split(":")[1]) >>>>alex123

b = "dlrblist"

b1 = b.rsplit("l", 1)
print(b1) #['dlrb', 'ist']
b = "dlrblist"
b2 = b.rsplit("l", 2)
print(b2) #['d', 'rb', 'ist']

c = "hello\nworld\ndlrb"

c1 = c.splitlines()
print(c1) #['hello', 'world', 'dlrb']

print(int("0b1111011",2))     #將2進製轉換成十進位制

print(oct(30))  >>>0o36

print(hex(87))   >>>>0x57

li = ["alex", "wusir", "taibai"]

a = "_".join(li)
print(a) >>>>alex_wusir_taibai
lst = ["asd","1231","asdasd"]
print("".join(lst))
>>>asd1231asdasd

a = 10

b = 10
c = 20
print(id(a), id(b), id(c))
>>>>140726332256800 140726332256800 140726332257120

a = 10000

b = 10
print(a.bit_length(),b.bit_length())
>>>>14 4

s = "你好"

s1 = s.encode("utf-8") # 編碼
print(s1)
>>>>b'\xe4\xbd\xa0\xe5\xa5\xbd'
s2 = s1.decode("utf-8") # 解碼
print(s2)
>>>>你好

lst = [11,22,33,44]

for i in enumerate(lst):
print(i)
>>>(0, 11)
(1, 22)
(2, 33)
(3, 44)

print(bin(10))    # 十進位制轉成二進位制

print(oct(10)) # 十進位制轉成八進位制
print(hex(30)) # 十進位制轉成十六進製制
print(int("0x1e",16))
print(int("0o12",8))
print(int("0b1010",2))

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