python内置函數

取絕對值
a = abs(-95)
print(a)


值有一個為假，就全為假
a = all([True,True,False])
print(a)

有一個為真，就全為真
a = any([False,True,True])
print(a)


傳回一個可列印的對象字元串方式表示
a = ascii('0x\10000')
b = ascii('b\x19')
print(a,b)

将整數轉換成二進制字元串
a= bin(95)
print(a)

将以個資料轉換成8進制
a = oct(95)
print(a)

将一個資料轉成十進制
a = int(95)
print(a)

将整數轉換成十六進制字元串
a = hex(95)
print(type(a))


轉為布爾類型
a = bool("")
print(a)

轉換成位元組形式bytes
a = bytes("吳永聰",encoding='utf-8')
print(a)

chr傳回一個字元串，其ascii碼是一個整形，比如chr(97)傳回字元串穿"a",桉樹i的範圍在0-255之間。
a = chr(88)
print(a)


ord參數是一個ascii字元，傳回值是一個對應的十進制整數
a = ord("X")
print(a)

建立資料字典
ret = dict({"wyc":2,"two":3})
dict(zip(("one","two"),(2,3)))
dict(one=2,two=1)
print(ret)


dir列出某個類型的所有可用方法
a = dir(list)
print(a)

help檢視幫助文檔
ret = help(list)
print(ret)

分别取商和餘數
a = divmod(9,5)
print(a)

#計算表達式的值
a = eval('1+2*5')
print(a)

exec用來執行存儲在字元串或檔案中的python語句
ret = exec(print("Hi,girl."))
print(ret)

filter 過濾
li = [1,2,3,4,5,6,7]
a = filter(lambda x:x>3,li)
print(a)

float浮點型
a = float(1)
print(a)

判斷對象是不是屬于int實列,傳回True和False
a = 5
b = isinstance(a,int)
print(b)

globals    傳回全局變量
locals     傳回目前局部變量
name = "wyc"
def h1():
    a = 1
    print(locals())
h1()
print(globals())

map周遊序列，對序列中每個元素進行操作，最終擷取新的序列
li = [11,22,33]
def func1(arg):
    return arg + 1
new_list = map(func1,li)
for i in new_list:print(i)

max 傳回集合中的最大值   max
min  傳回集合中的最小值     min
a = [1,2,3,4,5,6,7]
s = max(a)
n = min(a)
print(s,n)

pow 傳回x的y次幂
a = pow(2,10)
print(a)
t = pow(2,10,100)
print(t)

round  四舍五入
a = round(9.5)
print(a)

sorted  隊集合排序
char = ["吳","123","1","25","a","b","c"]
new_chat = sorted(char)
print(new_chat)
for i in new_chat:
    print(bytes(i,encoding='utf-8'))

sum求和的内容
a = sum([1,2,3,4,5])
print(a)
a = sum(range(6))
print(a)

__import__通過字元串的形式，導入子產品
comm = input("Please:")
ccas = __import__(comm)
ccas.f1()

#需要做拼接時後加  fromlist=True
m = __import__("lib."+comm,fromlist=True)
print(m)