Python 01 Basics

Video URL: https: //www.bilibili.com/video/av71299046

Video content

Preliminary understanding of computer
Interpreter installation
IDE installation, assembly code software: Pycharm
Getting python

Content Details

1. Computer preliminary understanding

Common operating systems

win
- win7
- win10
- window server
linux
- centos, graphical interface difference
- ubuntu, personal development (graphical better)
- redhat, Enterprise
mac, (in the how to play before the entry mac, mac) office

Learn programming language

Quasi mounting machine explained compiled
Learning grammar

2. interpreter installation

1. Download the interpreter URL: https: //www.python.org/downloads/windows/

3. The first script

The first script (a file)

Turn on the computer terminal, a function key + R
Enter the command: path to the script interpreter path (recommended .py suffix)

4. encoding

1. acquaintance coding

graph TD ascii code unicode Unicode Utf-8 code

ascii English, 8 represent a thing, 2 ** 8
unicode Unicode, 32 represent a thing, 2 ** 32
Utf-8 to unicode compression, exhaustion digits represent less of a thing, to 8-bit units

eight byte ASCII 1 = 4 bytes = 32-bit Unicode utf-8 with a minimum of 1 byte = 8 bits, with up to 4 bytes = 32 bits is shown. Chinese: 3 bytes = 24 represents

2.Python interpreter coding

Python2: ascii, plus the file header:

# -*- coding:utf-8 -*-

print('你好')

Python3：Utf-8

3. file encoding recommendations: When writing a file, save the file to use utf-8 format. What to save coding, it is necessary to open what encoding, or garbled

notepad ++ Download: http: //www.notepad-plus-plus.org/downloads/

6. Interpreter

#！/usr/bin/env python
# -*- coding:utf-8 -*-

print('你好')

Invalid on the system's first line win, only for linux system file: a.py run: interpreter file path has a special method of execution on linux:

Give permission to an executable file
./a.py automatically find the first row = / usr / bin / env / python a.py

7. Output

print(你想输出的内容)

Special: py2: print 'Hello' py3: print ( 'Hello')

8. Data Type

'alex'/"李杰"  字符串
666  数字/整型
True/False  布尔类型

1. String

apostrophe
Double quotes
Three marks in the internal text may wrap py

2. 3. Integer Boolean

9. Variable

content='物鱼要刀鱼,刀鱼要到岛上钓'
content=666
print(content)

Requirements variables

Variable names can only contain: letter / number / underscore
The numbers do not begin with
You can not be a python keyword
Suggest
- See known name meaning: name = "alex" age = 18
- Underlined the connection: alex dad = "WU"

Supplementary: AlexDad = 'Wu Pei Mika (camel named, not recommended)

10. Exercises

第一题
age = 18
new_age = age+1
print(new_age)

第二题
name = "alex"
new_name = name + 'sb'
print(new_name)

第三题
age = "666"
new_abe = age +"666"
print(new_age)

第四题
age = 666
new_age = age+666
print(new_age)    # 报错

第五题
age = 6
new_age = age * 2
print(new_age)

第六题(特殊)
name="alex"
new_name=name *2
print(new_name)

第七题
age = 18
value = age >=19
print(value)

第八题
_ = 9
gname = 'allex'
True = 9    #错误
print = 666    #错误

11. Enter

user_name = Input("请输入你的姓名:")
message = user_name + "烧饼"
print(message)

Note: the contents of the input water input to get a string of far-py version differences:

py2: name = raw_input ( "Please enter your name")
py3: name = input ( "Please enter your name")

示例：
user_nane = input("请输入你的姓名:")
password = input("请输入你的出码:")

content="你的用户名是:"+ user_nase+"你的密码是:"+password
print(content)

12. Notes

"" "Multiline comments" "" #-line comment

13. Analyzing conditions

#单项判断
if :

#双向判断
if :
else:

多项判断
if:
elif:
else:

Examples of supplements

#用户名密码登陆
username=input('请输入用户名:')
password=input('请输入出码:')
If username =="alex"and password=="oldboy"
    print('欢迎登陆')
else:
    print("用户名或密码错误")

Python 01DAY Basics