I just have a quick question about an error I've been getting when I try to import:
from psychopy import gui
So if I try to import this code in one program I have no problems, however, if I try to import it in another I get:
"ImportError: cannot import name gui"
Does anyone know why this might be happening? Why does it work for one problem, but not the other? Also, I feel like it wasn't doing this before, and it just started suddenly. Any advice would be greatly appreciated.
UPDATE: I think Jon's answer is the correct one. If I was right, you should get an error "no module named psychopy".
Given that you tagged this question with the psychopy tag, my guess is that it works if you run it from the psychopy app and that it doesn't work if you run it from another editor or command line.
The reason is that psychopy is currently shipped as a bundle that comes with it's own python and a lot of modules/dependencies, including psychopy. The system is not made aware of these modules via the PYTHONPATH.
You can make them available system-wide by either (1) following the steps outlined here or (2) use the conda based installation described in this post in the psychopy-dev list. The latter feature is still work in progress but will probably eventually mature to be the default install option.
I think the other answers are wrong ;-)
I think if you had a different virtual environment or installation then the error in your code would indicate "No module named psychopy"
The fact that it finds something called psychopy but no sub-module called gui is a different problem. Often this occurs if you have a folder or file called psychopy next to you current working directory (eg. next to where you launch the script). Then Python thinks that's the psychopy module but can't find gui within it.
So, do you have a folder called psychopy? Rename it psychopyStuff.
I think you are using different virtual environments for both the projects, and so the package is installed in one virtualenv, and not in the other.
To verify this is the case, do a pip freeze in both the projects and compare the results.
If there is a single environment, the output will be same, otherwise the outputs will be different amongst the two.
Related
I have a question regarding simple imports that I cannot get my head around.
Take a look at the attached screenshot to see my project layout.
The file somefile.py imports the class SayHello from a file called someclass.py and calls it. someotherfile.py does the exact same thing. They both use from someclass import SayHello.
In Pycharm both files run. However, From the command line or from VSCode somefile.py runs, but someotherfile.py errors out with the following error:
ModuleNotFound: No module named 'someclass'.
I believe it has something to do with PYTHONPATH/environment variables or something like that, but every explanation I have read has confused me thus far (Even this one which I thought was going to set me strait Relative imports for the billionth time).
Can someone explain in simple terms what is happening here? What is Pycharm doing by default that other editors are not such that my imported modules are found? How can I make someotherfile.py work in VSCode without modifying it?
Thanks in advance!
Pycharm adds your project directory into python paths by default. See configuration of "Pycharm run" that you execute and you shall see few checkboxes like
If those checked Pycharm creates PYTHONPATH environment variable for you that instructs Python where to look for someclass module.
You will have to configure VSCode to define PYTHONPATH environemnt variable for python command you run and include your root project directory path on it.
TLDR: Mess with the line starting with ./automated pointing it to various directories in your project until it works haha.
Long rambling answer: Alright now that I am not in a frenzy from trying to figure this out and it has been a day, I feel like I can make a conherint response (lets see if that is true).
So my original answer was an attempt to simplify my problem into what I thought was the issue due to a ModuleNotFound error I was getting. I had been trying to get unittests in Python inside of Visual Studio code to work (hint hint just use Pycharm it just works out of the box in there), but the integrated testing feature or whatever could not find my tests giving ModuleNotFound as the reason.
The solution to my problem actually just concerned the line ./automated-software-testsing-with-python/blog.
In the below screenshot the relevant part is ./automated-software-testing-with-python/blog.
This is it when it is correctly configured (My tests work Woo hoo!)
Now you can go ahead and read the official documentation for what this line is doing, but I am convinced that the documentation is wrong. Due to how my code is structured and how my files are named, what the documentation says its looking for definitely does not exist. But that is another can of worms...
I actually got it to work by accident. Originally when you go though the wizard to set up what's in that screenshot above, it defaulted to ./automated-software-testing-with-python which did not work. I then manually edited it to something else that was not the below screenshot hoping to get it to work.
It was only when I pointed it to that blog directory on accident (thinking I was in a different file due to trying to debug this for hours and hours in a blind rage) that it ended up working.
I did a bunch of PYTHONPATH manipulation and Environment Variable mumbo jumbo, and I originally thought that that had an effect, but when I cloned my repot to my other machine (which did not have any of that Environment Variable PYTHONPATH stuff going on) it worked too (again, provided that the line in question pointed to blog.
Ok hopefully that might help somone someday, so I'll end it there. Not to end on a bitter sounding zinger, but I will never cease be amazed by how doing such simple things such as configuring the most basic unit test can be so difficult in our profession haha. Well now I can start working. Thanks for the help to those who answered!
