在安装mechanize后，我似乎无法导入它。
我已经尝试从pip、easy_install和通过python setup.py从这个repo安装:https://github.com/abielr/mechanize。所有这些都无济于事，因为每次我输入Python交互时，我得到:
Python 2.7.3 (default, Aug 1 2012, 05:14:39)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import mechanize
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named mechanize
>>>
我之前运行的安装报告已经成功完成，因此我希望导入能够正常工作。是什么导致了这个错误?
当前回答
我一直在用脑袋撞显示器，直到一个年轻的实习生告诉我，秘诀是在模块目录中“python setup.py install”。
出于某种原因，从那里运行设置可以让它正常工作。
需要明确的是，如果你的模块名是"foo":
[burnc7 (2016-06-21 15:28:49) git]# ls -l
total 1
drwxr-xr-x 7 root root 118 Jun 21 15:22 foo
[burnc7 (2016-06-21 15:28:51) git]# cd foo
[burnc7 (2016-06-21 15:28:53) foo]# ls -l
total 2
drwxr-xr-x 2 root root 93 Jun 21 15:23 foo
-rw-r--r-- 1 root root 416 May 31 12:26 setup.py
[burnc7 (2016-06-21 15:28:54) foo]# python setup.py install
<--snip-->
如果您试图从任何其他目录通过调用其路径来运行setup.py，那么您最终会得到一个borked安装。
不工作:
python /root/foo/setup.py install
做的工作:
cd /root/foo
python setup.py install
其他回答
当您通过easy_install或pip安装时，它是否成功完成?全输出是多少?您正在使用哪个python安装?如果您正在将模块安装到系统目录(如果您正在使用系统python安装)，则可能需要在使用安装命令之前使用sudo。你的问题中没有太多有用的信息，但是一些工具可能会有帮助，包括:
echo $PYTHONPATH and/or echo $PATH: when importing modules, Python searches one of these environment variables (lists of directories, : delimited) for the module you want. Importing problems are often due to the right directory being absent from these lists which python, which pip, or which easy_install: these will tell you the location of each executable. It may help to know. Use virtualenv, like @JesseBriggs suggests. It works very well with pip to help you isolate and manage the modules and environment for separate Python projects.
对我来说，它是确保模块的版本与我使用的Python版本一致。我在一个装有Python 3.6的盒子上构建了这个映像，然后注入到一个恰好安装了3.7的Docker映像中，然后当Python告诉我这个模块没有安装时，我撞了头……
Python 3.6的36m bsonnumpy.cpython-36m-x86_64-linux-gnu.so
bsonnumpy.cpython-37m-x86_64-linux-gnu.so
就我而言，这是许可问题。软件包以某种方式安装，只有根读写权限，其他用户不能读写它!
I know, that this is very old post but I didn't find any answer that was useful in my case (I am using arch linux). I had a similar problem installing "nest_asyncio" package which was definitely installed (visible when listing all the installed packages). There is a right way for arch linux users of installing python packages (as it was already explained here by Emanuel Fontelles). In my case the solution was just to uninstall the remaining not-working package (in my case "nest_asyncio") and then installing it again using the following command:
sudo pacman - s python-"nest_asyncio .
这解决了所有的问题。
这工作! !
这通常发生在模块安装到旧版本的python或其他目录时，不用担心，因为解决方案很简单。 - import module from模块所在目录。 你可以先导入python sys模块，然后从模块安装的路径导入
import sys
sys.path.append("directory in which module is installed")
import <module_name>
