Reputation: 21058

Python error "ImportError: No module named"

Python is installed in a local directory.

My directory tree looks like this:

(local directory)/site-packages/toolkit/interface.py

My code is in here:

(local directory)/site-packages/toolkit/examples/mountain.py

To run the example, I write python mountain.py, and in the code I have:

from toolkit.interface import interface

And I get the error:

Traceback (most recent call last):
  File "mountain.py", line 28, in ?
    from toolkit.interface import interface
ImportError: No module named toolkit.interface

I have already checked sys.path and there I have the directory /site-packages. Also, I have the file __init__.py.bin in the toolkit folder to indicate to Python that this is a package. I also have a __init__.py.bin in the examples directory.

I do not know why Python cannot find the file when it is in sys.path. Any ideas? Can it be a permissions problem? Do I need some execution permission?

Upvotes: 645

Answers (30)

orip

Reputation: 75507

To mark a directory as a package you need a file named __init__.py.

Upvotes: 19

MonoThreaded

Reputation: 12063

Using PyCharm (part of the JetBrains suite) you need to define your script directory as Source:
Right Click > Mark Directory as > Sources Root

Upvotes: 35

qrort

Reputation: 13

I had similar problem. In my case, the following thing happened:

I had a self-made package installed, and it had toolkit directory in it. Therefore, when Python looked for interface module, it searched for it not in the directory on sys.path, but in the directory of preinstalled package.

Having uninstalled this package via pip, everything got fixed for me.

Upvotes: 0

Specterace

Reputation: 1215

I ran into something very similar when I did this exercise in LPTHW; I could never get Python to recognise that I had files in the directory I was calling from. But I was able to get it to work in the end. What I did, and what I recommend, is to try this:

(NOTE: From your initial post, I am assuming you are using an *NIX-based machine and are running things from the command line, so this advice is tailored to that. Since I run Ubuntu, this is what I did)

Change directory (cd) to the directory above the directory where your files are. In this case, you're trying to run the mountain.py file, and trying to call the toolkit.interface.py module, which are in separate directories. In this case, you would go to the directory that contains paths to both those files (or in other words, the closest directory that the paths of both those files share). Which in this case is the toolkit directory.
When you are in the toolkit directory, enter this line of code on your command line:

export PYTHONPATH=.

This sets your PYTHONPATH to ".", which basically means that your PYTHONPATH will now look for any called files within the directory you are currently in, (and more to the point, in the sub-directory branches of the directory you are in. So it doesn't just look in your current directory, but in all the directories that are in your current directory).
After you've set your PYTHONPATH in the step above, run your module from your current directory (the toolkit directory). Python should now find and load the modules you specified.

Upvotes: 115

questionto42

Reputation: 9590

In the ubuntu apt-get installer, the python3 versions of packages are usually named

python3-XYZ

and the python2 versions

python-XYZ

As a rule of thumb, try python3-XYZ or python-XYZ of the package that is mentioned in the error message. And just guessing is not needed, search through the apt cache with a RegEx. Then:

$ apt-cache search "python.*toolkit.*interface"
python3-cli-helpers - easy command-line apps with Python
python3-exam - Python module to help write better tests
python3-fltk - Python wrapper for the Fast Light Toolkit
python3-mpltoolkits.basemap - matplotlib toolkit to plot on map projections (Python 3)
python3-nltk - Python3 libraries for natural language processing
python3-onnx - Open Neural Network Exchange (ONNX) (Python)
python3-paraview - Parallel Visualization Application. python-support
python3-pyswarms - research toolkit for particle swarm optimization in Python
python3-wxgtk-media4.0 - Python 3 interface to the wxWidgets Cross-platform C++ GUI toolkit (wx.media)
python3-wxgtk-webview4.0 - Python 3 interface to the wxWidgets Cross-platform C++ GUI toolkit (wx.html2)
python3-wxgtk4.0 - Python 3 interface to the wxWidgets Cross-platform C++ GUI toolkit
python3-xapian - Xapian search engine interface for Python3
wxglade - GUI designer written in Python with wxPython

It does not find it.

Mind that this apt-get trick will sometimes be needed for dependent packages as well or instead.

I had the same error message for the flask package for python2.7 and it vanished when I tried:

sudo apt-get install python-flask

Thus, try:

sudo apt-get install python-[YOURPYTHONVERION]-[YOURERRORPACKAGE]

or check mentioned dependencies.

Upvotes: 0

nextloop

Reputation: 342

another cause makes this issue

file.py

#!/bin/python
from bs4 import BeautifulSoup

if your default python is pyyhon2

$ file $(which python)
/sbin/python: symbolic link to python2

file.py need python3, for this case(bs4)
you can not execute this module with python2 like this:

$ python file.py
# or
$ file.py
# or
$ file.py # if locate in $PATH

Tow way to fix this error,

# should be to make python3 as default by symlink
$ rm $(which python) && ln -s $(which python3) /usr/bin/python
# or use alias
alias python='/usr/bin.../python3'

or change shebang in file.py to

#!/usr/bin/...python3

Upvotes: 0

PatrickT

Reputation: 10530

If you're on a tight deadline and all else fails:

import sys
import os
wd = '/path/to/current/script/'
sys.path.append(wd)
os.chdir(wd)
print(os.getcwd())
print(sys.path)

Upvotes: 1

juanignaciosl

Reputation: 3573

For me, running the file as a module helped.

