ImportError No module named when trying to run Python script

Question

I m trying to run a script that launches  amongst other things  a python script   I get a ImportError  No module named      however  if I launch ipython and import the same module in the same way through the interpreter  the module is accepted     What s going on  and how can I fix it   I ve tried to understand how python uses PYTHONPATH but I m thoroughly confused   Any help would greatly appreciated

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Had a similar problem  fixed it by calling python3 instead of python  my modules were in Python3 5

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Remove pathlib and reinstall it  Delete the pathlib in sitepackages folder and reinstall the pathlib package by using pip command   pip install pathlib

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This issue arises due to the ways in which the command line IPython interpreter uses your current path vs  the way a separate process does  be it an IPython notebook  external process  etc   IPython will look for modules to import that are not only found in your sys path  but also on your current working directory  When starting an interpreter from the command line  the current directory you re operating in is the same one you started ipython in  If you run  import os os getcwd      you ll see this is true   However  let s say you re using an ipython notebook  run os getcwd   and your current working directory is instead the folder in which you told the notebook to operate from in your ipython notebook config py file  typically using the c NotebookManager notebook dir setting    The solution is to provide the python interpreter with the path-to-your-module  The simplest solution is to append that path to your sys path list  In your notebook  first try   import sys sys path append  my path to module folder    import module-of-interest   If that doesn t work  you ve got a different problem on your hands unrelated to path-to-import and you should provide more info about your problem   The better  and more permanent  way to solve this is to set your PYTHONPATH  which provides the interpreter with additional directories look in for python packages modules  Editing or setting the PYTHONPATH as a global var is os dependent  and is discussed in detail here for Unix or Windows

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The main reason is the sys paths of Python and IPython are different    Please refer to lucypark link  the solution works in my case  It happen when install opencv by   conda install opencv  And got import error in iPython  There are three steps to solve this issue   import cv2 ImportError        1  Check path in Python and iPython with following command   import sys sys path   You will find different result from Python and Jupyter  Second step  just use sys path append  to fix the missed path by try-and-error    2  Temporary solution  In iPython   import sys sys path append   home osboxes miniconda2 lib python2 7 site-packages   import cv2   the ImportError    issue solved  3  Permanent solution  Create an iPython profile and set initial append   In bash shell   ipython profile create     CHECK the path prompted   and edit the prompted config file like my case vi  home osboxes  ipython profile default ipython kernel config py   In vi  append to the file   c InteractiveShellApp exec lines       import sys  sys path append   home osboxes miniconda2 lib python2 7 site-packages        DONE

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Before installing ipython  I installed modules through easy install  say sudo easy install mechanize   After installing ipython  I had to re-run easy install for ipython to recognize the modules

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If you are running it from command line  sometimes python interpreter is not aware of the path where to look for modules   Below is the directory structure of my project    project apps     project tests      I was running below command    gt  gt  cd project   gt  gt  python tests my test py   After running above command i got below error  no module named lib   lib was imported in my test py  i printed sys path and figured out that path of project i am working on is not available in sys path list  i added below code at the start of my script my test py    import sys import os  module path   os path abspath os getcwd         if module path not in sys path              sys path append module path    I am not sure if it is a good way of solving it but yeah it did work for me

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This is probably caused by different python versions installed on your system  i e  python2 or python3    Run command   pip --version and   pip3 --version to check which pip is from at Python 3x   E g  you should see version information like below   pip 19 0 3 from  usr local lib python3 7 site-packages pip  python 3 7    Then run the example py script with below command    python3 example py

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Doing sys path append  my-path-to-module-folder   will work  but to avoid having to do this in IPython every time you want to use the module  you can add export PYTHONPATH  my-path-to-module-folder  PYTHONPATH  to your    bash profile file

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Happened to me with the directory utils  I was trying to import this directory as    from utils import somefile   utils is already a package in python  Just change your directory name to something different and it should work just fine

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This kind of errors occurs most probably due to python version conflicts  For example  if your application runs only on python 3 and you got python 2 as well  then it s better to specify which version to use  For example use  python3         instead of   python

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I have found that the solution to this problem was extensively documented here   https   jakevdp github io blog 2017 12 05 installing-python-packages-from-jupyter   Basically  you must install the packages within the Jupyter environment  issuing shell commands like     sys executable  -m pip install numpy   Please check the above link for an authoritative full answer

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Solution without scripting    Open Spyder -  Tools -  PYTHONPATH manager Add Python paths by clicking  Add Path   E g   C  Users User AppData Local Programs Python Python37 Lib site-packages  Click  Synchronize     to allow other programs  e g  Jupyter Notebook  use the pythonpaths set in step 2  Restart Jupyter if it is open

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Make sure they are both using the same interpreter  This happened to me on Ubuntu     ipython3 -c  import sys  print sys version   3 4 2  default  Jun 19 2015  11 34 49   n GCC 4 9 1     python3 -c  import sys  print sys version   3 3 0  default  Nov 27 2012  12 11 06   n GCC 4 6 3    And sys path was different between the two interpreters  To fix it  I removed Python 3 3

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Just create an empty python file with the name   init   py under the folder which showing error  while you running the python project

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import sys sys path append   Users  user  Library Python 3 7 lib python site-packages   import ta

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This is how I fixed it    import os import sys module path   os path abspath os getcwd             if module path not in sys path      sys path append module path

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I found yet another source of this discrepancy   I have ipython installed both locally and in commonly in virtualenvs  My problem was that  inside a newly made virtualenv with ipython  the system ipython was picked up  which was a different version than the python and ipython in the virtualenv  a 2 7 x vs  a 3 5 x   and hilarity ensued   I think the smart thing to do whenever installing something that will have a binary in yourvirtualenv bin is to immediately run rehash or similar for whatever shell you are using so that the correct python ipython gets picked up   Gotta check if there are suitable pip post-install hooks

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This answer applies to this question if   You don t want to change your code You don t want to change PYTHONPATH permanently   Temporarily modify PYTHONPATH  path below can be relative  PYTHONPATH  path to dir python script py

[python] "ImportError: No module named" when trying to run Python script

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