PIP install dependency conflict

[yvvijay121]

OS: Windows 10
I'm having issues with installing pathlib, so this could be why.
Happened when attempting to install from git repository and locally.

ERROR: Cannot install OpenFisca-US because these package versions have conflicting dependencies.

The conflict is caused by:
    openfisca-us-data 0.1.3 depends on pathlib
    openfisca-us-data 0.1.2 depends on pathlib

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict

[nikhilwoodruff]

Hmm, yeah the package definitely uses pathlib in a few places so probably unavoidable to install - could you share the issue with installing pathlib?

[yvvijay121]

Yes, here's the error statement when attempting to install pathlib:

ERROR: Could not find a version that satisfies the requirement pathlib (from versions: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.97, 1.0, 1.0.1)
ERROR: No matching distribution found for pathlib

If you need more information, I'll also add the complete output of pip install pathlib.

[nikhilwoodruff]

That'd be useful, thanks. Is it possible you could be using Python 2.7?

[yvvijay121]

No, I've confirmed that I am using Python 3.8.1.

[nikhilwoodruff]

OK, thanks - could you share the pathlib install error? That's probably the root cause here

[yvvijay121]

Sure! Attached is a text file with the complete output after running pip install pathlib.
pipoutput.txt

[CrimsonOHara]

I am facing the same issue. I am using Python 3.9, pathlib is supposed to be included after 3.4 so unsure why I get this error.

$ pyenv versions
  system
* 3.9.9 (set by /Users/sachi/openfisca-us/.python-version)
$ python -V
Python 3.9.9

I got this in the logs

The conflict is caused by:
    openfisca-us-data 0.1.3 depends on pathlib

Perhaps because of this dependency https://github.com/PolicyEngine/openfisca-us-data/blob/master/setup.py#L15

[CrimsonOHara]

I was able to solve it locally by building an egg of openfisca-us-data and then using it locally like this in setup.py.

    dependency_links=[
        # location to your egg file
        os.path.join(os.getcwd(), 'deps', 'openfisca_us_data-0.1.3-py3.9.egg'),
    ],

[nikhilwoodruff]

Weird - OK though - seems like the general solution could be to use Python 3.7 (that's what we're testing on - sorry I hadn't mentioned this!).

[MaxGhenis]

@yvvijay121 could you share your Python version? python -V

[yvvijay121]

@MaxGhenis, I already shared my Python version; I am using Python 3.8.1.

PS C:\Programming_Projects\PolicyEngine\openfisca-us> python -V
Python 3.8.1

[MaxGhenis]

Closing as we've confirmed that using Python 3.7 resolves the issue