Python 导入错误：未找到 paho.mqtt.client
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Import Error: paho.mqtt.client not found
提问by Sid411
I am creating a docker containing python and php. I am writing a python script to connect to a MQTT broker residing in another docker.
我正在创建一个包含 python 和 php 的 docker。我正在编写一个 python 脚本来连接到驻留在另一个 docker 中的 MQTT 代理。
In my dockerfile I ensure that I install the paho client by using the following commands:
在我的 dockerfile 中，我确保使用以下命令安装了 paho 客户端：
RUN apt-get install -y python3-dev
RUN apt-get install -y libffi-dev
RUN apt-get install -y libssl-dev
ADD https://bootstrap.pypa.io/get-pip.py /tmp/get-pip.py
RUN cat /tmp/get-pip.py | python3
RUN pip install paho-mqtt
RUN pip install python-etcd
However when I run the python script I get the following error:
但是，当我运行 python 脚本时，出现以下错误：
ImportError: No module named paho.mqtt.client
The docker installation does not show any error with regards to paho-mqtt installation. It will be great if someone can guide on this.
docker 安装未显示有关 paho-mqtt 安装的任何错误。如果有人可以对此进行指导，那就太好了。
回答by Eddie
I think I have found the problem,
我想我已经找到了问题，
You have installed Python3but for some reason the interpreter defaults to version 2.7 in Linux.
您已经安装，Python3但由于某种原因，解释器在 Linux 中默认为 2.7 版。
Try using pip3 install paho-mqtt python-etcdinstead.
尝试使用pip3 install paho-mqtt python-etcd。
Or if it does not work, you can literally copy and paste the pahofolder from your Python2.7site-packagesfolder to your Python3site-packagesfolder. I have just verified paho-mqtt 1.2for Python2is exactly the same as paho-mqtt 1.2for Python3using a Melddiff tool. Please note, when you directly copy and paste pip listwill not display the package you copied.
或者，如果它不起作用，您可以直接将paho文件夹从您的Python2.7site-packages文件夹复制并粘贴到您的Python3site-packages文件夹中。我刚才已经证实paho-mqtt 1.2为Python2是完全一样paho-mqtt 1.2的Python3使用Meld比较工具。请注意，当您直接复制和粘贴pip list时，不会显示您复制的包。
site-packagesare usually inside your system libfolder. It depends upon how Pythonis installed. In my case everything is inside $HOME/.pyenvfolder.
site-packages通常在您的系统lib文件夹中。这取决于如何Python安装。在我的情况下，一切都在$HOME/.pyenv文件夹内。
Remember Python2has it's own site-packagesfolder and Python3has it's own site-packagesfolder where Pythonsearches for the packages. Sometimes if you are using a Debianbased Linux distro please make sure to check inside the dist-packagesfolder as well to see if you can find the package you are looking for.
请记住Python2，它有自己的site-packages文件夹，并Python3有自己的site-packages文件夹用于Python搜索包。有时，如果您使用的是Debian基于 Linux 的发行版，请务必检查dist-packages文件夹内部，看看是否可以找到您正在寻找的软件包。
回答by Fernando Simplicio
You can try install Paho lib:
您可以尝试安装 Paho lib：
git clone https://github.com/eclipse/paho.mqtt.python
Once you have the code, it can be installed from your repository as well:
一旦你有了代码，它也可以从你的存储库中安装：
cd paho.mqtt.python
python setup.py install
