# Module petsc4py not found on Anaconda **URL:** \ **Category:** dolfinx\ **Tags:** dolfinx, petsc, variational-form\ **Created:** [March 26, 2025, 10:33am UTC](https://fenicsproject.discourse.group/t/module-petsc4py-not-found-on-anaconda/17315 "2025-03-26T10:33:50Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Inuwashi](https://avatars.discourse-cdn.com/v4/letter/i/ebca7d/32.png) [@Inuwashi](https://fenicsproject.discourse.group/u/Inuwashi)\ **Post date:** [March 26, 2025, 10:33am UTC](https://fenicsproject.discourse.group/t/module-petsc4py-not-found-on-anaconda/17315/1 "2025-03-26T10:33:50Z")
Hello, I’m posting here because I’m having an issue with the `petsc4py` module. I’m trying to solve the heat equation, and to create the variational form, I need to use `dolfinx.fem.petsc.LinearProblem`. However, the `petsc` module is not found and does not exist on Anaconda (Windows). How can I install it? Or is there another way to solve this problem using different modules? Thank you for your response. ```auto from dolfinx.fem.petsc import LinearProblem --------------------------------------------------------------------------- ModuleNotFoundError Traceback (most recent call last) Cell In[11], line 1 ----> 1 from dolfinx.fem.petsc import LinearProblem File ~\anaconda3\envs\fenicsx-env\Lib\site-packages\dolfinx\fem\petsc.py:20 17 import functools 18 import typing ---> 20 from petsc4py import PETSc 22 # ruff: noqa: E402 23 import dolfinx ModuleNotFoundError: No module named 'petsc4py' ``` ---
**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\ **Post date:** [March 26, 2025, 4:08pm UTC](https://fenicsproject.discourse.group/t/module-petsc4py-not-found-on-anaconda/17315/2 "2025-03-26T16:08:56Z")
PETSc is not supported on windows (unfortunately), as stated in > **[GitHub - FEniCS/dolfinx: Next generation FEniCS problem solving environment](https://github.com/FEniCS/dolfinx/?tab=readme-ov-file#conda)** > > Next generation FEniCS problem solving environment > _Windows only_: Windows conda packages are currently in beta testing. PETSc and petsc4py are not available on Windows; as an alternative we recommend using `pyamg` following `python/demo/demo_pyamg.py`. Because FEniCS uses just-in-time compilation it necessary to install [Microsoft Visual Studio](https://visualstudio.microsoft.com/downloads/). There are several demos at: [FEniCS workshop — FEniCS Workshop](https://jsdokken.com/FEniCS-workshop/README.html) that doesn’t rely on PETSc, and you also have: [Solve the Poisson and linearised elasticity equations using pyamg — DOLFINx 0.9.0 documentation](https://docs.fenicsproject.org/dolfinx/v0.9.0/python/demos/demo_pyamg.html)