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Teach you seven techniques for Python string processing

Y2J

Release： 2017-04-20 09:10:00

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This article mainly introduces you to seven techniques for learning Python string processing, including string concatenation and merging, string slicing and multiplication, string division, and the beginning and end of strings. Friends who need it can refer to operations such as processing, searching and matching of strings, replacing strings, and removing some characters from strings.

Preface

Daily use of python often requires text processing, whether it is crawler data analysis, big data text cleaning, or Ordinary file processing requires the use of strings. Python has many built-in efficient functions for string processing, which are very convenient and powerful. Here are 7 commonly used tricks that I have summarized. With these tricks, you can easily Dealing with string processing.

1. String concatenation and merging

##Connection and merging

Add //Two strings can be easily connected through '+'

Teach you seven techniques for Python string processing

Merge //Use the join method

Teach you seven techniques for Python string processing

2. String slicing and multiplication

Multiplication//For example, when writing code, it is easy to use delimiters when using python Implement

line=&#39;*&#39;*30

print(line)

>>******************************

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Slicing

Teach you seven techniques for Python string processing

3. String Split

Ordinary splitting, using split

split can only do very simple splitting, and does not support multiple splits

phone=&#39;400-800-800-1234&#39;

print(phone.split(&#39;-&#39;))

>>[&#39;400&#39;, &#39;800&#39;, &#39;800&#39;, &#39;1234&#39;]

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Complex splitting

r means no escaping, the delimiter can be; or, or a space followed by 0 or more extra Space, and then split according to this pattern

Teach you seven techniques for Python string processing

4. Processing of the beginning and end of the string

For example, we want to check what the name of a file begins or ends with

filename=&#39;trace.h&#39;

print(filename.endswith(&#39;h&#39;))

>>True

print(filename.startswith(&#39;trace&#39;))

>>True

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5. Searching and matching strings

General search

We can easily search for substrings in long strings, and the index of the location of the substring will be returned. If found Not returning -1

Teach you seven techniques for Python string processing

Complex match

Teach you seven techniques for Python string processing

6. Replacement of strings

Ordinary replacement // Just use replace

Teach you seven techniques for Python string processing

Complex replacement // To handle For complex or multiple replacements, you need to use the sub function of the re module

Teach you seven techniques for Python string processing

## 7. Remove some characters from the stringRemove spaces //When processing text, for example, reading a line from a file, then you need to remove spaces, tables or newline characters on both sides of each line

line=&#39; Congratulations, you guessed it. &#39;

print(line.strip())

>>Congratulations, you guessed it.

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Note:The spaces inside the string cannot be removed. If you want to remove it, you need to use the re moduleFor complex text cleaning, you can use

str.translate

,First build a conversion table. The table is a translation table, which means converting 't''o' into uppercase 'T' 'O',

Then remove '12345' from old_str, and then the remaining string is translated through table

Teach you seven techniques for Python string processing

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