The path to learning Python

Python interpreter:

CPython is most commonly used, but is slightly slower than other interpreters, but the user does not perceive

PyPy fast Speed interpreter

JythonJython is a python interpreter running on the Java platform that compiles python code directly to Java byte code execution. Infrequently, if you want to interact with the Java or . Net Platform, the best approach is not to use Jython or IronPython, instead of interacting with the network, to ensure the independence of each program.

Windows Configuration environment variable: (or when installing, tick add python variable also line)

"Right-click Computer"--"Properties"--"Advanced system Settings"--"advanced"--"Environment variable" --"In the second content box, find a row with the variable named Path , double -click The Python installation directory is appended to the variable value;

The Python script has to be executed

Windows:

650) this.width=650; "width=" 166 "height=" 265 "src="/e/u261/themes/default/images/spacer.gif "style=" Background:url ("/e/u261/lang/zh-cn/images/localimage.png") no-repeat center;border:1px solid #ddd; "alt=" Spacer.gif "/> write the Python script with notepad++, drag the script directly into the shell in Windows, enter execution.

Linux:

definition interpreter: #! /usr/bin/env python

Python2 The ASCII code is used by default, Chinese is not supported, and if you want to display Chinese, you need to specify a character encoding set: -*-coding:utf-8-*-

650) this.width=650; "width=" 703 "height=" 108 "src="/e/u261/themes/default/images/spacer.gif "style=" Background:url ("/e/u261/lang/zh-cn/images/localimage.png") no-repeat center;border:1px solid #ddd; "alt=" Spacer.gif "/>

Python3 default use Utf-8, support Chinese

Print () string to use "", in addition to the defined variables or numbers

Print ("name") prints the name

Print (name) prints The variable value of name,

Print (*) Print the number 360

Print ("name", name) prints string and the Variable Value

Pycharm Use

Create Project ( project )---Direct ( catalog )----python file ( script files )

CTRL +? Bulk Comment or bulk cancel comment

If:

Elif:

Else

Must have a colon.

While:

else:

For I in:

Python First day script:

#后面得变量中需要用到前面变量值的时候, with the%s placeholder, three quotes are output in a newline format.
# name = "Zoudechao"
# age = 22
# job = "Linux"
# info = ""
#-----------Info of%s--------
# Name%s
# Age%s
# Job%s
#-----------End-------------"% (name,name,age,job)
# Print (info)

#用户输入并定义变量
# NAME = input ("Your Name:")
# age = Input ("Your Age:")
# job = input ("Your job:")
# info = ""
#-----------Info of%s--------
# Name%s
# Age%s
# Job%s
#-----------End-------------"% (name,name,age,job)
# Print (info)


# name = "Zoudechao"
# print ("Youy name:", name)


#输入4次数字, judging the score
# count = 0
# While Count <= 3:
# num = Int (input ("Your num:"))
# count + = 1
# if Num >= 90:
# Print ("Best")
# elif num >= 80:
# print ("good")
# elif Num >= 70:
# print ("OK")
# Else:
# print ("Gun")



#验证用户名和密码, exit correctly, try 3 times
# count = 1
# While Count <= 3:
# count + = 1
# NAME = input ("Your Name:")
# password = input ("Your password:")
# if Name = = "Zoudechao" and Password = = "zou12345":
# Print ("Welcome")
# Break
# elif Count = = 4:
# print ("error")
# Break
# Else:
# print ("Try")


#用FOR循环实现上题目标
# for I in range (3):
# NAME = input ("Your Name:")
# password = input ("Your password:")
# if Name = = "Zoudechao" and Password = = "zou12345":
# Print ("Welcome")
# Break
# elif i = = 2:
# Print ("Your error")
# Break
# Else:
# print ("error")

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The path to learning Python