I use intellij with python plugin.
when I want to import python libs like
import random
I got editor error.
No module named random less... (Ctrl+F1)
This inspection detects names that should resolve but don't. Due to dynamic dispatch and duck typing, this is possible in a limited but useful number of cases. Top-level and class-level items are supported better than instance items.
when I run the code every thing is ok
what can I do to make the intelij recognize this libs?
You may have fixed this by now, but I was having the same problem and finally solved it, so I figured I'd post the solution for anyone who came here by Googling/Binging the error message:
I went to File > Project Structure > Modules, highlighted the main module, then pressed the plus sign and then "Python" under "Framework".
Hope that helps you or someone else.
may be my intellij version is different with you guys.
on Windows platform I fix this problem by:
1.File > Project Structure > Modules
2.on the module's dependencies panel,change the module SDK from JDK to python
3.done
I am being plagued by this error:
ImportError: No module named foo
It seems to come up somewhat randomly. I install various modules using PIP and sometimes they are found by import and sometimes they are not. What commands can I try to force the installation of these non-working modules into every possible nook and cranny to make sure that I always have access to them?
Or another question, what can I do to make this work?
Or another question, what diagnostics can I run to figure out what my real problem is?
New to Python, so excuse my lack of specific technical jargon. Pretty simple question really, but I can't seem to grasp or understand the concept.
It seems that a lot of modules require using pip or easy_install and running setup.py to "install" into your python installation or your virtualenv. What is the difference between installing a module and simply taking it and importing the into another script? It seems that you access the modules the same way.
Thanks!
It's like the difference between:
Uploading a photo to the internet
Linking the photo URL inside an HTML page
Installing puts the code somewhere python expects those kinds of things to be, and the import statement says "go look there for something named X now, and make the data available to me for use".
For a single module, it usually doesn't make any difference. For complicated webs of modules, though, an installation program may do many things that wouldn't be immediately obvious. For example, it may also copy data files into locations the new modules can find them, put executables (binary libraries, or DLLs on Windws, for example) where the new modules can find them, do different things depending on which version of Python you have, and so on.
If deploying a web of modules were always easy, nobody would have written setup programs to begin with ;-)
I followed this guide to setup OpenCV 2.3.1 in Python 2.7 with Eclipse.
I also copied the libraries into my python folder:
http://i.snag.gy/J9RrC.jpg
Here is my Hello World program which runs correctly (creates a named window and displays the image) but Eclipse still shows syntax errors
every error says "Undefined variable from import"
Here are my python settings for this project:
http://i.snag.gy/KBXiB.jpg
http://i.snag.gy/KfTpF.jpg
Have I setup my PythonPath incorrectly? How can i get Eclipse to work properly?
Thanks
I had the same problem, everything ran correctly even though there were undefined import errors all over the place. I eventually solved it by adding 'cv' to the list of Forced Builtins: Window > Preferences > Pydev > Interpreter - Python > Forced Builtins > New.
This is how I came across the solution:
How to use code completion into Eclipse with OpenCV
I hope that this may help you too.
EDIT: FYI, according to the top answer here, if you're just getting started (like me!) it's almost certainly better to use the cv2 interface instead of the older one provided in cv2.cv. The author of that answer, Abid Rahman, has some tutorials that look pretty good. (end EDIT)
I used Debian's tools to install the python-opencv package. There was no .../dist-packages/opencv directory to be found, and the cv.py file contained only:
from cv2.cv import *
I'm fairly inexperienced with Python and completely so with Python access to external libraries, so this looked like some sort of workaround related to that. Not so, apparently. I followed Casper's link above, and found the solution that he used (which worked for me,) but I wasn't happy using "forced builtins" when I wasn't entirely sure of the consequences.
However, the second, lower-rated answer there is my preferred solution. Instead of
import cv
I'm using
import cv2.cv as cv
From what I can tell, this just removes the cv.py middleman from the import chain, if that makes sense. A save/close/reload of my script had Eclipse recognizing cv.LoadImageM as defined and autocompleting other things from OpenCV.
I'm reproducing that answer here because it seems cleaner to me and I found this question first when I searched for the answer to the same problem.
It would be helpful to show the error you're getting and your code. However, I suspect that the problem is that the syntax errors which PyDev shows are based on its own parsing of the code, which is much more simplistic that the actual python interpreter. If your code runs, then the apparently undefined variables must be defined, but the PyDev parser just can't see them and reports them as "undefined".
The cause of this is that OpenCV doesn't explicitly define its variables in a way which can be read by PyDev. Unfortunately I don't have an easy solution. I usually deal with the problem by using from ... import ... so that the error only appears once. If you want you could write a wrapper module which explicitly imports the variables into its local namespace, then import that module instead.