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如何定义一个空元组，请使用两种方式来定义
()
tuple()
定义一个元组，它只有一个数据，数据的值是3
(3,)
定义一个元组，它有多个数据，数据分别是 "hello" "python" "world"
（"hello", "python", "world"）
如何将列表转换为元组，请写出格式
得到的元组 = tuple(列表)
如何将元组转换为列表，请写出格式
得到的列表 = list（元组）
有一个元组stu_tuple，请获取索引值为2的数据
stu_tuple[2]
Appreciated tuples ordered container
And a list of similar tuples are ordered container
Sorted containers can be accommodated store data
Data in the container according to a position order is placed
If the count, from left to right, starting with 0
If the value, you can position the value of the index
Summed up the value of the container and orderly format
有序容器[索引值]
The difference with a list of tuples at
Features of the tuple, data security
For a list, a list of container, it can add data, you can delete data
Tuples can not
It would be a tuple it storing fixed data, the effect is fixed, the data will not be reduced, not increased, it will be unchanged
Tuple is a safe and orderly containers
for example:
python classes to classes, and a month later on classes, small partners Come and register it. . . .
Registration stage, the students can be registered
Registered data
name_list = []
At first no one enrollment, so register is empty
Then, slowly it was coming
Our name_list student's name recorded in the list will slowly become more
Some also is the case, registered students, the sudden cancellation of the registration
These are possible, you can add, you can delete, or modify
Once class begins, namely, classes, and began to class
Class rosters are no longer allowed to change the
After classes, the class will not receive new students to join or support the students leave
Equivalent to that class of persons, has been stabilized, and do not want change happen
Tuple data type, they are suitable for such a scenario
Definition of tuples
Tuple is defined in two ways
t = tuple()
print(type(t), t)
m = ()
print(type(m), m)
Since the additions and deletions to data tuples can not, therefore, empty tuple, there is not much practical significance
Definition of the content of the tuple
- There are multiple definitions of content
元组 = (数据1，数据n)
例如：
t = (1,2,3)
- Only the definition of a data tuple
元组 = (数据1，)
例子
t = (2,)
Tuple values
变量 = 元组[索引值]
Scenarios tuple
Tuple typically used to hold a series of data
user_info = ( "Lu small cloth", 18 "Wuhan", 1.83, [ "singing", "dance", "PK"])
List generally used for the same type of data stored
name_list = [ "Joe Smith", "John Doe", "Wang five"]
Conversion of a list of tuples
A list of turn-tuple
得到的元组 = tuple（列表）
例子
name_tuple = tuple(name_list)
Tuples transfer list
得到的列表 = list(元组)
例子
newdata = list(name_tuple)