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97 lines
1.4 KiB
Markdown
97 lines
1.4 KiB
Markdown
# Python 元组
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> 原文： [https://thepythonguru.com/python-tuples/](https://thepythonguru.com/python-tuples/)
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于 2020 年 1 月 7 日更新
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在 Python 中，元组与列表非常相似，但是一旦创建了元组，就无法添加，删除，替换和重新排序元素。
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**注意**：
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元组是不可变的。
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## 创建一个元组
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```py
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>>> t1 = () # creates an empty tuple with no data
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>>>
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>>> t2 = (11,22,33)
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>>>
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>>> t3 = tuple([1,2,3,4,4]) # tuple from array
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>>>
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>>> t4 = tuple("abc") # tuple from string
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```
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## 元组函数
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* * *
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元组也可以使用`max()`，`min()`，`len()`和`sum()`之类的函数。
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```py
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>>> t1 = (1, 12, 55, 12, 81)
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>>> min(t1)
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1
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>>> max(t1)
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81
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>>> sum(t1)
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161
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>>> len(t1)
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5
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```
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## 元组迭代
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元组可使用`for`循环进行迭代，[在此处了解有关 for 循环的更多信息](/python-loops/)。
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```py
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>>> t = (11,22,33,44,55)
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>>> for i in t:
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... print(i, end=" ")
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>>> 11 22 33 44 55
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```
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## 元组切片
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切片运算符在元组中的作用与在列表和字符串中的作用相同。
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```py
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>>> t = (11,22,33,44,55)
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>>> t[0:2]
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(11,22)
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```
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## `in`和`not in`运算符
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您可以使用`in`和`not in`运算符检查元组中项的存在，如下所示。
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```py
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>>> t = (11,22,33,44,55)
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>>> 22 in t
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True
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>>> 22 not in t
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False
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```
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在下一章中，我们将学习 [python 数据类型转换](/datatype-conversion/)。
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* * *
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