Parisgabriel:python Endless day02

Parisgabriel

basics of getting started with Python Add:Mainstream 3 operating large system WINDOWS:WINXP Win7 Win8 Win10unix:solaris (SUN)

IOS (Apple Mobile)

Mac OS

Linux: (Linux-based UNIX-independent system)

Android (Android)

Ubuntu 16.04 (current teaching version)

Readhat

Centos

Review:

Ctrl + Alt + Enter: Virtual machine Full Screen/exit full screen

Ctrl + Alt: Release mouse

CTRL + SHIFT + "+": Terminal font magnification

CTRL + "-": Terminal font reduction

CTRL + D: exiting the terminal

CTRL + L: Clear screen

CTRL + C: Terminates execution of the current command

CTRL + S: Hide terminal output

CTRL + Q: Restore terminal output

Init 0: Shutting down the machine

Init 6: Restart

PWD: Displays the current path location

LS: See what's in the current location

Ls-l: Display in list form

LS-A: Show All content (contains hidden)

CD: Change the current work path

CD absolute path: cd/home/tarena/aid1806/

CD relative path

Cd.. : Fallback to the top level directory

CD: Back to User home directory

mkdir: Create one or more files

Touch: Create one or more text

Tree: Show Directory tree

Rm-r: Recursively delete all contents in a folder

Rm-f: Force delete without giving any hint

Rm-i: Prompt before deletion (y means yes,n on behalf of NO)

sudo: Execute a command with Superuser root privileges

TAR-ZCVF compressed package name. tar.gz Folder/file: Packed compression

TAR-ZXVF compressed package name. tar.gz [-C Path]: Unpack Package

Z:gzip to compress a package

C: Creating a package Create

X: Unpacking

V: Displays the file details of the operation verbose

F: FileName File

CP: Copy files/folders

MV: Cut/Rename

Exercise 1:

1. Switch to directory:/home/tarena/anaconda3/bin

2. View the current path

3. List all the contents of the current path (including hidden files or directories)

4. Switch to the top-level directory of the current path

5. Switch to/etc directory to see what the/etc content is

6. Switch directly to the user's home directory

Answer:

[Email protected]:~$ cd anaconda3/bin/[email protected]:~/anaconda3/bin$ pwd/home/tarena/anaconda3/bin[email protected]:~/anaconda3/bin$ Ls-la Total dosage 27888drwxrwxr-x  2 tarena tarena   12288 July  . drwxrwxr-x 20 Tarena Tarena    4096 July  2017.. lrwxrwxrwx  1 Tarena tarena       8 July  2to3-2to3-3.6-rwxrwxr-x  1 Tarena tarena     110 July  2to3-3.6-rwxrwxr-x  2 tarena tarena    3802 May  activate-rwxrwxr-x  1 Tarena Tarena     165 July  anaconda-rwxrwxr-x  1 Tarena tarena     167 July  2017 Anaconda-navigator-rwxrwxr-x  1 Tarena tarena     153 July  anaconda-project-rwxrwxr-x  1 Tarena Tarena   12003 July  asadmin[email protected]:~/anaconda3/bin$ CD. [Email protected]:~/anaconda3$ cd etc/[email protected]:~/anaconda3/etc$ lsdbus-1  fish  fonts  jupyter  rc.d[email protected]:~/anaconda3/etc$ CD

　　

Exercise 2:

1. Create directory Mydir1, Mydir2 in user's home directory

2. Create a file under Mydir1: File1, File2, File3

3, Mydir1 packaging compression to mydir1.tar.gz, placed in the user's home directory

4. Cut the mydir1.tar.gz into the Mydir1 directory

5. Unzip the mydir1.tar.gz into the Mydir2 directory (-c option)

Answer :

[email protected]:~$ mkdir mydir1 mydir2[email protected]:~$ cd mydir1[email protected]:~/mydir1$ Touch file1 file2 file3[email protected]:~/mydir1$ CD. [email protected]:~$ TAR-ZCVF mydir1.tar.gz mydir1mydir1/mydir1/file3mydir1/file1mydir1/file2[email                                 protected]:~$ Lsanaconda3 mydir2 Yang document Core my_env public download Examples.desktop pycharm-2017.1.5 template Music Mydir1 Pycharm-professio nal-2017.1.5.tar.gz video Desktop mydir1.tar.gz pycharmprojects pictures [email protected]:~$ mv Mydir1 . tar.gz mydir1[email protected]:~$ cd mydir1[email protected]:~/mydir1$ lsfile1 file2 file3 mydir1.tar.gz[ email protected]:~/mydir1$ TAR-ZXVF mydir1.tar.gz-c ~/mydir2mydir1/mydir1/file3mydir1/file1mydir1/file2[ email protected]:~/mydir1$ CD ~/mydir2[email protected]:~/mydir2$ lsmydir1[email protected]:~/ mydir2$ CD mydir1/[email protected]:~/mydir2/mydir1$ lsfile1 file2 file3[email protected]:~/mydir2/mydir1$  

