scipy: Missing DLL dependencies, scipy 1.6.3

My issue is about FileNotFoundError thrown when I try to import scipy to python console. I have scipy version 1.6.3 installed from conda-forge:

scipy                     1.6.3            py38he847743_0    conda-forge

The DLL file mentioned in the error message below exists on my system.

Reproducing code example:

import scipy

Error message:

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "C:\Program Files (x86)\JetBrains\PyCharm 2021.1.1\plugins\python\helpers\pydev\_pydev_bundle\pydev_import_hook.py", line 21, in do_import
    module = self._system_import(name, *args, **kwargs)
  File "C:\Users\kalivoda\.conda\envs\bci-classifier\lib\site-packages\scipy\__init__.py", line 130, in <module>
    from . import _distributor_init
  File "C:\Program Files (x86)\JetBrains\PyCharm 2021.1.1\plugins\python\helpers\pydev\_pydev_bundle\pydev_import_hook.py", line 21, in do_import
    module = self._system_import(name, *args, **kwargs)
  File "C:\Users\kalivoda\.conda\envs\bci-classifier\lib\site-packages\scipy\_distributor_init.py", line 59, in <module>
    WinDLL(os.path.abspath(filename))
  File "C:\Users\kalivoda\.conda\envs\bci-classifier\lib\ctypes\__init__.py", line 373, in __init__
    self._handle = _dlopen(self._name, mode)
FileNotFoundError: Could not find module 'C:\Users\kalivoda\.conda\envs\bci-classifier\lib\site-packages\scipy\.libs\libbanded5x.EHDKC2XVYTQQ5MALRS6XN2CUSS6SRL6P.gfortran-win_amd64.dll' (or one of its dependencies). Try using the full path with constructor syntax.

Numpy/Python version information:

1.19.5 sys.version_info(major=3, minor=8, micro=8, releaselevel='final', serial=0)

About this issue

Original URL
State: closed
Created 3 years ago
Comments: 25 (12 by maintainers)

Links to this issue

python - FileNotFoundError: Could not find module when using jupyter notebook - Stack Overflow

Most upvoted comments

scipy\.libs\libbanded5x.EHDKC2XVYTQQ5MALRS6XN2CUSS6SRL6P.gfortran-win_amd64.dll is a DLL that comes from a wheel, not a conda-forge package. So you have mixed up pip install scipy and conda install scipy here - that will lead to problems.

I recommend you just delete this environment and create a new one.

This is not a packaging issue, so I’ll close it.

rgommers on May 16, 2021

I had another look, this isn’t fixable by us in a reasonable way. @jpmaterial please use CONDA_DLL_SEARCH_MODIFICATION_ENABLE=1 if you want to use this config; it’s fixed in newer Python versions shipped by conda.

rgommers on Jul 18, 2022

If you’re using an IDE or a notebook that’s not started from the command line, you should be able to set the CONDA_DLL_SEARCH_MODIFICATION_ENABLE=1 environment variable globally, e.g. https://www.minitool.com/news/environment-variables-windows-10-005.html

rgommers on Dec 16, 2021

I had this issue (in conda) due to (apparently) incompatible scipy/numpy/Python versions:

* numpy 1.19.2 / scipy 1.7.3 / Python 3.8.8: works

* numpy 1.19.2 / scipy 1.8.0 / Python 3.8.8: this issue

* numpy 1.19.2 / scipy 1.8.0 / Python 3.8.13: works

* numpy 1.23.1 / scipy 1.8.0 / Python 3.8.8: works

* numpy 1.23.1 / scipy 1.8.0 / Python 3.9.18: this issue

This helped guide the way. Thank you.

Also :

numpy 1.21.1 / scipy 1.7.2 / Python 3.7.9: works

advcu987 on Jun 14, 2023

I had this issue (in conda) due to (apparently) incompatible scipy/numpy/Python versions:

numpy 1.19.2 / scipy 1.7.3 / Python 3.8.8: works
numpy 1.19.2 / scipy 1.8.0 / Python 3.8.8: this issue
numpy 1.19.2 / scipy 1.8.0 / Python 3.8.13: works
numpy 1.23.1 / scipy 1.8.0 / Python 3.8.8: works
numpy 1.23.1 / scipy 1.8.0 / Python 3.9.18: this issue

jpmaterial on Sep 20, 2022

@rgommers thanks for your reply, works for me.

As a post at https://linuxtut.com/en/d4f5452fab5b59b67f39/ says this environment variable should set when load wrong dll from Windows/System32 folder.

But seems this issue is a different situation. Could you please explain how this set works for scipy? Thanks.

I mean there are many dlls under site-packages why only import scipy failed (as I know)?

roachsinai on Dec 16, 2021

same error with scipy 1.7.3 + miniconda + conda 4.11.0 + python 3.8.12

roachsinai on Dec 16, 2021

@baccandr can you try if export CONDA_DLL_SEARCH_MODIFICATION_ENABLE=1 fixes this for you?

xref https://github.com/scipy/scipy/issues/11062#issuecomment-912921620, seems related (but not identical).

rgommers on Nov 26, 2021