Python编程教程：开源授权与资源链接

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Creating Python programs

4.1.1 Windows

•

Create a folder on your computer to use for your Python programs, such as

C:\pythonpractice, and save your hello.py program in that folder.

•

In the Start menu, select "Run...", and type in

cmd

. This will cause the Windows terminal to open.

•

Type

cd \pythonpractice

hange

irectory to your

pythonpractice

folder, and hit

Enter.

• Type python hello.py to run your program!

If it didn't work, make sure your PATH contains the python directory. See Getting Python

4.1.2 Mac

•

Create a folder on your computer to use for your Python programs. A good suggestion would be to

name it

pythonpractice

and place it in your Home folder (the one that contains folders for

Documents, Movies, Music, Pictures, etc). Save your hello.py program into this folder.

• Open the Applications folder, go into the Utilities folder, and open the Terminal program.

•

Type

cd pythonpractice

hange

irectory to your

pythonpractice

folder, and hit

Enter.

• Type python hello.py to run your program!

4.1.3 Linux

•

Create a folder on your computer to use for your Python programs, such as

˜/pythonpractice

and save your hello.py program in that folder.

•

Open up the terminal program. In KDE, open the main menu and select "Run Command..." to open

Konsole. In GNOME, open the main menu, open the Applications folder, open the Accessories

folder, and select Terminal.

•

Type

cd ˜/pythonpractice

hange

irectory to your

pythonpractice

folder, and

hit Enter.

• Type python hello.py to run your program!

Note:

If you have both python version 2.6.1 and version 3.0 installed (Very possible if you are using

Ubuntu, and ran

sudo apt-get python3

to have python3 installed), you should run

python3

hello.py

An Alternative

There is a ﬁle called

idle.py

in your Python ﬁle. It is in the idlelib folder, located in the Lib folder.

This is a Python programmer written in Python. You might ﬁnd it a bit easier to use than cmd.

4 Chapter 2 on page 5

Basic syntax

An example is the

upper

attribute of strings, which refers to the code that returns a copy of the string

in which all the letters are uppercase. To get to this, it is necessary to have a way to refer to the object

(in the following example, the way is the literal string that constructs the object).

'bob'.upper

Code attributes are called "methods". So in this example, upper is a method of

bob

(as it is of all

strings). To execute the code in a method, use a matched pair of parentheses surrounding a comma

separated list of whatever arguments the method accepts (upper doesn

t accept any arguments). So to

ﬁnd an uppercase version of the string 'bob', one could use the following:

'bob'.upper()

5.0.4 Scope

In a large system, it is important that one piece of code does not affect another in difﬁcult to predict

ways. One of the simplest ways to further this goal is to prevent one programmer

s choice of names

from preventing another from choosing that name. Because of this, the concept of scope was invented.

A scope is a "region" of code in which a name can be used and outside of which the name cannot be

easily accessed. There are two ways of delimiting regions in Python: with functions or with modules.

They each have different ways of accessing the useful data that was produced within the scope from

outside the scope. With functions, that way is to return the data. The way to access names from other

modules lead us to another concept.

5.0.5 Namespaces

It would be possible to teach Python without the concept of namespaces because they are so similar

to attributes, which we have already mentioned, but the concept of namespaces is one that transcends

any particular programming language, and so it is important to teach. To begin with, there is a

built-in function

dir()

that can be used to help one understand the concept of namespaces. When

you ﬁrst start the Python interpreter (i.e., in interactive mode), you can list the objects in the current

(or default) namespace using this function.

Python 2.3.4 (#53, Oct 18 2004, 20:35:07) [MSC v.1200 32 bit (Intel)] on win32

Type "help", "copyright", "credits" or "license" for more information.

>>> dir()

['__builtins__', '__doc__', '__name__']

This function can also be used to show the names available within a module namespace. To

demonstrate this, ﬁrst we can use the type() function to show what __builtins__is:

>>> type(__builtins__)

Since it is a module, we can list the names within the __builtins__namespace, again using the

dir()

function (note the complete list of names has been abbreviated):

>>> dir(__builtins__)

['ArithmeticError', ... 'copyright', 'credits', ... 'help', ... 'license', ...

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Python编程教程：开源授权与资源链接

wiki_word2vec_50.bin.zip

[Wiki Books]Python_Programming.rar_Be More

wget-1.14-18.el7_6.1.x86_64.rpm 那儿有下载

word2ver_wiki_cn.model 下载

文件夹中创建一个名为mbot_base.urdf的文件

from geometry_msgs.msg import Twist,python中需要下载司马

..\HARDWARE\W5500\w5500_conf.c(112): error: #65: expected a ";"

推荐一些python的教程给我

mbot文件夹下创建文件mbot_base.urdf

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第二步软件包python-rpi.gpio

使用C语言完成：读取一幅24位真彩的bmp图像，给图像四周加 一个宽度大于 1 像素的任意颜色的边框，另存为图像文件 IMG3_24.bmp。

python免费学习网站

请给我一个 可查看制作NES常用的R650X CPU的手册的网址

wiki api python

最新资源

使用C语言完成：读取一幅24位真彩的bmp图像，给图像四周加一个宽度大于 1 像素的任意颜色的边框，另存为图像文件 IMG3_24.bmp。

请给我一个可查看制作NES常用的R650X CPU的手册的网址