Installation fails due to conflicting pymongo version

[NeolithEra]

Hi, users are unable to run flask-mongokat due to dependency conflict with pymongo package. As shown in the following full dependency graph of flask-mongokat, flask-mongokat requires pymongo *，while mongokat requires pymongo ==3.0.3.

According to pip’s “first found wins” installation strategy, pymongo 0.9.3 is the actually installed version. However, pymongo 0.9.3 does not satisfy ==3.0.3.

Dependency tree-----------

flask-mongokat - 1.0
| +- flask(install version:1.1.1 version range:*)
| | +- click(install version:7.0 version range:>=5.1)
| | +- itsdangerous(install version:1.1.0 version range:>=0.24)
| | +- jinja2(install version:2.10.3 version range:>=2.10.1)
| | | +- markupsafe(install version:1.1.1 version range:>=0.23)
| | +- werkzeug(install version:0.16.0 version range:>=0.15)
| +- mongokat(install version:0.2.0 version range:*)
| | +- pymongo (install version:3.0.3 version range:==3.0.3)
| +- pymongo(install version:3.9.0 version range:*)

Thanks for your help.
Best,
Neolith

[NeolithEra]

Suggested Solution

1. Ask your upstream project mongokat to loose the version range of pymongo.
2. Remove your direct dependency pymongo, and use pymongo transitively introduced by mongokat.

@FranciscoCarbonell Which solution do you prefer, 1 or 2?
Please let me know your choice. I can submit a PR to solve this issue.