blocks|key|681273|text|安装以下模块，直接将2to3命令添加到entry_points中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|681274|pip+install+2to3|code-block|syntax|javascript|681275|在2至3名医生上编写时，要将整个项目从一个目录树转换为另一个目录树，请使用：|offset|length|681276|2to3+--output-dir=python3-version/mycode+-W+-n+python2-version/mycode|681277|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.python.org/2/library/2to3.html^0|0|0|1|6|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]]|A|$]]|$1|K|3|L|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Install the following module which adds the 2to3 command directly to entry_points.
<pre><code>pip install 2to3
</code></pre>
As it is written on <a href="http://docs.python.org/2/library/2to3.html" rel="noreferrer">2to3 docs</a>, to translate an entire project from one directory tree to another, use:
<pre><code>2to3 --output-dir=python3-version/mycode -W -n python2-version/mycode
</code></pre>

blocks|key|2204881|text|如果路径上没有2to3，则可以直接调用lib2to3|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2204882|python+-m+lib2to3+directory\file.py|code-block|syntax|javascript|2204883|正如医生们+(和其他答案)所提到的，您可以使用一些标志来进行更多的定制：|2204884|启用写回的-w标志，它将更改应用于文件|unordered-list-item|2204885|禁用备份的-n|2204886|(还有几个标志；有关更多信息，请参见文档。)|2204887|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.python.org/3/library/2to3.html^0|7|4|J|7|0|0|2|3|0|0|5|2|0|5|2|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|17|8|@]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|M|3|N|5|O|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|P|3|Q|5|O|7|1E|8|@$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|R|3|S|5|6|7|1H|8|@]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]]|U|$V|$5|W|X|Y|E|$Z|10]]]]

If you don't have <code>2to3</code> on your path, you can directly invoke <code>lib2to3</code>:

<pre><code>python -m lib2to3 directory\file.py
</code></pre>

And as <a href="https://docs.python.org/3/library/2to3.html" rel="noreferrer">the docs</a> (and other answers) mention, you can use some flags for more customization:

<ul>
<li>the <code>-w</code> flag to enable writeback, which applies the changes to the file</li>
<li>the <code>-n</code> to disable backups</li>
</ul>

(there are a few more flags; see the docs for more information.)

blocks|key|2204921|text|在运行2to3之前有一个备份是很重要的。|type|blockquote|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2204922|如果你使用的是git，就做出承诺。|ordered-list-item|2204923|否则，备份您的文件。|2204924|首先，以“软模式”运行2到3以查看它实际会做什么：|unstyled|2204925|$+2to3+/path/to/your/project|code-block|syntax|javascript|2204926|如果您对它所做的事情感到满意，那么您就可以“真正地”运行2到3：|2204927|$+2to3+--write+--nobackups+/path/to/your/project|2204928|现在您已经正确地运行了2to3+:)|2204929|entityMap^0|3|4|0|0|0|0|0|0|0|B|4|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|13|8|@]|D|@]|E|$]]|$1|I|3|J|5|H|7|14|8|@]|D|@]|E|$]]|$1|K|3|L|5|M|7|15|8|@]|D|@]|E|$]]|$1|N|3|O|5|P|7|16|8|@]|D|@]|E|$Q|R]]|$1|S|3|T|5|M|7|17|8|@]|D|@]|E|$]]|$1|U|3|V|5|P|7|18|8|@]|D|@]|E|$Q|R]]|$1|W|3|X|5|M|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|Y|3|-4|5|M|7|1C|8|@]|D|@]|E|$]]]|Z|$]]

<blockquote>
It's important to have a backup before running <code>2to3</code>.
<ol>
<li>If you're using git, make a commit.</li>
<li>Otherwise, make a backup copy of your files.</li>
</ol>
</blockquote>
First, run 2to3 in &quot;soft mode&quot; to see what it would actually do:
<pre><code>$ 2to3 /path/to/your/project
</code></pre>
If you're happy with what it would do, you can then run 2to3 &quot;for real&quot;:
<pre><code>$ 2to3 --write --nobackups /path/to/your/project
</code></pre>
And now you have properly run <code>2to3</code> :)

blocks|key|681332|text|在Windows上：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|681333|python+{path_to_python}\tools\scripts\2to3.py+--output-dir={output_dir}+-W+-n+{input_dir}|code-block|syntax|javascript|681334|path_to_python+=安装Python的目录|offset|length|style|CODE|681335|output_dir+=输出Python3脚本的目录|681336|input_dir+=从何处读取Python2脚本的目录|681337|entityMap^0|0|0|0|E|0|0|A|0|0|9|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@$I|Y|J|Z|K|L]]|9|@]|A|$]]|$1|O|3|P|5|6|7|10|8|@$I|11|J|12|K|L]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|R|$]]

