[BUG] ModuleNotFoundError: No module named 'numpy.core'

Expected behavior

I don’t expect any output as the doctests should all pass

Actual behavior

I want to run doctests, so I want to run for example python3 operation.py (inside /pennylane/pennylane/operation.py), but I get that error module not found.

Additional information

No response

Source code

No response

Tracebacks

Traceback (most recent call last):
  File "/opt/homebrew/Cellar/python@3.9/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/subprocess.py", line 73, in <module>
    import msvcrt
ModuleNotFoundError: No module named 'msvcrt'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/kristiyandilov/pennylane/pennylane/operation.py", line 108, in <module>
    import pennylane as qml
  File "/opt/homebrew/lib/python3.9/site-packages/pennylane/__init__.py", line 20, in <module>
    import pkg_resources
  File "/opt/homebrew/lib/python3.9/site-packages/pkg_resources/__init__.py", line 30, in <module>
    import platform
  File "/opt/homebrew/Cellar/python@3.9/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/platform.py", line 119, in <module>
    import subprocess
  File "/opt/homebrew/Cellar/python@3.9/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/subprocess.py", line 80, in <module>
    import selectors
  File "/opt/homebrew/Cellar/python@3.9/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/selectors.py", line 11, in <module>
    import math
  File "/Users/kristiyandilov/pennylane/pennylane/math/__init__.py", line 34, in <module>
    import autoray as ar
  File "/opt/homebrew/lib/python3.9/site-packages/autoray/__init__.py", line 1, in <module>
    from .autoray import (
  File "/opt/homebrew/lib/python3.9/site-packages/autoray/autoray.py", line 26, in <module>
    import numpy as _numpy
  File "/Users/kristiyandilov/pennylane/pennylane/numpy/__init__.py", line 84, in <module>
    from autograd import numpy as _np
  File "/opt/homebrew/lib/python3.9/site-packages/autograd/__init__.py", line 2, in <module>
    from .differential_operators import (
  File "/opt/homebrew/lib/python3.9/site-packages/autograd/differential_operators.py", line 13, in <module>
    import autograd.numpy as np
  File "/opt/homebrew/lib/python3.9/site-packages/autograd/numpy/__init__.py", line 2, in <module>
    from .numpy_wrapper import *
  File "/opt/homebrew/lib/python3.9/site-packages/autograd/numpy/numpy_wrapper.py", line 7, in <module>
    from numpy.core.einsumfunc import _parse_einsum_input
ModuleNotFoundError: No module named 'numpy.core'

System information

Name: PennyLane
Version: 0.25.0.dev0
Summary: PennyLane is a Python quantum machine learning library by Xanadu Inc.
Home-page: https://github.com/XanaduAI/pennylane
Author: 
Author-email: 
License: Apache License 2.0
Location: /opt/homebrew/lib/python3.9/site-packages
Requires: appdirs, autograd, autoray, cachetools, networkx, numpy, pennylane-lightning, retworkx, scipy, semantic-version, toml
Required-by: PennyLane-Lightning

Platform info:           macOS-12.3.1-arm64-arm-64bit
Python version:          3.9.10
Numpy version:           1.23.0
Scipy version:           1.8.1
Installed devices:
- default.gaussian (PennyLane-0.25.0.dev0)
- default.mixed (PennyLane-0.25.0.dev0)
- default.qubit (PennyLane-0.25.0.dev0)
- default.qubit.autograd (PennyLane-0.25.0.dev0)
- default.qubit.jax (PennyLane-0.25.0.dev0)
- default.qubit.tf (PennyLane-0.25.0.dev0)
- default.qubit.torch (PennyLane-0.25.0.dev0)
- lightning.qubit (PennyLane-Lightning-0.24.0)

Existing GitHub issues

• I have searched existing GitHub issues to make sure the issue does not already exist.

[antalszava]

Just had a chat with Josh on this and the issue arises because of our custom NumPy implementation done in the numpy module. This module is attempted to be used for the import as per namespacing.

For this reason, this error is expected. I’ll close this issue, it can be reopened if this causes any other issues.

[CatalinaAlbornoz]

Hi @kris524, thank you for posting this issue here. I have looked into the issue and the most likely explanations are that your version of numpy is broken or that it’s being pulled from some unexpected place. A lot of people seem to have had this issue as can be seen here.

The common suggestion there is to try

pip uninstall numpy
conda install numpy

If this doesn’t work the best possible actions to follow probably are:

1. Create a new virtual environment. This conda cheat sheet can be very helpful.
2. Install only the libraries you need in this new environment.

If the problem persists please let me know! We want to help you fix this problem.