I have a prototype written in Python that I need to port into Java to put into production. Python 2.7.10 has been installed using miniconda. The prototype uses a 3rd party library nltk that I installed using pip.
To void rewriting the code from scratch, at least initially, I want to first try call the prototype code directly from Java using jython.
When I try executing a command like
java -jar jython-standalone-2.7.0.jar myPrototype.py
I get
Traceback (most recent call last):
File "myPrototype.py", line 4, in <module>
from nltk import AlignedSent
ImportError: No module named nltk
It works fine when I run python myPrototype.py.
Is there a way of configuring my jython install so that it can find all 3rd party packages that I've added to my python install? I realize that some of those might not run in jython but at least I want to have access to those that do.
The bulk of NLTK is Python code so you should be able to use it from Jython as long as it's in your module search path. If you are on unix just add a link to your nltk in site-packages to the current folder. Or look into the documentation here: http://www.jython.org/jythonbook/en/1.0/ModulesPackages.html
NLTK needs to be able to load its data for some stuff. You may want to either make al link to your nltk_data from your home to the current folder or see this answer to set it from code: How to config nltk data directory from code?
Related
Im attempting to use the numpy module in webots but whatever I try I always get
INFO: assignment_2_controller_2: Starting controller: python3.6 -u "assignment_2_controller_2.py"
[assignment_2_controller_2] Traceback (most recent call last):
[assignment_2_controller_2] File "assignment_2_controller_2.py", line 4, in <module>
[assignment_2_controller_2] import numpy
[assignment_2_controller_2] ModuleNotFoundError: No module named 'numpy'
WARNING: 'assignment_2_controller_2' controller exited with status: 1.
I have installed numpy with both pip2 and pip3 and neither seem to have made any difference and the package shows up in ~/.local/lib/python3.6/site-packages. I can also confirm that this module works in the python editor and in other python files.
Is there perhaps something I need to change in webots python Makefile or perhaps in my environment variables?
Edit:
Printing sys.path shows
'/snap/webots/14/usr/share/webots/lib/controller/python36', '/snap/webots/14/usr/lib/python36.zip', '/snap/webots/14/usr/lib/python3.6', '/snap/webots/14/usr/lib/python3.6/lib-dynload', '/snap/webots/14/usr/lib/python3/dist-packages'
I installed webots using snap but why wouldnt it use the python dictated by the PATH environment variable?
Fix:
By the looks of it snap creates a contained filesystem for webots to run in by design in which it installed its own python binaries. I therefore uninstalled webots with snap and then installed from the .deb file off their website and now it works fine.
Webots installed from the Snap package is running in a kind of sandbox, it is therefore using the version of Python distributed with the snap package (which you can't alter).
As explained in the documentation, you might use external controllers to launch yourself the controller instead of letting Webots starting it. This way you can chose which version of Python you want to use: https://cyberbotics.com/doc/guide/installation-procedure#installing-the-snap-package
Alternatively, you can use a different way to install Webots (from the Debian or archive package). The other installations are not coming with Python and are using the system Python.
There is a bunch of pre-made code I simply have to run. However, the code requires the module NumPy, which for some reason is not installed. I am using Geany for the Python code, and when I click compile, the console states:
"Traceback (most recent call last):
File "chi2Fit.py", line 1, in <module>
import numpy as np
ImportError: No module named 'numpy'
I really tried to look it up, and I found the zipped NumPy packages on SourceForge, but I cannot install them. I am using Windows 10 (Virtual Machine is buggy, unfortunately). I usually run my Python programs by compiling them directly and don't use the commands within the console (so honestly I don't know how to open the command line. Yes, I am a beginner). What is the explanation?
Geany is just an editor, with the ability to run commands and such from menus and buttons. So you should be able to run this code 'by compiling them directly'. If that works while the 'geany compile' does not, then you need to check the 'compile' command. Is it using the right Python?
'compile' really doesn't make sense with Python code. You are just executing a script.
NumPy is a large package that does include compiled components. So installing it requires more than downloading a ZIP file. On Windows it is usually best to install one of the precompiled packages. Anaconda is popular one.
But we know nothing about this pre-made code, and whether it has included the necessary modules or not. You need to find out from the source of that code what is needed to run it.
