Basic syntax of Python

Data Valley 2020-11-12 18:31:10
basic syntax python


Python The basic grammar of

“ Life is too short , I use Python”, Today we are going to study Python Basic grammar . It mainly includes the following knowledge points :

1、 Data types and variables

2、 Naming rules

3、 Input and output

4、 Operator

data type

1、 Numeric type (Number)

Python3 Number Support int、float、bool、complex. For the students who have just come into contact with programming , Let me give you an example , Easy to understand data types . for example : double 11 period , As an e-commerce operation platform , The order information sheet will be issued .

The quantity is int type , Unit price can have decimal point, which is floating point type , Whether to pay is only true (True) Or fake (False) The situation of . Belong to bool type .Complex It is seldom used in daily work , It's about solving math related problems , Ignore it for the moment .

2、 character string (String)

Strings are used by Single or double quotation marks in English Lead up .

for example :

‘ Life is too short , I use Python’

‘ The quality of this product is quite good , Express delivery is awesome ’

“ My hometown and I ”

These comments on various platforms can be represented by strings .

3、 list (List)

A list can store a set of data , Through a pair of brackets in English [] encapsulate .

for example : The content of a record in the above order information table is a list .

[20201101,‘ The notebook ’,8000,1,True]

Lists can store a set of data together , Form a record . It's often used in scenes .

Through the above number type 、 character string 、 Use of common types of lists , It can solve most of the work . The key is to choose different scenarios according to different data types .

Variable

As the name suggests, a variable is the amount that can be changed during the running of a program .

for example : Sales performance today 100 ten thousand , Tomorrow, 120 ten thousand . We need to express it in terms of variables .

sales = 100

sales = 120

Among them sales It means variable . according to “=” The data on the right determines sales The values and data types of .

sales = 100, Express the 100 Assign a value to a variable sales,sales It's the name of the variable .

Product names can also be represented by variables .

for example :

Whether the product was purchased successfully

Naming rules

A variable is equivalent to giving each data type a name , Convenient for later use . So variable naming is also standardized . You need to know .

1. Identifiers can be made up of letters 、 Numbers 、 Draw the line down (_) form , The numbers can't start with .

2. Identifier cannot be Python keyword , But you can include keywords .

3. Identifier cannot contain spaces .

4. Case sensitive

Python The key words are as follows :

Input and output

Python Output usage in print() function .

for example :

These are the print() The basic use method . I'm sure you're right print About the initial cognition . We'll explain in detail later .

Python Input in the input() function

for example :

Input function and output function are corresponding to each other , This is mainly a preliminary understanding of input and output , Let's think about the explanation later .

Operator

Python The operators in include arithmetic operators 、 Relational operator 、 Logical operators and assignment operators, etc . This time, let's learn the arithmetic operator first . Including plus 、 reduce 、 ride 、 except 、 Take the rest, etc . Same as the symbols in mathematics .

for example :

I believe that through the above example, we have learned how to use arithmetic operators , We will continue to talk about operators later .

This article is from WeChat official account. - Data Valley (BigDataValley) , author : Wooden Yi

The source and reprint of the original text are detailed in the text , If there is any infringement , Please contact the yunjia_community@tencent.com Delete .

Original publication time : 2020-11-09

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