First of all, let's learn something about python The most basic entry

1. identifier

Definition : When we write code, we get our own names, such as project names , Package name , Module names, these ;

standard :1. Numbers / Letter / Underline composition , Cannot start with a number

2. You should know the meaning of a name

3. Can't name with a keyword , such as int/if/while etc.

2. notes

① Single-line comments ctrl+/

② Multiline comment Three single quotes ''' ''', Three double quotes """ """

3. Variable

a = 1 # The assignment operation

print(a)# Output function

a It's a variable , Naming rules are the same as identifiers

4. data type

① Numbers : integer 、 floating-point

integer : keyword int give an example : a = 1

floating-point : keyword float give an example b = 10.0

② Boolean value bool boolean

True Flase title case , By judging true or false

③ character string :str

Definition : Become a single quotation mark 、 Double quotes 、 Three orders 、 Double quotes are strings

give an example :a='1'  b="2"  c="""3"""  d='''4.35'''

Can pass python Built in functions type Judgment type

print(type(a))

usage :

Take the string length :

s = ' hello!'

print(len(s))

String values :

# String values : character string [ Index value ]
# Indexes : from 0 Start marker
# take ! Number

s = ' hello!'

s1=s[5]

s2=s[-1]

To be continued , Continue coding tomorrow ~~~

Cute new entry python More articles on basic grammar

  1. [ Python Introductory tutorial ] Python Basic grammar

    Python My grammar is very concise , So with Python The program is readable . Easy to understand . This chapter will introduce Python The basic grammar and concepts of . Python file type 1. Source code .Python The extension of the source code to py ending , It can be shipped directly ...

  2. python Basic grammar 、 data structure 、 Character encoding 、 Document processing Exercises

    Examination scope '''1.python introduction : Programming language related concepts 2.python Basic grammar : Variable . Operator . Process control 3. data structure : Numbers . character string . list . Tuples . Dictionaries . aggregate 4. Character encoding 5. Document processing ''' Examination content 1. Jane ...

  3. 【 turn 】Python Basic grammar

    [ turn ]Python Basic grammar Learn a programming language , It's usually learning the following parts of the language : Basic grammar : Such as , Variable declaration and call . Basic output statement . Code block Syntax . Notes, etc. : data type : It's usually for Numbers . character string . Boolean value . Array ...

  4. python The most powerful of all (2)——python Basic grammar

    Background introduction : Because I have been doing java Development , Also from the txt Start writing hello,world, Use javac Command compilation , All the way to use myeclipse, I know the truth and bitterness ( Please allow me to dry my eyes ), So for pytho ...

  5. Python Basic grammar ( 3、 ... and )

    Python Basic grammar ( 3、 ... and ) -------------------------------------------- Pick up  Python Basic grammar ( Two )------------------------- ...

  6. Python Basic grammar ( Four )

    Python Basic grammar ( Four ) -------------------------------------------- Pick up  Python Basic grammar ( 3、 ... and )------------------------- ...

  7. Python Basic grammar ( Two )

    Python Basic grammar ( Two ) -------------------------------------------- Pick up  Python Basic grammar ( One ) ------------------------ ...

  8. Python Basic grammar

    Python  Basic grammar Python Language and Perl,C and Java There are many similarities between languages . however , There are also some differences . first Python Program E:\Python>python Python 3.3.5 ...

  9. My myna learns Python( Four ): understand Python Basic grammar ( Next )

    Let's go on with the grammar in the first part , Keep learning Python Basic grammar . The data type is basically Python The data types in are divided into the following categories :Number( Numbers ),String( character string ).List( list ).Dictionary( ...

  10. Python Basic grammar ( 3、 ... and )

    Python Basic grammar ( 3、 ... and ) 1. Numerical data structure 1.1 The main points of It was mentioned in the previous blog , Numerical data structure is just introduced here . Here are some knowledge points to know . int.float.complex.bool ...

Random recommendation

  1. Redis And AOF Backup

    redis There are 2 Ways of planting :1.RDB:2.AOF: Now I'm going to talk about ha AOF Backup of 1. find redis.config The configuration file , Most of them download and redis-service Same as catalog : 2. open redie ...

  2. HDU4738 tarjan Cut the edge | Cut the edge 、 Cut point template

    subject :http://acm.hdu.edu.cn/showproblem.php?pid=4738 Pit point : Dealing with double edges The graph may not be connected , To export 0 If the result is 0, Then output 1, Because at least one person has to be sent #inc ...

  3. SQL Server Copy error article collection

    SQL Server Copy error article collection In order to facilitate you in the process of database replication error better solve the problem I collected SQL Server Related to copy error resolution article   The process could not ex ...

  4. 2 、Linux Basic commands -ls-pwd-cd-date-hwclock

    Linux Basic commands : 1.ls- View the documents in the directory grammar : ls Catalog notes : . Current directory  .. Superior directory Such as :ls /etc/ Related parameters : -l   Show details ls /etc/ -l -a Show hidden ...

  5. lintcode:Singleton Single case

    subject : Single case Singleton is one of the most common design patterns . For any moment , If a class only exists and at most one concrete instance exists , So we call this design pattern singleton . for example , about class Mouse ( It's not animal mouse Oh ), We ...

  6. Thousands of downloads a month APP The source code to share

    stay 360 It's been online for a month , More than a thousand downloads . Share the code here , For you to learn ! It also includes teaching you how to access advertising , Make a little money and spend , If you like, please help me , Don't spray when God sees it , Primary school monk just learned Android It didn't take long . Let's start with this app ...

  7. WebService Pass on XML data C#DataSet operation XML analysis WebService Back to XML data

    Webservice The data passed can only be serialized data , Typical is xml data .   /// <summary>         /// By username and password Return the downlink data         /// & ...

  8. How to modify Qt The text of the standard dialog ( for example , Change English to Chinese )

    This article refers to qtcn The forum is made up of , Because words and pictures are organized by myself , So it's still original . http://www.qtcn.org/bbs/read-htm-tid-30650.html http://blog. ...

  9. 0ctf-pwn_warmup-re_mips4

    Warmup(2) The program is very small , Read and write directly through int 80h System call complete . The stack overflow vulnerability is obvious , Can overflow 20 byte . Because of the protection of sandbox, it can only read /home/warmup/flag file . So the thinking is very clear , open ...

  10. In depth understanding of JavaScript Asynchronous series (5)—— async await

    The first part ,ES7 Introduction in async-await Original address  http://www.cnblogs.com/wangfupeng1988/p/6532734.html Without the permission of the author , Shall not be reproduced ~ Described above ...