Installing pandas and Python versioning

[thmsklngr]

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Ubuntu 18.04 LTS
• Poetry version: 1.0.5
• Link of a Gist with the contents of your pyproject.toml file:

Issue

I tried to install pandas todady using Poetry and it failed several times.
The result was:

[SolverProblemError]
The current project's Python requirement (^3.6) is not compatible with some of the required packages Python requirement:
  - pandas requires Python >=3.6.1

Because pandas (1.0.3) requires Python >=3.6.1
 and no versions of pandas match >1.0.3,<2.0.0, pandas is forbidden.
So, because edis depends on pandas (^1.0.3), version solving failed.

I had python = "^3.6" in my pyproject.toml, originally set by Poetry on initializing the virtual environment. I then tried different values in the order python = "3.6", python = ">=3.6.1, < 3.7" until I set it to python = ">=3.6.1" and then succeeded with the installation. Python version used in the environment is 3.6.9. Somehow weird.
Regards, Thomas

[finswimmer]

Hello @mosesontheweb,

short answer: poetry resolves the dependencies for all python versions declared in the pyproject.toml and not just the one currently used.

Long answer: Please see my comment in #2444 (comment)

Setting python = ^3.6.1 should solve your problem.

fin swimmer

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