Basic types of Python

Objective:

What is code?

Code is the mapping of real-world things in the computer world.

What do you write code for?

Writing code is to describe things in the real world in a computer language.

One, number: shaping and floating-point type

Integral type: int

Float type: float (no single and double precision points)

Special note that 2/2=1.0 get float result 2//2=1 get is int result

Binary, 10, 2, 8, 16

Three, the representation and transformation of the system

OB indicates 2 binary 0B10 =2

0o = 8 binary 0o10=8

0x = 16 binary 0x10=16

Bin () can convert any number of bytes into binary bin (0x10) = ' 0b10000 '

int () converts any number of bytes into a decimal int (0x10) =16

Hex () converts any number of bytes into hex hex (+) = ' 0x10 '

The Oct () can convert any number of bytes into an octal Oct (8) = ' 0o10 '

Iv. Boolean types and complex numbers

BOOL Boolean type: Denotes True and false

Complex complex J denotes 36j

BOOL (0), BOOL ("), bool ([]), BOOL ({}), bool (None) are False

Five, single quotes and double quotes, three quotation marks (in English)

"Let's go" = ' let\ 's go ' = ' Let's Go '

"Content"

Six, escape character

Special characters

Characters that cannot be "seen"

Characters that are conflicting with the language itself syntax

\ nthe line break

\ ' Single quotation mark

\ t Transverse tab

Seven, original string

When an R is prepended to a string, it is not a normal string, but a primitive string

Print (R ' c:\no\nother ') output: C:\no\nother

Eight, string arithmetic

+ string concatenation

* String multiplication ' Hello world ' *2= ' Hello Worldhello world '

String index ' Hello World ' [1] = ' e ' or ' Hello Worldhello world ' [ -5]= ' W '

Intercept string ' Hello World ' [0:2]= ' he '

Basic types of Python