### 统计代写|python代考|Understanding Different Quotes

Python是一种高级的、解释性的、通用的编程语言。它的设计理念强调代码的可读性，使用大量的缩进。

Python是动态类型的，并且是垃圾收集的。它支持多种编程范式，包括结构化（特别是程序化）、面向对象和函数式编程。由于其全面的标准库，它经常被描述为一种 “包含电池 “的语言。

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## 统计代写|python代考|Understanding Different Quotes

Three different types of quotes are used in Python. First, there are the single and double quotes, which you can look at in two ways. In one way, they are identical. They work the same way and they do the same things. Why have both? Well, there are a couple of reasons. First, strings play a huge part in almost any program that you’re going to write, and quotes define strings. One challenge when you first use them is that quotes aren’t special characters that appear only in computer programs. They are a part of any normal English text to indicate that someone has spoken. In addition, they are used for emphasis or to indicate that something is literally what was seen or experienced.

The dilemma for a programming language is that when you’re programming, you can only use characters that are already on a keyboard. However, the keys on a keyboard can be entered by the average user, so obviously people normally use those keys for tasks other than programming! Therefore, how do you make it a special character? How do you indicate to the language that you, the programmer, mean something different when you type a set of quotes to pass a string to your program, versus when you, as the programmer, enter quotes to explain something to the person using your program?

One solution to this dilemma is a technique that’s called escaping. In most programming languages, at least one character, called an escape character, is designated; and it has the power to remove the special

significance from other special characters, such as quotes. This character in Python is the backslash ( $\backslash$ ). Therefore, if you have to quote some text within a string and it uses the same style of quote in which you enclosed the entire string, you need to escape the quote that encloses the string to prevent Python from thinking that it has prematurely reached the end of a string. If that sounds confusing, it looks like this:
$>>>$ ‘And he said /this string has escaped quotes $\backslash$ ‘
“And he said ‘this string has escaped quotes'”
Returning to those three examples, normally a running Python shell will show you a string that it has evaluated in single quotes. However, if you use a single quote within a string that begins and ends with double quotes, Python will display that string with double quotes around it to make it obvious to you where the string starts and where it ends:
$>>>$ ‘Ben said “How ‘re we supposed to know that?”
‘Ben said “How’re we supposed to know that?”‘
$>>>$
This shows you that there is no difference between single and double quoted strings. The only thing to be aware of is that when you start a string with a double quote, it can’t be ended by a single quote, and vice versa. Therefore, if you have a string that contains single quotes, you can make your life easier by enclosing the string in double quotes, and vice versa if you’ve got strings with quotes that have been enclosed in single quotes. $S Q L$, the language that is used to obtain data from databases, will often have single quoted strings inside of them that have nothing to do with Python. You can learn more about this when you reach Chapter 14. One more important rule to know is that by themselves, quotes will not let you create a newline in a string. The newline is the character that Python uses internally to mark the end of a line. It’s how computers know that it’s time to start a new line.

## 统计代写|python代考|Using a Format Specifier to Populate a String

That 호 is the format specifier for a string. Several other specifiers will be described as their respective types are introduced. Each specifier acts as a placeholder for that type in the string; and after the string, the : of sign outside of the string indicates that after it, all of the values to be inserted into the format specifier will be presented there to be used in the string.
You may be wondering why the parentheses are there. The parentheses indicate to the string that it should expect to see a sequence that contains the values to be used by the string to populate its format specifiers.

Sequences are a very important part of programming in Python, and they are covered in some detail later. For now, we are just going to use them. What is important to know at this point is that every format specification in a string has to have an element that matches it in the sequence that’s provided to it. The items we are putting in the sequence are strings that are separated by commas (if there is more than one). If there is only one, as in the preceding example, the sequence isn’t needed, but it can be used.
The reason why this special escape sequence is called a format specifier is because you can do some other special things with it – that is, rather than just insert values, you can provide some specifications about how the values will be presented, how they’ll look.

## 统计代写|python代考|Printing Text with Print

For displaying text, a special feature is built into useful languages, one that helps the programmer display information to users. The basic way to do this in Python is by using the print function:
John $Q$. Public
$>>>$
You’ll notice that there are no longer any quotes surrounding the first, middle, and last name. In this case, it’s significant – this is the first thing that you’ve done that would actually be seen by someone using a program that you’ve written!

print is a function – a special name that you can put in your programs that will perform one or more tasks behind the scenes. Normally, you don’t have to worry about how it happens. (When you start writing your own functions in Chapter 5 , you’ll naturally start to think more about how this works.)
In this case, the print function is an example of a built-in function, which is a function included as a part of Python, as opposed to a function that you or another programmer has written. The print function performs output – that is, it presents something to the user using a mechanism that they can see, such as a terminal, a window, a printer, or perhaps another device (such as a scrolling LED display). Related routines perform input, such as getting information from the user, from a file, from the network, and so on. Python considers these input/output (I/O) routines. I/O commonly refers to anything in a program that prints, saves, goes to or from a disk, or connects to a network. You will learn more about $\mathrm{I} / \mathrm{O}$ in Chapter $8 .$

## 统计代写|python代考|Understanding Different Quotes

Python 中使用了三种不同类型的引号。首先，有单引号和双引号，您可以通过两种方式查看。一方面，它们是相同的。他们以同样的方式工作，做同样的事情。为什么两者都有？嗯，有几个原因。首先，字符串在您要编写的几乎所有程序中都扮演着重要的角色，而引号定义了字符串。首次使用引号时的一个挑战是引号不是仅出现在计算机程序中的特殊字符。它们是任何正常英文文本的一部分，表示有人说过。此外，它们用于强调或表明某事实际上是所看到或经历的。

>>>’他说/这个字符串已经转义了引号∖’
“他说’这个字符串已经转义了引号’”

>>>’本说：“我们怎么知道呢？”
“本说‘我们怎么知道？’”
>>>

## 统计代写|python代考|Using a Format Specifier to Populate a String

호 是字符串的格式说明符。其他几个说明符将在介绍它们各自的类型时进行描述。每个说明符都充当字符串中该类型的占位符；在字符串之后，字符串外部的 : of 符号表示在它之后，所有要插入到格式说明符中的值都将出现在那里以在字符串中使用。

## 统计代写|python代考|Printing Text with Print

John问. 上市
>>>

print 是一个函数——一个特殊的名字，你可以把它放在你的程序中，它会在后台执行一个或多个任务。通常，您不必担心它是如何发生的。（当你在第 5 章开始编写自己的函数时，你自然会开始更多地思考它是如何工作的。）

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## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。