On Windows:

<pre><code>python {path_to_python}\tools\scripts\2to3.py --output-dir={output_dir} -W -n {input_dir}
</code></pre>

<code>path_to_python</code> = directory where Python is installed

<code>output_dir</code> = directory where to output the Python3 scripts

<code>input_dir</code> = directory from where to read the Python2 scripts

blocks|key|2204808|text|要将目录中的所有python+2文件转换为3，只需在要翻译的目录中运行$+C:\Program+Files\Python\Tools\Scripts\2to3.py+-w+-n.。无论如何，它将跳过所有非.py文件，并转换其余的文件。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2204809|注意：如果您也想要备份文件，请移除-n标志。|BOLD|2204810|entityMap^0|Z|1I|2U|3|0|0|2|0^^$0|@$1|2|3|4|5|6|7|K|8|@$9|L|A|M|B|C]|$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|P|8|@$9|Q|A|R|B|H]]|D|@]|E|$]]|$1|I|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|J|$]]

To convert all python 2 files in a directory to 3, you simply could run <code>$ C:\Program Files\Python\Tools\Scripts\2to3.py -w -n.</code> inside the directory that you want to translate. It would skip all the non <code>.py</code> files anyway, and convert the rest. 
note: remove the -n flag, if you want the backup file too.

blocks|key|32851|text|运行起来非常简单！我将考虑您已经安装了它，并解释如何一步一步地进行之后：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|32852|在包含要转换的文件的主文件夹中打开终端(或win用户的cmd+)|ordered-list-item|32853|例如C:\Users\{your_username}\Desktop\python2folder|offset|length|style|CODE|32854|类型|32855|python+{your_2to3.py_install_directory}+-w+.\|32856|例如，在我的例子(win10)中，应该是：|32857|python+C:"\Program+Files"\Python39\Tools\scripts\2to3.py+-w+.\|32858|这将使程序扫描整个目录(以及子目录)，并自动将用Python2编写的所有内容转换为Python3。|32859|-w标志使脚本应用更改，创建新的转换文件。因此，删除它，您只想扫描和查看什么需要转换(但实际上没有做任何事情)|32860|如果您只想转换一个文件而不是整个文件夹，只需将.\替换为python2_file_name.py|32861|例如python+{your_2to3.py+directory}+-w+python2_file_name.py|32862|此外，默认情况下，它为其转换的所有内容创建一个.bak文件。建议保持这种方式，因为任何转换都很容易出错，但是如果您想禁用自动备份，也可以添加-n标志。|32863|例如python+C:"\Program+Files"\Python39\Tools\scripts\2to3.py+-w+-n+python2_file_name.py|32864|3.完成！|32865|entityMap^0|0|0|2|1A|0|0|0|19|0|0|0|1Q|0|0|0|2|0|N|2|S|K|0|2|1J|0|1Y|2|0|2|2B|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|19|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|1A|8|@$G|1B|H|1C|I|J]]|9|@]|A|$]]|$1|K|3|L|5|D|7|1D|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1E|8|@$G|1F|H|1G|I|J]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1H|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1I|8|@$G|1J|H|1K|I|J]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1L|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1M|8|@$G|1N|H|1O|I|J]]|9|@]|A|$]]|$1|W|3|X|5|6|7|1P|8|@$G|1Q|H|1R|I|J]|$G|1S|H|1T|I|J]]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1U|8|@$G|1V|H|1W|I|J]]|9|@]|A|$]]|$1|10|3|11|5|6|7|1X|8|@$G|1Y|H|1Z|I|J]]|9|@]|A|$]]|$1|12|3|13|5|6|7|20|8|@$G|21|H|22|I|J]]|9|@]|A|$]]|$1|14|3|15|5|6|7|23|8|@]|9|@]|A|$]]|$1|16|3|-4|5|6|7|24|8|@]|9|@]|A|$]]]|17|$]]

