Python explains how to implement heavy operations on strings

String deduplication is a common requirement for string operations in python. I have encountered it again at work recently, so the following article mainly introduces you to the relevant information about Python's implementation of deduplication operations on strings. The article gives a detailed introduction. Friends who need it can refer to it. Let’s take a look together.

Preface

Recently, I often encounter the deduplication operation on strings at work. Here is a list of how to handle it using Python. Yes, not much to say, let’s take a look at the detailed introduction.

For example, take the following characters and remove the repeated AA, A(B,C)

##S ​​= 'AA, BB, EE, DD, AA , A(B,C), CC, A(B,C)'

##The code is as follows:

Remarks:##   1. Use
str.split(',')

can only be separated by commas; if multiple separations are involved, you need to use

re.split(',|:') 2. The original string is separated by commas separated, followed by one or more strings, so
re.split(', | ')

## 3. Execute re.split(r', | ', S)
After the operation, a large number of '' will be generated in the list, and you need to filter it out

4. Use L.count(x) == 1
or

L.count(x) > 1

to retain duplicates or non-duplicates 5. set(L)
then is to retain the only item in the list, and then use

list()

to convert it into a list 6. Use ', '.join(L)
, splice the list into the string we want

Summary

With the help of regular expressions (re) in python , and operations such as lists, strings, and sets, it is still very flexible to process strings!

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