Python 3入门教程：简单易学的编程语言

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《A Byte of Python》是一本面向初学者的Python 3编程教程，作者Swaroop C.H.编写，旨在提供一个简洁易懂的入门指南。该书以英文呈现，但语言通俗，即使非英语母语者也能逐步理解。书中主要特点包括： 1. **简单明了**（Simple）：Python设计目标之一是简洁性，让代码易于阅读和维护。 2. **易学**（Easy to Learn）：强调对新手友好，通过清晰的解释和实例，帮助读者快速上手。 3. **开源免费**（Free and Open Source）：作为一门自由软件，用户可以免费获取并参与到社区开发中。 4. **高级语言特性**： - **模块化**（Portable）：Python可以在多种操作系统上运行。 - **解释型**（Interpreted）：无需编译，可以直接执行代码。 - **面向对象**（Object-Oriented）：支持面向对象编程，促进代码复用和模块化。 - **可扩展性**（Extensible）：允许用户扩展功能，增加新模块或库。 5. **Python 2与3的区别**（Python 2 versus 3）：书中会介绍两个版本的不同之处，以便读者了解当前最新趋势。 6. **程序员评价**（What Programmers Say）：引用实际程序员的反馈，展示Python在业界的应用和认可度。 7. **安装指导**（Installation）： - **Windows**：详细介绍了通过命令提示符进行安装和启动Python环境的方法。 - **MacOS X**：针对苹果系统提供了安装步骤。 - **Linux**：同样提供适用于不同Linux发行版的安装说明。 - **总结**：这部分概述了安装过程中的关键点。 8. **入门实践**（First Steps）： - **使用交互式解释器**（Using The Interpreter Prompt）：引导读者通过命令行交互学习。 - **选择编辑器**（Choosing An Editor）：推荐适合初学者使用的文本编辑器。 - **源文件操作**（Using A Source File）：讲解如何编写和运行Python代码文件。《A Byte of Python》是一本非常适合初学者的Python教程，注重实用性，结合实例让读者在轻松愉快的氛围中掌握这门强大而流行的编程语言。无论是为了学术学习还是职业发展，本书都是踏上Python编程之旅的良好起点。

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3.1.4 High-level Language

When you write programs in Python, you never need to bother about the

low-level details such as managing the memory used by your program, etc.

3.1.5 Portable

Due to its open-source nature, Python has been ported to (i.e. changed to make

it work on) many platforms. All your Python programs can work on any of these

platforms without requiring any changes at all if you are careful enough to avoid

any system-dependent features.

You can use Python on Linux, Windows, FreeBSD, Macintosh, Solaris, OS/2,

Amiga, AROS, AS/400, BeOS, OS/390, z/OS, Palm OS, QNX, VMS, Psion,

Acorn RISC OS, VxWorks, PlayStation, Sharp Zaurus, Windows CE and even

PocketPC!

You can even use a platform like Kivy to create games for iOS (iPhone, iPad)

and Android.

3.1.6 Interpreted

This requires a bit of explanation.

A program written in a compiled language like C or C++ is converted from the

source language i.e. C or C++ into a language that is spoken by your computer

(binary code i.e. 0s and 1s) using a compiler with various ﬂags and options.

When you run the program, the linker/loader software copies the program from

hard disk to memory and starts running it.

Python, on the other hand, does not need compilation to binary. You just run

the program directly from the source code. Internally, Python converts the

source code into an intermediate form called bytecodes and then translates this

into the native language of your computer and then runs it. All this, actually,

makes using Python much easier since you don’t have to worry about compiling

the program, making sure that the proper libraries are linked and loaded, etc.

This also makes your Python programs much more portable, since you can just

copy your Python program onto another computer and it just works!

3.1.7 Object Oriented

Python supports procedure-oriented programming as well as object-oriented

programming. In procedure-oriented languages, the program is built around

procedures or functions which are nothing but reusable pieces of programs. In

object-oriented languages, the program is built around objects which combine

data and functionality. Python has a very powerful but simplistic way of doing

OOP, especially when compared to big languages like C++ or Java.

3.1.8 Extensible

If you need a critical piece of code to run very fast or want to have some piece

of algorithm not to be open, you can code that part of your program in C or

C++ and then use it from your Python program.

3.1.9 Embeddable

You can embed Python within your C/C++ programs to give ‘scripting’ capa-

bilities for your program’s users.