You need to figure out how to install NumPy. It depends on what OS you are using.
There are pre-compiled packages for Windows. There is plenty of information here on SO (e.g., Installing NumPy on Windows) or you can use Google.
This is the first time I have attempted to use anything other than what's provided by python.
I have recently gotten into pythons provided Tkinter, though due to some issues I decided to use another GUI, and heard that PyQt was highly recommended, so I downloaded that and looked into various tutorials. In these tutorials, I cannot seem to execute any of the import statements in said tutorials that relate to PyQt, primarily PyQt5 (I have checked I have the correct version number by the way).
So for instance:
import PyQt5
raises the error:
Traceback (most recent call last):
File "/Users/MEBO/PycharmProjects/Music/testing.py", line 1, in <module>
import Qt
ImportError: No module named 'Qt'
[Finished in 0.1s with exit code 1]
I have a lot of research into this. I've heard people talk of using pip to install modules, and I have done this be safe (as well as downloading it from the internet), I've tried changing the project interpreter to versions Python3/ 2.7/ 2.6, appending the path name to the sys.path directory, (which I really know nothing about to be honest, I was hoping I'd get lucky), though nothing seems to work.
Are you supposed to be able to just import a module off the bat, or do you have to set some things up first?
For windows download the package and extract it to (path where python installed)\Python27\Lib and then try to import.
Specific to PyQt
This package cannot just be downloaded and imported, it must be built because it is not pure python, it uses Qt (C++) and requires dependancies. Read this tutorial on installation.
There is also a very complete python package distribution, Anaconda, that includes pyqt and much more. Almost all the packages I ever looked at are in there.
In general to pure python code
In other cases, if you place modules/code that has been download into the directory that your python script is run from, you can import off the bat, or you can append/insert any folder to the sys.path.
# importer will search here last
sys.path.append('/path/to/code/')
# importer will search here second, right after script's directory
# this can be useful to override a module temporarily...
sys.path.insert(1,'/path/to/code/')
I am on a Windows 7 64bit machine, using Python 2.7 and I am trying to use the python database library in robotframework. I have previously used a java library file but now I want to use the python library.
I have gone to github and downloaded version 0.6.
I have also installed a setup file and MySQL-python from here
However when I try to install the database library (using python setup.py build) I get the following error:
Traceback (most recent call last):
File "setup.py", line 25, in <module>
from DatabaseLibrary import __version__
File "src\DatabaseLibrary\__init__.py", line 15, in <module>
from connection_manager import ConnectionManager
File "src\DatabaseLibrary\connection_manager.py", line 16, in <module>
from robot.api import logger
ImportError: No module named api
Why do I not have robot.api and how do I get it and install it? Or is there an easier way to install the python database library?
It seems that the Database library uses Robot Framework internals, but does not list Robot Framework as it's dependency. The robot.api package was introduced in RF 2.6, so upgrading/installing the latest Robot Framework (from project pages) should resolve your issue
First ensure the integrity of your module before trying to install. In order to install a module using distutils (setup.py) you need to run this command as an administrator:
python setup.py install
That should run the setup and report back to you any missing dependencies.
Alternatively, you can install PIP from this location: PIP Project home page. Their page provides instructions how to install PIP, it's a package manager for Python, similar to PEAR for PHP, CPAN for Perl or gem for ruby. When you have it installed you can install packages with this command:
pip install <module>
The issue was I did not have the "API" folder in the "Robot" folder in "Python27\Lib\site-packages" as I did not have the latest version of RF. And logger is a new logging API for Robot Framework 2.6 since Oct 2011. (As janne as pointed out)
Two fixes for this issue seem to be:
Tested and worked but not recommended unless you dont want to update RF: Edit the 2 files "connection_manager.py" and "query.py" in "robotframework-databaselibrary-0.6" so that there is no dependency on the Robotframework logger. This is a easy and quick edit, where you replace the "from robot.api import logger" to "import logging" and "logger" to "logging"
See "http://robotframework.googlecode.com/hg/doc/userguide/RobotFrameworkUserGuide.html#programmatic-logging-apis" for more detail.
Reinstall Robotframework and ensure the "API" folder is created. This is recommended as it is the best approach.
