Conda install: missing filelock when running Sphinx doctests

[mrmundt]

Description

While attempting to use enum_tools.autoenum via conda installation, doctests fail due to a missing import.

Error message:

Extension error:  
    Could not import extension enum_tools.autoenum (exception: 
    NOTE: In order to use the FileCache you must have 
    filelock installed. You can install it via pip:  
      pip install cachecontrol[filecache]  
    )

Steps to Reproduce

We encountered this issue when adding enum_tools.autoenum to our documentation on Pyomo. The steps below assume you have cloned Pyomo and installed its deps via conda. You can see a real-life log of all steps in our GitHub actions workflows.

conda install enum_tools
make -C doc/OnlineDocs doctest -d

Actual result:

Error message:

Extension error:  
    Could not import extension enum_tools.autoenum (exception: 
    NOTE: In order to use the FileCache you must have 
    filelock installed. You can install it via pip:  
      pip install cachecontrol[filecache]  
    )

Expected result:

Doctests can run without having to also manually installing filelock.

Reproduces how often:

Always unless you manually run conda install filelock in addition to conda install enum_tools

Version

• Operating System: Windows
• Python: (All versions tested - 3.8 through 3.12)
• enum_tools: 0.11.0

Installation source

Anaconda/conda

Other Additional Information:

See this commit for code that will produce failure message: https://github.com/mrmundt/pyomo/tree/23bdbf7b76f674b5d437a3136387e28a84844086
See this commit for workaround implementing filelock: mrmundt/pyomo@d405bcb