list1 = [1,'ok',3,'kkk']
s = enumerate(list1)
print(s)#<enumerate object at 0x000002D2CC666DB8>生成一個(gè)枚舉對(duì)象
for i in s:
 print(i)
#(0, 1)
# (1, 'ok')
# (2, 3)
# (3, 'kkk')
data = list(s)
print(data)#[(0, 1), (1, 'ok'), (2, 3), (3, 'kkk')]
 
a = '1+2+3'
print(a)#1+2+3
print(eval(a))#6
b = 'we s s'
# print(eval(b))#報(bào)錯(cuò)，必須是有效表達(dá)式
 
c = 12
d = 24
e = 'sum = c+d'
print(e)#sum = c+d
exec(e)
print(sum)#36
 
def func(x):
 return x>5
list2= [i for i in range(10)]
print(func(6))#True
f_list = filter(func,list2)
print(f_list)#<filter object at 0x000001F8E1DFACC8>返回一個(gè)過(guò)濾器對(duì)象
list3 = list(f_list)
print(list3)#[6, 7, 8, 9]
 
def func1(y):
 if y>5:
  return y*2
list4= [i for i in range(10)]
f_list = filter(func1,list4)
list5 = list(f_list)
print(list5)#[6, 7, 8, 9]
#只進(jìn)行篩選，篩選出來(lái)是什么，返回的就是是什么，不會(huì)改變值
 
def func2(k):
 if k<5:
  return k#返回的是一個(gè)bool值，不會(huì)返回0
list6= [i for i in range(10)]
f_list = filter(func2,list6)
list7 = list(f_list)
print(list7)#[1, 2, 3, 4]
 
def demo(x):
 return x*10
 
list8 = [i for i in range(7)]
s = map(demo,list8)#數(shù)據(jù)必須是可迭代數(shù)據(jù)
 
print(s)#<map object at 0x0000029B113BA288>生成的是一個(gè)map對(duì)象，要查看里面的內(nèi)容要轉(zhuǎn)類(lèi)型
 
list9 = list(s)
print(list9)#[0, 10, 20, 30, 40, 50, 60]
 
 
 
list10 = ['ok','yes','no']
list11 = ['可以','是的','不']
 
a = zip(list10,list11)
print(a)#<zip object at 0x000001A4EE89A688>生成一個(gè)對(duì)象
print(dict(a))#{'ok': '可以', 'yes': '是的', 'no': '不'}也可以直接進(jìn)行操作
#數(shù)據(jù)被操作一次后就不能再進(jìn)行操作
print(list(a))#[]
# list12 = list(a)
# print(list12)#[('ok', '可以'), ('yes', '是的'), ('no', '不')]
# print(dict(list12))#{'ok': '可以', 'yes': '是的', 'no': '不'}
#可以直接轉(zhuǎn)換成字典，有對(duì)象就配對(duì)，沒(méi)有就不配