(Added as an answer as too long for a comment)
I have just installed OpenCV on my Windows 7 machine. As a result, I get a new directory:
C:\OpenCV2.2\Python2.7\Lib\site-packages
In this directory, I have two files: cv.lib and cv.pyd.
Then I try to use the opencv from Python. I do the following:
import sys
sys.path.append('C:\OpenCV2.2\Python2.7\Lib\site-packages')
import cv
As a result I get the following error message:
File "<stdin>", line 1, in <module>
ImportError: DLL load failed: The specified module could not be found.
What am I doing wrong?
ADDED
As it was recommended here, I have copied content of C:\OpenCV2.0\Python2.6\Lib\site-packages to the C:\Python26\Lib\site-packages. It did not help.
ADDED 2
My environment variables have the following values:
Path=C:\Program Files\MiKTex\miktex\bin;C:\OpenCV2.2\bin;C:\Python26;
PYTHONPATH=C:\OpenCV2.2\Python2.7\Lib\site-packages
Do I need to change something? Do I need to add something?
ADDED 3
I think my question is general: How to use a library? Probably I need to find a *.ddl file somewhere? Then I need to use the name of the directory containing this file as a value to some environment variables? Or maybe I need to use sys.addpath? I also need to know how the way to call the library is related to the name of the file that contains the library.
ADDED 4
It is interesting that when I type import cv, I get:
ImportError: DLL load failed: The specified module could not be found.
But when I type import opencv I get:
ImportError: No module named opencv
ADDED 5
It has been suggested that I usthe e inconsistent version of python. In more details, OpenCV tries to use Python2.7 and I had Python2.6. So, I have installed Python 2.7. It makes difference. Now I do not have the old error message, but I have a new one:
ImportError: numpy.core.multiarray failed to import
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: numpy.core.multiarray failed to import
ADDED 6
I have managed to resolve the problem by installing numpy. It took some time because I did not realized that there are different numpy installer corresponding to different versions of Python. Some details can be found in my answer to my own question (see bellow).
The problem was resolved. The following steps has been done:
A new version of python (version 2.7) has been installed.
After that I still was unable to run OpenCV because I had some problems with the numpy library.
I tired to install numpy but the installer did not see my new version of the Python.
I deleted the old version of Python as well as links to the old version in the Path system vatriable.
After that numpy installer was not able to finish the installation.
I have realized that I need to run another numpy installer that is associated with the Python 2.7. It can be found here.
Finally everything worked. I was able to "import cv".
I suspect you have the same problem I've run into. If you have a 64-bit version of Python, it cannot load 32-bit DLLs. OpenCV currently only ships 32-bit binaries. If you want 64-bit .pyd and .dll files, you have to compile them yourself. There are some instructions on the OpenCV Wiki, but it's not for the faint of heart. Expect to have a substantial time investment.
The easiest solution is to:
Uninstall 64-bit Python
Install a 32-bit distribution.
The PythonXY distribution includes pyopencv -- a good set of OpenCV hooks. The only limitation is that it's 32-bit, so don't make plans to process gigapixel astronomy data with it! ;)
If you must have the 64-bit version, follow these instructions to get it OpenCV to compile with Visual Studio 2010. There's a discussion on stackoverflow that describes building 64-bit apps with VC Express.
EDIT: OpenCV now ships with 64-bit Python binaries. The .dll files need to go somewhere in your path (I put them in the scripts folder), and the .pyd files go in your site-packages directory.
I had trouble interfacing OpenCV with Python, and I was looking all over the place for help. Here's what worked for me. I basically followed this post: http://opencvpython.blogspot.com/2012/05/install-opencv-in-windows-for-python.html. After downloading and extracting OpenCV 2.4.6, you basically get a folder called "opencv" with a bunch of stuff in it. Navigate to build->python->2.7. Inside, there is only one file called "cv2.pyd". I copied this file and pasted it in "python-2.7.5\Lib\site-packages". I'm actually using the Spyder IDE, and it works fine. In the python interpreter, typing in "import cv" worked for me.
Maybe you should edit your environment variable
right click on the "My Computer" or something like this, click on properties.
In the properties window click on the Advanced tab.
Then, the environment variables button.
Change the path.