Python data type of Python collection (2)

@Good 2020-11-12 23:38:55
python data type python collection


    In the collection from the previous section , We get it Python Knowledge of numerical types in data types , In this section we will learn more about Python On the data type of string and boolean type related knowledge .

1. String type

    A string is a sequence of consecutive characters , It can be a collection of all the characters that a computer can represent . stay Python in , Strings belong to immutable series , Single quotes are usually used ‘ ’ Double quotes “ ” Or three quotes “‘ ’” perhaps ““  ”” Cover up . There is no semantic difference between these forms , It's just that there are some differences in form . The single quotation mark 、 The sequence of strings in double quotation marks must be on the same line , The sequence of characters in three quotation marks can be distributed on consecutive lines .

title=' I like the famous aphorism ' # Use single quotes , String content must be on one line 
mot_cn=" It is not the wine of despair that commands us , It's opportunity " # Use double quotes , String content must be on the same line 
# Use three quotes , String content can be distributed over multiple lines .
mot_en="'Our destiny offers not the cup of despair,
but the chance of opportunity. '"

notes : The quotation marks used at the beginning and end of a string must be the same , In addition, when you need to represent a complex string , You can also nest quotes .

  stay Python Strings in also support escape characters . The so-called escape character refers to the use of The backslash \ Escape some special characters .

Escape character explain
\ Line continuation operator
\n A newline
\0 empty
\t Horizontal tabs , Used to jump horizontally to the next tab stop
\" Double quotes
\' Single quotation marks
\\ A backslash
\f Change the page
\0dd Octal number ,dd For the character
\xhh Hexadecimal number ,hh For the character

notes : Prefix the string delimiter with the letter r perhaps R Then the string will be output as is , The escape character will not be used escape .

2. Boolean type

Boolean type is mainly used to represent true and false , stay Python in , identifier true and false Is interpreted as a Boolean value , in addition Python Boolean values in can be converted to numeric values , among true Express 1,false Express 0.

notes :Python Values of boolean type in can be numerically operated , for example :false+1=1, But numerical operations on Boolean values are not recommended .

stay Python in , All objects can be tested for truth , among , Only the cases listed below give false values , Other objects are in if perhaps while All the sentences are expressed as true.

1.false perhaps none

2. The value is zero , Buckle 0 、0.0 、 imaginary number 0

3. Empty sequence , Package string 、 An empty tuple 、 An empty list 、 An empty dictionary

4. Instances of custom objects , The object ___bool___ Method returns false perhaps __len__ Method returns 0.

trivia :

This period of Python The string and Boolean types in the data type of are shared here , We will continue to share in the next issue Python Data type conversion in , Interested friends can pay attention to me .

At the same time, I can also focus on my personal Wechat subscription number , The articles in the garden will be pushed and updated in the subscription number for the first time .

 

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