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Python series tutorials 116
2022-01-29 10:57:49 【AI technology of artificial intelligence】
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Statement ： During the teaching of artificial intelligence technology , Many students mentioned to me python Related issues , So in order to let the students master more extended knowledge and better understand AI technology , I put the assistant in charge of sharing this python Series of tutorials , I hope that helps ！ Because of this python The tutorial wasn't written by me , So it's not as good as mine AI Technology teaching is humorous , It's boring to learn ; But its knowledge is in place , It's also worth reading ！PS： If you don't understand this article, please read the previous article first , Step by step, learn a little everyday, and you won't find it difficult ！
Tuples are very similar to lists , But tuples cannot be modified in place （ They are immutable ）, And usually written in parentheses （ Not in square brackets ）. Although tuples do not support any method calls , But tuples have most of the properties of a list . Let's take a quick look at its properties .
- An ordered set of arbitrary objects
Similar to strings and lists , A tuple is a collection of ordered objects （ That is, its contents are maintained in order from left to right ）. Same as the list , Can contain objects of any category .
- Access by offset
With the string 、 The list is the same , Elements in tuples are offset （ Rather than a key ） To visit . They support all offset based operations . for example , Index and slice .
- It belongs to the immutable sequence type
Similar to string , Tuples are immutable , They do not support operations that are applied to the list and modified in place . Similar to strings and lists , Tuples are sequences , They support many of the same operations .
- Fixed length 、 isomerism 、 Any nesting
Because tuples are immutable , Cannot grow or shorten without generating a copy . On the other hand , Tuples can contain other composite objects （ for example , list 、 Dictionaries and other tuples ）, So nesting is supported .
- Object reference array
Similar to list , Elements in tuples contain references to objects . Tuples store access points to other objects （ quote ）, thus , Indexing tuples is relatively fast .
Later, we will learn tuples in more detail step by step ！
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