Running it is very simple! I am going to consider you already have it installed and explain step-by-step how to proceed after that:
<ol>
<li>Open terminal (or cmd for win users) inside the main folder containing the files you want to convert</li>
</ol>
e.g.
<code>C:\Users\{your_username}\Desktop\python2folder</code>
<ol start="2">
<li>Type</li>
</ol>
<code>python {your_2to3.py_install_directory} -w .\</code>
e.g. in my case (win10) it would be:
<code>python C:&quot;\Program Files&quot;\Python39\Tools\scripts\2to3.py -w .\</code>
This is going to make the program scan the entire directory (and sub directories as well) and automatically convert everything that is written in Python2 to Python3.
<code>-w</code> flag makes the script apply the changes creating new converted files. So remove this you'd like to just scan and see what needs conversion (but without actually doing anything)
If you'd like to convert just one file instead of entire folders simply substitute <code>.\</code> for <code>python2_file_name.py</code>:
e.g. <code>python {your_2to3.py directory} -w python2_file_name.py</code>
Also, by default it creates a .bak file for everything it converts. It is highly advised to keep it this way since any conversion is prone to errors but if you'd like to disable the automatic backup you could also add the <code>-n</code> flag.
e.g. <code>python C:&quot;\Program Files&quot;\Python39\Tools\scripts\2to3.py -w -n python2_file_name.py</code>
3.Done!

blocks|key|682351|text|若要将代码从python2转换为python3，请首先使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|682352|pip+install+2to3|code-block|syntax|javascript|682353|然后在您的python代码所在的目录中运行以下命令|682354|2to3+-w+-n+.|682355|-w标志以启用写回，它将更改应用于文件|unordered-list-item|682356|-n禁用备份|682357|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|T|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|M|7|V|8|@]|9|@]|A|$]]|$1|N|3|O|5|M|7|W|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|Q|$]]

To convert the code from python2 to python3 first install the 2to3 package by using
<pre><code>pip install 2to3
</code></pre>
Then run this command in directory where is your python code
<pre><code>2to3 -w -n .
</code></pre>
<ul>
<li>-w flag to enable writeback, which applies the changes to the file</li>
<li>-n to disable backups</li>
</ul>

blocks|key|32802|text|首先安装python+2to3包：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|32803|C:\Default>+pip+install+2to3|code-block|syntax|javascript|32804|而不是将python2文件转换为新文件夹中的python3，即python3-version/mycode|32805|C:\Default>+2to3+your_file_name.py+--output-dir=python3-version/mycode+-w+-n|32806|新的python3文件可以在新文件夹(即python3-version/mycode+)中看到|32807|entityMap^0|B|4|0|0|4|7|M|7|V|M|0|0|2|7|K|M|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|R|$]]

First install python <code>2to3</code> package : 

<pre><code>C:\Default&gt; pip install 2to3
</code></pre>

Than convert your <code>python2</code> file into <code>python3</code> in your new folder i.e. <code>python3-version/mycode</code>

<pre><code>C:\Default&gt; 2to3 your_file_name.py --output-dir=python3-version/mycode -w -n
</code></pre>

Your new <code>python3</code> file can be seen in new folder i.e. <code>python3-version/mycode</code>

blocks|key|2204853|text|如果您已经安装了python，那么python+2to3.py文件主要位于目录C:/Program+/python/Tools/script中。我有python3.6和2to3目录C:/Program+/+python+36/Tools/script。要将某个python+2代码转换为python+3，转到命令promt，将目录更改为C:/Program+/python+36/Tools/脚本，其中可以找到2to3文件。然后添加以下命令:Python2to3.py+-w+(目录到脚本)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2204854|例如：C：\Files\Python36\Tools\scripts>python2to3.py+-w+C:Users\Iykes\desktop\test.py程序。|2204855|这里的'-w‘确保为您的文件创建一个备份文件。|2204856|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

The python 2to3.py file is mostly found in the directory C:/Program Files/Python/Tools/scripts if you already have python installed. I have python 3.6 and 2to3 is in the directory C:/Program Files/Python36/Tools/scripts.
To convert a certain python 2 code to python 3, go to your command promt, change the directory to C:/Program Files/Python36/Tools/scripts where the 2to3 file is found. Then add the following command:
python 2to3.py -w (directory to your script).

eg. C:\Program Files\Python36\Tools\scripts＞ python 2to3.py -w C:Users\Iykes\desktop\test.py. 

the '-w' here ensures a backup file for your file is created.

I have some code in python 2.7 and I want to convert it all into python 3.3 code. I know 2to3 can be used but I am not sure exactly how to use it.

How to use 2to3 properly for python?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我在python2.7中有一些代码，我想将其全部转换为python3.3代码。我知道2到3可以使用，但我不知道具体如何使用它。

问如何在python中正确地使用2-3？
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问如何在python中正确地使用2-3？
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