　　

Exercise 3:

1. Create directory under User's home directory: Ai/python/linux

2. Create files under Linux: Linux1, linux2

3. Create a file under Python: Python1, Python2:

4. Switch to the AI directory to see the current path

5. Switch directly to the user's home directory

Answer :

[Email protected]:~$ mkdir-p ai/python/linux[email protected]:~$ cd ai/python/linux[email protected]:~/AI/python/ linux$ Touch linux1 linux2[email protected]:~/ai/python/linux$ CD. [Email protected]:~/ai/python$ touch python1 python2[email protected]:~/ai/python$ CD ~/ai[email protected]:~/ai$ CD

　　

Exercise 4:

1. Create the following structure in the user's home directory: PYTHON/LINUX/DAY01

2. Create three files under Day01: Day01.txt day02.txt day03.txt

3. Delete the Day03.txt

4. Update the Day02.txt file time to the current time

5. Create the python/base in the user's home directory

6. Create a day01 day02 day03 three folders under base

7. Create a file under Day01 day01.txt

8. Delete all contents in Python/base folder

Answer :

[Email protected]:~$ mkdir-p python/linux/day01[email protected]:~$ cd python/linux/day01[email protected]:~/PYTHON/ linux/day01$ Touch day01.txt day02.txt day03.ttx[email protected]:~/python/linux/day01$ rm-rf day03.txt[email protected]:~/python/linux/day01$ Touch day02.txt[email protected]:~/python/linux/day01$ mkdir-p ~/python/base[email protected]:~/python/linux/day01$ Pwd/home/tarena/python/linux/day01[email protected]:~/python/linux/day01$ Lsday01.txt  day02.txt  day03.ttx[email protected]:~/python/linux/day01$ cd ~/python/base[email protected]:~ /python/base$ mkdir day01 day02 day03[email protected]:~/python/base$ cd day01[email protected]:~/python/base/day01$ Touch day01.txt[email protected]:~/python/base/day01$ cd[email protected]:~$ rm-rf python

One or two binary

1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

0=0 1=1 2=10 3=11 4=100 5=101 6=110 7=111 8=1000 9=1001 .... 127=1111111

Binary algorithm = 2**n-1 Power operation-1

· Decimal integer to binary number: "Divided by 2 to get the remainder, reverse order" (except for the second method)

89÷2 ... 1

44÷2 ... 0

22÷2 ... 0

11÷2 ... 1

5÷2 ... 1

2÷2 ... 0

Decimal integer to octal number:

0 | 004-> 4 | 010=8

001, 1 |005, 5| 011=9

002, 2 |006, 6 | 012=10

003, 3 |007, 7 | 013=11

Decimal integer to hexadecimal number:

0000, 0 0100, 4, 8, 1100, C

0001 1 0101, 5 1001, 9 1101, D

0010, 2 0110, 6 1010, A 1110, E

0011, 3 0111, 7 1011, B 1111, F

Second, the Code

ASCLL Code 255 characters

ASCLL Code table each character occupies a uniform 1 bytes

ASCLL Code table does not support Chinese

The first table supporting Chinese is called GB2312

1980 GB3212 Support 6700+ Word

1995 GBK1.0 Support 20000 words

2000 GB18030 Support 27000 words

Unicode: Universal code (supports all country codes) and a single character occupies 2 bytes uniformly

Because It is inefficient, it is resource-intensive for storage and transport. In order to improve the encoding efficiency of Unicode, a UTF-8 encoding is presented.

UTF-8,

UTF-8 is an extension set of Unicode English accounting for one byte Southeast European countries 2 bytes Chinese 3 bytes

Assic--GB2312---GBK1.0--GB18030

Unicode can be backwards compatible with GB2312, GBK, GB17030
and UTF8 the classification and order is no longer the original sequence encoding

#！ -*-coding:utf-8-*-(declaration using UTF8 encoding)
#codig: utf-8 (declaration using UTF8 encoding)

Print U "I love Beijing Tian ' an gate?" "(U for convert Unicode format) Convert encoded print

Parisgabriel:python Endless day02