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translating---geekpi
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Python Hello World and String Manipulation
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======
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Before starting, I should mention that the [code][1] used in this blog post and in the [video][2] below is available on my github.
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With that, let’s get started! If you get lost, I recommend opening the [video][3] below in a separate tab.
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[Hello World and String Manipulation Video using Python][2]
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#### ** Get Started (Prerequisites)
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Install Anaconda (Python) on your operating system. You can either download anaconda from the [official site][4] and install on your own or you can follow these anaconda installation tutorials below.
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Install Anaconda on Windows: [Link][5]
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Install Anaconda on Mac: [Link][6]
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Install Anaconda on Ubuntu (Linux): [Link][7]
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#### Open a Jupyter Notebook
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Open your terminal (Mac) or command line and type the following ([see 1:16 in the video to follow along][8]) to open a Jupyter Notebook:
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```
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jupyter notebook
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```
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#### Print Statements/Hello World
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Type the following into a cell in Jupyter and type **shift + enter** to execute code.
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```
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# This is a one line comment
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print('Hello World!')
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```
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![][9]
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Output of printing ‘Hello World!’
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#### Strings and String Manipulation
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Strings are a special type of a python class. As objects, in a class, you can call methods on string objects using the .methodName() notation. The string class is available by default in python, so you do not need an import statement to use the object interface to strings.
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```
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# Create a variable
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# Variables are used to store information to be referenced
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# and manipulated in a computer program.
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firstVariable = 'Hello World'
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print(firstVariable)
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```
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![][9]
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Output of printing the variable firstVariable
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```
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# Explore what various string methods
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print(firstVariable.lower())
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print(firstVariable.upper())
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print(firstVariable.title())
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```
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![][9]
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Output of using .lower(), .upper() , and title() methods
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```
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# Use the split method to convert your string into a list
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print(firstVariable.split(' '))
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```
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![][9]
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Output of using the split method (in this case, split on space)
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```
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# You can add strings together.
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a = "Fizz" + "Buzz"
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print(a)
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```
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![][9]
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string concatenation
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#### Look up what Methods Do
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For new programmers, they often ask how you know what each method does. Python provides two ways to do this.
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1. (works in and out of Jupyter Notebook) Use **help** to lookup what each method does.
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![][9]
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Look up what each method does
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2. (Jupyter Notebook exclusive) You can also look up what a method does by having a question mark after a method.
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```
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# To look up what each method does in jupyter (doesnt work outside of jupyter)
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firstVariable.lower?
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```
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![][9]
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Look up what each method does in Jupyter
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#### Closing Remarks
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Please let me know if you have any questions either here or in the comments section of the [youtube video][2]. The code in the post is also available on my [github][1]. Part 2 of the tutorial series is [Simple Math][10].
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--------------------------------------------------------------------------------
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via: https://www.codementor.io/mgalarny/python-hello-world-and-string-manipulation-gdgwd8ymp
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作者：[Michael][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://www.codementor.io/mgalarny
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[1]:https://github.com/mGalarnyk/Python_Tutorials/blob/master/Python_Basics/Intro/Python3Basics_Part1.ipynb
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[2]:https://www.youtube.com/watch?v=JqGjkNzzU4s
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[3]:https://www.youtube.com/watch?v=kApPBm1YsqU
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[4]:https://www.continuum.io/downloads
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[5]:https://medium.com/@GalarnykMichael/install-python-on-windows-anaconda-c63c7c3d1444
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[6]:https://medium.com/@GalarnykMichael/install-python-on-mac-anaconda-ccd9f2014072
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[7]:https://medium.com/@GalarnykMichael/install-python-on-ubuntu-anaconda-65623042cb5a
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[8]:https://youtu.be/JqGjkNzzU4s?t=1m16s
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[9]:data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
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[10]:https://medium.com/@GalarnykMichael/python-basics-2-simple-math-4ac7cc928738
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@ -0,0 +1,132 @@
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Python 中的 Hello World 和字符串操作
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======
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开始之前，说一下本文中的[代码][1]和[视频][2]可以在我的 github 上找到。
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那么，让我们开始吧！如果你糊涂了，我建议你在单独的选项卡中打开下面的[视频][3]。
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[Python 的 Hello World 和字符串操作视频][2]
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#### ** 开始 (先决条件)
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在你的操作系统上安装 Anaconda（Python）。你可以从[官方网站][4]下载 anaconda 并自行安装，或者你可以按照以下这些 anaconda 安装教程进行安装。
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在 Windows 上安装 Anaconda： [链接[5]
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在 Mac 上安装 Anaconda： [链接][6]
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在 Ubuntu (Linux) 上安装 Anaconda：[链接][7]
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#### 打开一个 Jupyter Notebook
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打开你的终端（Mac）或命令行，并输入以下内容（[请参考视频中的 1:16 处][8]）来打开 Jupyter Notebook：
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```
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jupyter notebook
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```
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#### 打印语句/Hello World
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在 Jupyter 的单元格中输入以下内容并按下 **shift + 回车**来执行代码。
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```
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# This is a one line comment
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print('Hello World!')
