Python_ Basic section (1)

1th Python Introduction 1.1 Basic introduction

L Code: The code appears to solve the problems in life

l Compiler Interpreter: The purpose is to have the interpreter translate the code into a computer-readable language

L Programming Languages: languages written in accordance with certain rules,

C Language and other

-Machine code: C

-byte code: Other

L Compile type and explanatory type

1.2 Python advantages

L CPython Common side conversion byte side run

L PyPy run the fastest after converting to bytecode

L Python is not only simple, but also full-class library

Summary: Install the interpreter to learn the language rules to write code to explain its run interpretation Python version

2nd Chapter Installation Pycharm

1) Select new environment using

2) Choose a second existing interpreter

3) Select Python path

2.3 Editing templates

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

The 3rd Chapter Hello word3.1 Exercises:

Rooster 5 Text Money One, hen 3 text Money A, Chick 3 only a penny, with 100 text money to buy 100 chickens, which cocks, hens, chickens must have, ask the rooster, hen, chicken to buy how many just just fill up 100 money?

"""
5* Cocks < 100
100 Hen <
1* Chick < 300
Rooster + hen + chick = 1000
"""
For I inrange (1, 21):
For x in range (1, 34):
For y in range (1, 301):
score= I * 5 +x * 3 + Y/3
If score = = 100:
Print (' rooster%s only, hen%s only, chick%s only '% (i,x,y))
Print (' Hello word ')

4th Chapter 4.1 Coded Information table

Coding	Bytes	Representation/bit	Accommodate	Use case
Ascii	1	00000010	256	Use 1 bytes = 8 bits to represent everything the computer can express.
Unicode	4	00000000 00000000 00000000 00000010	4294967296	Universal code, with 4 bytes = 32 bits To do the correspondence relationship
UTF-8	3	10000000 00010000 00011010	16777216	Compress the universal code, using at least 1 bytes to represent
GBK	2	00000000 00000010	65536	Correspondence to the writing of Asian countries PS: Chinese 2 bytes = 16 bits

4.2 Python2/python3 Differences:

L PY2: Interpreter default encoding ASCII

#-*-coding:utf-8-*-Interpreter default encoding Utf-8

Print (' King Crape Myrtle ')

L PY3: Interpreter default encoding Utf-8

Print (' Going to sleep ')

L PY2/PY3

#-*-CODING:GBK-*-

Print (' Going to sleep ')

5th Chapter Input Output 5.1 Print/input

Output:

Print ("You are the wind I am the Sand")

Input:

User =input ("Please enter your username:")

Ciphertext transmission:

Importgetpass

PWD =getpass.getpass ("Please enter password:")

The 6th Chapter Variable 6.1 format:

Example: variable name = value

User_name = [' Harry ',' Zhang San ']
Print(user_name)

6.2 Specifications:

L numbers, letters, underscores

L cannot start with a number

L cannot use Python's keywords

l See names and know the meaning; user_pwd = "XXX"

7th Common data Type 7.1 integers

age= 18

String:

Name= "Crape Myrtle"

# Get Violet

n1= Name[0]

N2= Name[1]

7.2 List

user_list= ["Crape Myrtle", "Er Kang", "18", "Mass", "Chick")

n3= User_list[0]

n4= user_list[1] # "Er Kang"

user_list= ["Crape Myrtle", "Er Kang", "18", "Mass", "Chick")

Forxxx in User_list:

Print (XXX)

Ifxxx = = ' 18 ':

Break

7.3 Dictionaries

user_info= {"name": "Crape Myrtle", "Age": 18}

n5= user_info["Name"]

n6= user_info["Age"]

user_info[' Count ']= 666

#{"name": "Crape Myrtle", "age": +, "Count": 666}

8th. Conditional Statement 8.1 Exercise: 10086 Smart Service Reminders

msg = "" "
    Welcome Call 10086
       1. Check your charges
        2. Check the water meter
       3. Human Services
       ""
chose = input (" >> Please enter the service to be queried ")
if chose = = ' 1 ':
    print (" 1. Query this machine 2. Inquire about other people's phones 3. Query traffic ")
    CHOSE_XIANMU = input (">> Please enter project")
    Ifchose_xianmu = = ' 1 ':
         Print ("Query this Machine")
    Elifchose_xianmu = = ' 2 ':
         print ("Find someone else's phone")
    elif  chose_xianmu== ' 3 ':
         print (' Query traffic ')
    else:
        print ( ' re-enter ')
elif chose== ' 2 ':
    print ("Query water meter")

elif chose== ' 3 ':
    Print ("Human Services")
Else:
    print ("re-enter")

8.2 Exercise: Enter a user name

# username = input (">> Please enter user name:")
# password = input (">> Please enter password:")
# number= 10
# if Username = = "Wang" and password = = str (123):
# print ("Login Successful")
# Else:
# Print ("Failed")

The 9th Chapter 9.1 Break/continu Difference of circular statement

L break-Terminates the current loop

L continu-Skip this cycle and continue the next cycle.

9.2 Exercise: Break

Count = 1

While True:

Print (count)

Count =count + 1

If count== 11:

Break

Count = 1

While True:

Print (count)

If count== 10:

Break

Count =count + 1

Count = 1

While True:

Print (count)

If count== 10:

Break

Count+=1

9.3 Exercise: Continu

# Output 1-10 on page, exclude

Method One:

Count = 1

While Count < 11:

If count== 7:

Count+=1

Continue

Print (count)

Count+=1

Method Two:

Count = 1

While Count < 11:

If count== 7:

Pass

Else

Print (count)

Count+=1

10th. Data type nesting 10.1 lists nested with each other

List =["Wang", "Xiao", [11,22,33]

N=LIST[1]

M=LIST[2][1]

Print (n)

Print (m)

Output:

c:\python3\python.exed:/python/untitled2/lianxi/1.py

Xiao

22

10.2 List Dictionary Nesting

List = [

"Wang",

{' name ': ' Xiao ', ' age ': 18},

[11,22,33]

]

list[1]["Age"]=20

Print (list)

Output

C:\python3\python.exe d:/python/untitled2/lianxi/1.py

[' Wang ', {' name ': ' Xiao ', ' Age ': 20}, [11, 22, 33]]

The 11th chapter of this week supplements: 11.1 Getpass

Getpass.getpass ciphertext input cannot be run in Python3, only at terminal

Import Getpass

Password = getpass.getpass (' >> enter password ')

if usname = = ' Wang ' and password = = 123:

Print ("OK")

Else

Print (' No ')

11.2 Input

Python3

user = input (' Please enter: ')

Python2

user = Raw_input (' Please enter user name: ')

Python_ Basic section (1)