元组的魔法（一）

一般写元组的时候，推荐在最后加入

元组，元索不可被修改，不能被增加或者删除

  1、书写格式

 

2、索引
tu = (111,"alex",(11,22),[(33,44)],True,33,44)
v = tu[0]
print(v)


3、切片

tu = (111,"alex",(11,22),[(33,44)],True,33,44)
v = tu[0:2]
print(v)

4、可以被for循环，可迭代对象

tu = (111,"alex",(11,22),[(33,44)],True,33,44)
for item in tu:
    print(item)

5、转换

s = "asdkljl"
li = ["skljl",123]
tu = (123,123,"asdf")
v = tuple(s)
print(v)

s = "asdkljl"
li = ["skljl",123]
tu = (123,123,"asdf")
v = tuple(li)
print(v)

s = "asdkljl"
li = ["skljl",123]
tu = (123,123,"asdf")
v = list(tu)
print(v)



s = "asdkljl"

li = ["skljl",123]

tu = ("sddff""asdf")

v = "_".join(tu)
print(v)

li = ["salkjl","soiud"]
li.extend((11,22,33))
print(li)

6、元组的一级元索不可修改/删除/增加

元组是有序的

tu = (111,"alex",(11,22),[(33,44)],True,33,44)
v = tu[3][0][0]
print(v)

tu = (111,"alex",(11,22),[(33,44)],True,33,44)
tu[3][0] =567
print(tu)

tu.count(22) ,获取指定元索在元组中出现的次数
tu.index(22)