Instead of

python myapp/app.py

using

python -m myapp.app

It's not exactly the same but it might be a better approach in some cases.

Upvotes: 6

Ryan Mckenna

Reputation: 104

The file encoding of all your python files must be utf-8.

See here: https://github.com/jupyter/notebook/issues/3166#issuecomment-581332097

Upvotes: 0

skittlebiz

Reputation: 376

Using sys.path.append worked for me, as mentioned in an answer already. At first I thought it was not working until I realized I had a space before the directory path. So be sure you have no typos or spaces before you path(s)

Upvotes: 0

libin

Reputation: 457

I have a similar problem. I created a new virtual environment named python3.6.

conda create -n python3.6 python=3.6
pip install pandas

everything is ok, but when I run script, a error occurred

ModuleNotFoundError: No module named 'pandas'

I found that the metadata of the Python package and cache of pip has been updated, but it does not actually download the pandas package. so I try reinstall by pip,

pip uninstall pandas --no-cache-dir
pip install pandas

This solved it.

Upvotes: 0

Ghoti

Reputation: 759

I've found that changing the name (via GUI) of aliased folders (Mac) can cause issues with loading modules. If the original folder name is changed, remake the symbolic link. I'm unsure how prevalent this behavior may be, but it was frustrating to debug.

Upvotes: 1

michael-slx

Reputation: 771

If you are using a setup script/utility (e.g. setuptools) to deploy your package, don't forget to add the respective files/modules to the installer.

When supported, use find_packages() or similar to automatically add new packages to the setup script. This will absolutely save you from a headache, especially if you put your project aside for some time and then add something later on.

import setuptools

setuptools.setup(
    name="example-pkg",
    version="0.0.1",
    author="Example Author",
    author_email="[email protected]",
    description="A small example package",
    packages=setuptools.find_packages(),
    classifiers=[
        "Programming Language :: Python :: 3",
        "Operating System :: OS Independent",
    ],
    python_requires='>=3.6',
)

(Example taken from setuptools documentation)

Upvotes: 2

Michał Zawadzki

Reputation: 752

In my case, I was using sys.path.insert() to import a local module and was getting module not found from a different library. I had to put sys.path.insert() below the imports that reported module not found. I guess the best practice is to put sys.path.insert() at the bottom of your imports.

Upvotes: 1

Poli

Reputation: 77

In linux server try dos2unix script_name

(remove all (if there is any) pyc files with command find . -name '*.pyc' -delete)

and re run in the case if you worked on script on windows

Upvotes: 1

kev

Reputation: 2881

For me, it was something really stupid. I installed the library using pip3 install but was running my program as python program.py as opposed to python3 program.py.

Upvotes: 26

AKJ

Reputation: 1048

To all those who still have this issue. I believe Pycharm gets confused with imports. For me, when i write 'from namespace import something', the previous line gets underlined in red, signaling that there is an error, but works. However ''from .namespace import something' doesn't get underlined, but also doesn't work.

Try

try:
    from namespace import something 
except NameError:
    from .namespace import something

Upvotes: 8

avp

Reputation: 3350

You are reading this answer says that your __init__.py is in the right place, you have installed all the dependencies and you are still getting the ImportError.

I was facing a similar issue except that my program would run fine when ran using PyCharm but the above error when I would run it from the terminal. After digging further, I found out that PYTHONPATH didn't have the entry for the project directory. So, I set PYTHONPATH per Import statement works on PyCharm but not from terminal:

export PYTHONPATH=$PYTHONPATH:`pwd`  (OR your project root directory)

There's another way to do this using sys.path as:

import sys
sys.path.insert(0,'<project directory>') OR
sys.path.append('<project directory>')

You can use insert/append based on the order in which you want your project to be searched.

Upvotes: 47

Scott

Reputation: 5848

This worked for me: Created __init__.py file inside parent folder (in your case, inside site-packages folder). And imported like this:

from site-packages.toolkit.interface import interface

Hope it will be useful for you as well !

Upvotes: 0

Yuanhui

Reputation: 479

In my case, because I'm using PyCharm and PyCharm create a 'venv' for every project in project folder, but it is only a mini env of python. Although you have installed the libraries you need in Python, but in your custom project 'venv', it is not available. This is the real reason of 'ImportError: No module named xxxxxx' occurred in PyCharm. To resolve this issue, you must add libraries to your project custom env by these steps:

In PyCharm, from menu 'File'->Settings
In Settings dialog, Project: XXXProject->Project Interpreter
Click "Add" button, it will show you 'Available Packages' dialog
Search your library, click 'Install Package'
Then, all you needed package will be installed in you project custom 'venv' folder.