3.1.10 Extensive Libraries

The Python Standard Library is huge indeed. It can help you do various things

involving regular expressions,documentation generation, unit testing, threading,

databases, web browsers, CGI, FTP, email, XML, XML-RPC, HTML, WAV

ﬁles, cryptography, GUI (graphical user interfaces), and other system-dependent

stuﬀ. Remember, all this is always available wherever Python is installed. This

is called the Batteries Included philosophy of Python.

Besides the standard library, there are various other high-quality libraries which

you can ﬁnd at the Python Package Index.

Summary

Python is indeed an exciting and powerful language. It has the right

combination of performance and features that make writing programs in

Python both fun and easy.

3.2 Python 2 versus 3

You can ignore this section if you’re not interested in the diﬀerence between

Python 2 and Python 3. But please do be aware of which version you are using.

This book was rewritten in 2008 for Python 3. It was one of the ﬁrst books to

use Python 3. This, unfortunately, resulted in confusion for readers who would

try to use Python 2 with the Python 3 version of the book and vice-versa. But

slowly, the world is still migrating to Python 3.

So, yes, you will be learning to use Python 3 in this book, even if you want

to ultimately use Python 2. Remember that once you have properly understood

and learn to use either of them, you can easily learn the changes between the

two versions and adapt easily. The hard part is learning programming and

For Windows 2000, XP, 2003 , click on

Control Panel

—

System

—

Advanced

—

Environment Variables

. Click on the variable named

PATH

in the ‘System

Variables’ section, then select

Edit

and add

;C:\Python33

(please verify that

this folder exists, it will be diﬀerent for newer versions of Python) to the end of

what is already there. Of course, use the appropriate directory name.

For older versions of Windows, open the ﬁle

C:\AUTOEXEC.BAT

and add the line

‘

PATH=%PATH%;C:\Python33

’ (without the quotes) and restart the system. For

Windows NT, use the AUTOEXEC.NT ﬁle.

For Windows Vista:

1. Click Start and choose Control Panel

Click System, on the right you’ll see “View basic information about your

computer”

On the left is a list of tasks, the last of which is “Advanced system settings.”

Click that.

The Advanced tab of the System Properties dialog box is shown. Click the

Environment Variables button on the bottom right.

In the lower box titled “System Variables” scroll down to Path and click

the Edit button.

6. Change your path as need be.

Restart your system. Vista didn’t pick up the system path environment

variable change until I restarted.

For Windows 7:

Right click on Computer from your desktop and select properties or Click

Start and choose Control Panel — System and Security — System. Click

on Advanced system settings on the left and then click on the Advanced

tab. At the bottom click on Environment Variables and under System

variables, look for the PATH variable, select and then press Edit.

Go to the end of the line under Variable value and append

;C:\Python33

If the value was

%SystemRoot%\system32;

It will now become

%SystemRoot%\system32;C:\Python33

4. Click ok and you are done. No restart is required.

4.1.2 Running Python prompt on Windows

For Windows users, you can run the interpreter in the command line if you have

set the PATH variable appropriately.

To open the terminal in Windows, click the start button and click ‘Run’. In the

dialog box, type cmd and press enter key.

Then, type python3 -V and ensure there are no errors.

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Python 3入门教程：简单易学的编程语言

A_Byte_of_Python_v1.92_(for_Python_3.0)_(2009).ra_A Byte of Pyth

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用python编写一个CNN，内容是：文件检测，输出的参数有：参数1：文件名；参数2：类别（A、B、C）；参数3(恶意代码的一个字符)：Byte_0； 参数4：Byte_1;参数5：Byte_2;

用python编写一个CNN，内容是：上传文件检测，参数1：文件名；参数2：类别（A、B、C）；参数3(恶意代码的一个字符)：Byte_0； 参数4：Byte_1;参数5：Byte_2;

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用python编写一个CNN，内容是：文件检测，输出的参数有：参数1：文件名；参数2：类别（A、B、C）；参数3(恶意代码的一个字符)：Byte_0；参数4：Byte_1;参数5：Byte_2;

用python编写一个CNN，内容是：上传文件检测，参数1：文件名；参数2：类别（A、B、C）；参数3(恶意代码的一个字符)：Byte_0；参数4：Byte_1;参数5：Byte_2;