What is a tuple?

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Original white series of 8 Pian

White: by previous articles I know what is the list of operations. So, what is a tuple it?

Small yards brother: Today we talk about together tuples.

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What is a tuple?

List data structure can be modified, and the tuple is a fixed length, the data structure can not be modified element value.

Tuple using parentheses () indicates, the list using square brackets []. Please note the difference.

grammar:

Tuple name = ( element 1 , element 2, .......)

Tuple easiest way to create some of the values are separated by commas, the tuple is automatically created;

Most of the time the tuple is enclosed by parentheses; null set may contain no parentheses to represent; contains only one value tuple must add a comma (,);

example

tup1 = 1,2,3tup2 = "Python","Java"# 创建元组tup3 = (1,2,3,4)# 创建空元组tup4 = ()# 只有一个元素的元组tup5 = (1,)# 不是元组，是一个整型数字tup6 = (1)print(tup1)print(tup2)print(tup3)print(tup4)print(tup5)print(tup6)print(type(tup6))

(1, 2, 3)

('Python', 'Java')

(1, 2, 3, 4)

()

(1,)

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创建元组的方法？

Python中的tuple()函数也可以创建元组，将任意序列或迭代器放在该函数内即可。

注意该函数只接受任意序列或迭代器，比如不能是数字的组合

例子tuple(1,2,3)。在Python编程中，我们经常使用tuple() 把列表变成元组。

另外，我们还可以通过双层圆括号创建元组的元组。

# 使用tuple()函数创建元组tup2_tuple = tuple('Python')print(tup2_tuple)tup3_tuple = tuple(['Python','Java','C++'])print(tup3_tuple)# 构造元组的元组tup7 = (1, 2, 3, 4),('Python','Java')print('创建元组的元组:',tup7)# 使用tuple()函数创建元组的元组tup_tuple = ((1, 2, 3, 4),('Python','Java'))print('使用tuple函数创建元组:',tup_tuple)

('P', 'y', 't', 'h', 'o', 'n')

('Python', 'Java', 'C++')

创建元组的元组: ((1, 2, 3, 4), ('Python', 'Java'))

使用tuple函数创建元组: ((1, 2, 3, 4), ('Python', 'Java'))

我们还可以通过加号（+）把多个元组拼接在一起，形成更长的元组；

也可以使用乘号（*）复制多份同样的元组。

# 通过 + 生成更长的元组tup8 = (1, 2, 3, 4) + ('Python', 'Java', 5) + ('C++',)print('通过 + 生成更长的元组',tup8)# 通过 * 生成多份同样的元组tup9 = ('Python','Java') * 3print('通过 * 生成多份同样的元组', tup9)

By + generating a longer tuple (1, 2, 3, 4 , 'Python', 'Java', 5, 'C ++')

By * generating multiple copies of the same tuple ( 'Python', 'Java' , 'Python', 'Java', 'Python', 'Java')

Above excerpt from "zero-based Easy Python"

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