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1. Indexing and acquisition of strings

Strings are indexed in the same way as lists. It's just that the list has an index position for each element itself, and the string has an index position for each character.

The index rule is the same as the list

The slice and index are fetched the same as the list

Cannot modify and delete through index (string cannot be modified)

Examples are as follows:

Name = 'Adem'print (name [0]) print (name [- 1])

The implementation results are as follows:

> > A

> > m

2. Find and index functions of string

The function of find and index function: get the index position of the element

The usage of find and index functions:

String.index (item)-> item: query the number of elements and return the index location

String.find (item)-> item: query the number of elements and return the index location

The difference between the find and index functions:

If find cannot get it, it returns-1.

If the index is not available, it will report an error directly.

Examples are as follows:

Info ='My name is Neo'print (info.find ('Neo')) print (info.index (' Neo'))

The implementation results are as follows:

> 11

> 11

Info ='My name is Neo'print (info.find ('Jack')) print (info.index (' Jack'))

The implementation results are as follows:

>-1

> ValueError: substring not found

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