Enjoy.

Upvotes: 5

user256717

Reputation:

In my case I was including the path to package.egg folder rather than the actual package underneath. I copied the package to top level and it worked.

Upvotes: 0

ioaniatr

Reputation: 277

I had the same problem (Python 2.7 Linux), I have found the solution and i would like to share it. In my case i had the structure below:

Booklet
-> __init__.py
-> Booklet.py
-> Question.py
default
-> __init_.py
-> main.py

In 'main.py' I had tried unsuccessfully all the combinations bellow:

from Booklet import Question
from Question import Question
from Booklet.Question import Question
from Booklet.Question import *
import Booklet.Question
# and many othet various combinations ...

The solution was much more simple than I thought. I renamed the folder "Booklet" into "booklet" and that's it. Now Python can import the class Question normally by using in 'main.py' the code:

from booklet.Booklet import Booklet
from booklet.Question import Question
from booklet.Question import AnotherClass

From this I can conclude that Package-Names (folders) like 'booklet' must start from lower-case, else Python confuses it with Class names and Filenames.

Apparently, this was not your problem, but John Fouhy's answer is very good and this thread has almost anything that can cause this issue. So, this is one more thing and I hope that maybe this could help others.

Upvotes: 1

Rich

Reputation: 790

My problem was that I added the directory with the __init__.py file to PYTHONPATH, when actually I needed to add its parent directory.

Upvotes: 3

Badr Bellaj

Reputation: 12871

an easy solution is to install the module using python -m pip install <library-name> instead of pip install <library-name> you may use sudo in case of admin restrictions

Upvotes: 21

liushuaikobe

Reputation: 2190

If you have tried all methods provided above but failed, maybe your module has the same name as a built-in module. Or, a module with the same name existing in a folder that has a high priority in sys.path than your module's.

To debug, say your from foo.bar import baz complaints ImportError: No module named bar. Changing to import foo; print foo, which will show the path of foo. Is it what you expect?

If not, Either rename foo or use absolute imports.

Upvotes: 8

Mr_and_Mrs_D

Reputation: 34046

My two cents:

enter image description here

Spit:

Traceback (most recent call last):
      File "bash\bash.py", line 454, in main
        import bosh
      File "Wrye Bash Launcher.pyw", line 63, in load_module
        mod = imp.load_source(fullname,filename+ext,fp)
      File "bash\bosh.py", line 69, in <module>
        from game.oblivion.RecordGroups import MobWorlds, MobDials, MobICells, \
    ImportError: No module named RecordGroups

This confused the hell out of me - went through posts and posts suggesting ugly syspath hacks (as you see my __init__.py were all there). Well turns out that game/oblivion.py and game/oblivion was confusing python which spit out the rather unhelpful "No module named RecordGroups". I'd be interested in a workaround and/or links documenting this (same name) behavior -> EDIT (2017.01.24) - have a look at What If I Have a Module and a Package With The Same Name? Interestingly normally packages take precedence but apparently our launcher violates this.

EDIT (2015.01.17): I did not mention we use a custom launcher dissected here.

Upvotes: 6

peter karasev

Reputation: 2614

In my case, the problem was I was linking to debug python & boost::Python, which requires that the extension be FooLib_d.pyd, not just FooLib.pyd; renaming the file or updating CMakeLists.txt properties fixed the error.

Upvotes: 4

Renaud

Reputation: 16521

On *nix, also make sure that PYTHONPATH is configured correctly, especially that it has this format:

 .:/usr/local/lib/python

(Mind the .: at the beginning, so that it can search on the current directory, too.)

It may also be in other locations, depending on the version:

 .:/usr/lib/python
 .:/usr/lib/python2.6
 .:/usr/lib/python2.7 and etc.

Upvotes: 48

Eduardo

Reputation: 21058

I solved my own problem, and I will write a summary of the things that were wrong and the solution:

The file needs to be called exactly __init__.py. If the extension is different such as in my case .py.bin then Python cannot move through the directories and then it cannot find the modules. To edit the files you need to use a Linux editor, such as vi or nano. If you use a Windows editor this will write some hidden characters.

Another problem that was affecting it was that I had another Python version installed by the root, so if someone is working with a local installation of python, be sure that the Python installation that is running the programs is the local Python. To check this, just do which python, and see if the executable is the one that is in your local directory. If not, change the path, but be sure that the local Python directory is before than the other Python.

Upvotes: 26

Toivo Säwén

Reputation: 2042

I had the same error. It was caused by somebody creating a folder in the same folder as my script, the name of which conflicted with a module I was importing from elsewhere. Instead of importing the external module, it looked inside this folder which obviously didn't contain the expected modules.

Upvotes: 0

Python error &quot;ImportError: No module named&quot;

Answers (30)

another cause makes this issue

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Python error "ImportError: No module named"