Learn python-01 with me.

Description

1. Python Installation

Choose Windows installation, version 3.5.2 2.x version and 3.x version difference is large, the old version does not support the new features

: https://www.python.org/downloads/windows/

Unzip to run when download is complete

Direct Output content:

Print ("Hello Word")

You can write a script and then execute:

c:\users\admin>c:\users\admin\desktop\hello.py

Print ("Hello Word")

Install under Linux, add permissions when executing:

#!/usr/bin/env python env means looking for python under the global path

or use an absolute path

#!/usr/bin/python If you use a high version you can't write dead

2. Python Common programming tools

pycharm-professional-2017.1.4 can be configured inside the template

3, Variable Description:

Declaring variables and getting variables

Name = "Caicai"

Name1 = "Zhenzhen"

Name = "Caicaiaizz"

Print (NAME,NAME1)

Below the overlay above, get to the variable record into memory

4, character encoding problem: Support Chinese need to bring the Utf-8 character set

#!/usr/bin/env python

#-*-Coding:utf-8-*-

Print "Hello, World"

5. Comments

Single-line comment: Using #

Multiline Comment: Use "'" ' 3 quotation marks to start 3 quotes end, single or double quotation marks can be

Multi-line Comment 2 Purpose: comments and Multiline assignment

Msg= ""

Name = "Caicaiaizz"

Print "Hello, World"

‘‘‘

Print (msg)

6. User interaction Input (Note Python version issue)

Using Read-p in the shell

Using input in Python

# _*_coding:utf-8_*_

Username = input ("Username:")

Password = input ("Password:")

Print (Username,password)

-----------------------------------

-----------------------------------

Concatenation of strings: it consumes a lot of memory, it is not recommended

Method One: Use the form of placeholders (common methods)

#From Caichao

Name = input ("Name:")

age = Int (input ("Age:"))

Print (Type (age))

Job = input ("Job:")

info = ""

---------Info of%s--------

name:%s

age:%d

job:%s

"% (Name,name,age,job)

Print (info)

Method Two: Use format for values (used in specific situations)

#From Caichao

Name = input ("Name:")

age = Int (input ("Age:"))

Job = input ("Job:")

info = ""

---------info of {Name}--------

Name:{name}

Age:{age}

Job:{job}

". Format (Name=name,age=age,job=job)

Print (info)

Note:

1), print out the string type of a variable: print (type (age))

2),%s stands for placeholder, starting from 1, and so on

3),%d delegates must use integers for input

4),%f for floating-point string, can enter decimal

5), Fromat the introduction of variables can be

-----------------------------------

7, password in the form of ciphertext input

#From Caichao

# _*_coding:utf-8_*_

Import Getpass

Username = input ("Username:")

Password = getpass.getpass ("Password:")

Print (Username,password)

8, if logic judgment, the user name and password to determine the equal permission to login

#From Caichao

# _*_coding:utf-8_*_

Import Getpass

UserName = "Caicai"

Password = "123"

Username = input ("Username:")

Password = input ("Password:")

if UserName = = UserName and Password = = Password:

Print ("Welcome user {name} login". Format (Name=username))

Else

Print ("Error,please checkout!")

9, multiple if judgment, guess age

#From Caichao

Age_of_oldboy = "56"

Guess_age = input ("Guess Age:")

if guess_age = = Age_of_oldboy:

Print ("Yes!you is Rige")

Elif Guess_age < age_of_oldboy:

Print ("Think smaller!")

Else

Print ("Think bigger")

This article from "Liu" blog, declined reprint!

Learn python-01 with me.