內置函數補充

一：all和any

all和any
若是是空可迭代對象(字符串，列表，字典，元祖)，返回True
裏面傳入的是可迭代對象,(字符串，列表，字典，元祖)可迭代對象裏面不能是空，若是是空，返回False

1 all和any
# print(all(['sb',0]))
# print(all([]))
# print(all(()))
# print(all({}))
# print(all(''))
# print(any(['',1],))
#
# 裏面傳入的是可迭代對象,(字符串，列表，字典，元祖)可迭代對象裏面不能是空，若是是空，返回False
# 若是是空可迭代對象(字符串，列表，字典，元祖)，返回True

2
# 輸入字符串返回編碼位置
# print(ord('我'))
3
# 輸入一個編碼位置，返回字符串
# print(chr(25105))
4
# repr 返回裏面是什麼就是什麼，必須跟着可迭代對象  原形畢露
# %r
# print(repr('[alex]'))
# name='alex%r'%('_sb')
# print(name)
5
# slice 有返回值，可設置起始值  切片
# l=[1,2,3,4]
# print(slice(1,l[1::]))
# slice
# l1 = [11,22,33,44]
# print(l1[1::2])
# sl = slice(1,4,2)
# print(l1[sl])

6
# reversed('我是可迭代對象,返回迭代器') l2=reversed(l1)
# l1 = [11,33,22,44,'alex']
# # l1.reverse()
# # print(l1)
# l2=reversed(l1)
# print(l2)
# for i in reversed(l1):
#     print(i)

7
# dic = {'k1':20,'k2':30,'k3':100}
# def func(x):
#     return dic[x]
# l1 = max(dic,key=func,)
# print(l1)

# dic = {3:20,2:30,1:100}
# def func(x):
#     return x
# l1 = max(dic,key=func,)
# print(l1)
# 
8
# zip拉鍊 將可迭代對象最少的爲基準，可放多個對象，一一對應，返回一個元祖
#  from collections import Iterator
# l1 = [1,2,3,4,5]
# l2 = ['wusir','alex','taibai']
# l3 = ['*',"**"]
# print(zip(l1,l2))
# print(isinstance(zip(l1,l2),Iterator))
# for i in zip(l1,l2,l3):
#     print(i)

9
#map
#[i*i for i in range(5)]
# print([i*i for i in range(5)])
# print(map(abs,[1,2,3,-4,-5,-7]))
# for i in map(abs,[1,2,3,-4,-5,-7]):
#     print(i)
# def func(x):return x*x
# for i in map(func,range(5)):
#     print(i)
# def func(x):return x*x
# for i in map(func,[0,1,2,3,4]):
#     print(i)

10
#filter 過濾
# [i for i in [1,2,3,4,5] if i % 2 == 0]
# def func1(x):return x % 2 == 0
# for i in filter(func1,[1,2,3,4,5]):
#     print(i)
11
#sorted  返回的是列表
#造成一個新列表,並返回
#與list.sort()  改變原列表
# l1 = [1,4,3,5,7,8]
# print(sorted(l1,))
# print(l1)
# l = ['fsdafsa','fddsaf','qqq','fgasjdlg;dsjfg']
# # def func1(x):
# #   return len(x)
# # for i in sorted(l,key=func1):
# #     print(i)
# print(sorted(l,key=len))