ModuleNotFoundError: No module named 'OCC'` after installing `pythonocc-core=7.5.1` from conda-forge on Windows

[Wangyao1997-sdu]

Title: ModuleNotFoundError: No module named 'OCC' after installing pythonocc-core=7.5.1 from conda-forge on Windows

Hi, I'm trying to use pythonocc-core in a Conda environment on Windows, but I keep getting a ModuleNotFoundError even though the package appears to be installed.

Steps to reproduce

1. Create and activate a new conda environment (Python 3.9):

   conda create -n test_env python=3.9
   conda activate test_env
   

• Install pythonocc-core from conda-forge:
  conda install -c conda-forge pythonocc-core=7.5.1

• Try to import a module:
  from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakeBox

Expected behavior
The import should succeed.

Actual behavior

   Traceback (most recent call last):
  File "test.py", line 1, in <module>
    from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakeBox
   ModuleNotFoundError: No module named 'OCC'

Environment

OS: Windows 11 (64-bit)
Python version: 3.9
Conda version: conda 25.5.1

Installed packages (conda list occ*):

# Name                     Version                  Build                  Channel
occ                        0.0.2.dev20190912195130  pypi_0                 pypi
occt                       7.5.1                    h60997fb_2             conda-forge
pythonocc-core             7.5.1                    py39h5d9d39a_1         conda-forge

Thank you for your help!

[Wangyao1997-sdu]

Maybe I've identified and resolved the root cause of the issue. The problem was a conflict between

• occ package installed via pip (from PyPI)
• pythonocc-core package installed via conda (from conda-forge)
  both packages were present, the pip install occ created a folder called 'occ' (lowercase) in my site-packages directory, which conflicted with the 'OCC' (uppercase) module from pythonocc-core.
  Now I executed pip uninstall occ and everything works smoothly!