circular (or cyclic) import problem occurred in doctest of rdkit_utils.py

🐛 Bug

While running doctest on deepchem/utils/rdkit_utils.py, an error occurred which suggested that may be, the file: deepchem/utils/typing.py having the same name as the module it imports (typing), is causing the circular (or cyclic) import problem.

To Reproduce

Steps to reproduce the behavior:

1. open terminal from deepchem/utils
2. python -m doctest rdkit_utils.py
3. Following error is reported:-

Expected behavior

There should not be any problem importing type annotations from the typing module or importing from the deepchem.utils.typing file.

Environment

• OS: Ubuntu 20.04.3 LTS
• Python version: Python 3.8.8
• DeepChem version: 2.6.1
• RDKit version (optional):
• TensorFlow version (optional):
• PyTorch version (optional):
• Any other relevant information: NA

Additional context

https://stackoverflow.com/questions/744373/circular-or-cyclic-imports-in-python

[arunppsg]

@arunppsg So, how does CI run the doctests? Hope it is the same way as you told me to do.

CI runs from the root folder of the repository.

[ARY2260]

@arunppsg So, how does CI run the doctests? Hope it is the same way as you told me to do.