如何使用/安装 python 2to3？
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How to use/install python 2to3?
提问by Kirbies
From this https://docs.python.org/3.4/library/2to3.htmlit says that 2to3 should be installed as a script alongside the python interpreter. However, in my /usr/bin/ folder there are no 2to3 executable, and running findfrom / finds no 2to3 executable either. I do however have a folder called lib2to3 at /usr/lib64/python{3.4/2.7}/lib2to3 but containing nothing I found relevant. In python/site-packages/setuptools/ there is a lib2to3_ex.py script, but nothing happens if I run it. How do I get to the point where I can simply type 2to3 upgradethisscripttopython3.py?
从这个https://docs.python.org/3.4/library/2to3.html它说 2to3 应该作为脚本安装在 python 解释器旁边。但是，在我的 /usr/bin/ 文件夹中没有 2to3 可执行文件，并且find从 /运行也找不到 2to3 可执行文件。然而，我在 /usr/lib64/python{3.4/2.7}/lib2to3 有一个名为 lib2to3 的文件夹，但不包含我认为相关的任何内容。在 python/site-packages/setuptools/ 中有一个 lib2to3_ex.py 脚本，但如果我运行它，则没有任何反应。我如何达到可以简单输入的程度2to3 upgradethisscripttopython3.py？
回答by Kirbies
So the solution is that at least not for me, the Tools/scripts files were not automatically installed. On ubuntu this would be solved by installing python-exampleswhich on opensuse is called python-demo
所以解决方案是至少对我来说不是，工具/脚本文件没有自动安装。在 ubuntu 上，这将通过安装python-examples在 opensuse 上被调用来解决python-demo
回答by Chris W.
On CentOS (and other RHEL-like distros) you will need to run yum install python-tools, which installs 2to3to /usr/bin/2to3
在 CentOS（和其他类似 RHEL 的发行版）上，您需要运行yum install python-tools，它会安装2to3到/usr/bin/2to3
回答by Daniyal Naeem
You need to first install the following packages:
您需要先安装以下软件包：
apt install 2to3
apt install python3-lib2to3
apt install python3-toolz
Then, You can simply go to that directory your python file is in and type the following command:
然后，您可以简单地转到您的 python 文件所在的目录并键入以下命令：
2to3 ./filename.py
2to3 ./filename.py
OR
或者
2to3 . -w
2to3 . -w
This last will convert all the python files that are in the directory.
这最后将转换目录中的所有 python 文件。
回答by P. Le Sager
On Fedora 29, the python-toolsis not providing 2to3. I had to install the development package:
在 Fedora 29 上，python-tools不提供2to3. 我必须安装开发包：
dnf install python3-devel
I found this out by first calling:
我通过第一次调用发现了这一点：
dnf whatprovides /usr/bin/2to3
回答by Aqeeb Imtiaz Harun
So far I've been using pip install 2to3. Conversions worked like absolute charm!
(I'm on Ubuntu 18.04)
到目前为止，我一直在使用pip install 2to3. 转换工作就像绝对的魅力！（我在 Ubuntu 18.04 上）