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```
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打印输出 “Hello World!”
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#### 字符串和字符串操作
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字符串是 python 类的一种特殊类型。作为对象，在类中，你可以使用 .methodName() 来调用字符串对象的方法。字符串类在 python 中默认是可用的，所以你不需要 import 语句来使用字符串对象接口。
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```
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# Create a variable
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# Variables are used to store information to be referenced
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# and manipulated in a computer program.
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firstVariable = 'Hello World'
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print(firstVariable)
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```
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![][9]
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输出打印变量 firstVariable
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```
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# Explore what various string methods
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print(firstVariable.lower())
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print(firstVariable.upper())
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print(firstVariable.title())
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```
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![][9]
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使用 .lower()、.upper() 和 title() 方法输出
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```
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# Use the split method to convert your string into a list
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print(firstVariable.split(' '))
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```
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![][9]
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使用 split 方法输出（此例中以空格分隔）
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```
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# You can add strings together.
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a = "Fizz" + "Buzz"
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print(a)
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```
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![][9]
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字符串连接
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#### 查询方法的功能
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对于新程序员，他们经常问你如何知道每种方法的功能。Python 提供了两种方法来实现。
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1.（在不在 Jupyter Notebook 中都可用）使用 **help** 查询每个方法的功能。
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![][9]
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查询每个方法的功能
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2. (Jupyter Notebook exclusive) You can also look up what a method does by having a question mark after a method.
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2.（Jupyter Notebook 专用）你也可以通过在方法之后添加问号来查找方法的功能。
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```
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# To look up what each method does in jupyter (doesnt work outside of jupyter)
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firstVariable.lower?
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```
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![][9]
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在 Jupyter 中查找每个方法的功能
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#### 结束语
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如果你对本文或在[ YouTube 视频][2]的评论部分有任何疑问，请告诉我们。文章中的代码也可以在我的 [github][1] 上找到。本系列教程的第 2 部分是[简单的数学操作][10]。
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--------------------------------------------------------------------------------
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via: https://www.codementor.io/mgalarny/python-hello-world-and-string-manipulation-gdgwd8ymp
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作者：[Michael][a]
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译者：[geekpi](https://github.com/geekpi)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://www.codementor.io/mgalarny
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[1]:https://github.com/mGalarnyk/Python_Tutorials/blob/master/Python_Basics/Intro/Python3Basics_Part1.ipynb
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[2]:https://www.youtube.com/watch?v=JqGjkNzzU4s
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[3]:https://www.youtube.com/watch?v=kApPBm1YsqU
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[4]:https://www.continuum.io/downloads
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[5]:https://medium.com/@GalarnykMichael/install-python-on-windows-anaconda-c63c7c3d1444
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[6]:https://medium.com/@GalarnykMichael/install-python-on-mac-anaconda-ccd9f2014072
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[7]:https://medium.com/@GalarnykMichael/install-python-on-ubuntu-anaconda-65623042cb5a
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[8]:https://youtu.be/JqGjkNzzU4s?t=1m16s
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[9]:data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
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[10]:https://medium.com/@GalarnykMichael/python-basics-2-simple-math-4ac7cc928738
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