Conditional dependencies results in exceeeding maximum recursion depth (for manimlib with pycairo)

[JulianStier]

• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate. It might be related to

  • Maximum recursion depth exceeded with manimlib #1222
  • Maximum recursion depth exceeded #1238

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Ubuntu 18.04.3 LTS // Linux 4.15.0-74-generic Attribute error if python="^3.5" but not with python="*" in 0.9.0.a2 #84-Ubuntu SMP Thu Dec 19 08:06:28 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

• Poetry version: 1.0.2

• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/JulianStier/e8b041396b26bdc3b542530404e28277

Issue

Trying to install manimlib:
poetry add manimlib

Error:

[RecursionError]
maximum recursion depth exceeded while calling a Python object

Executed with -vv:

0: Duplicate dependencies for pycairo
0: Different requirements found for pycairo (1.17.1) and pycairo (>=1.18.0).

A look into https://github.com/3b1b/manim/blob/master/requirements.txt:

pycairo==1.17.1; sys_platform == 'linux'
pycairo>=1.18.1; sys_platform == 'win32'

Apparently poetry does not recognize conditionally defined requirements based on "sys_platform".

[lvkswrks]

Probably related / same as #992

[abn]

Fixed in 1.1.0b2. Requires regeneration of lock file. Note that new lock file is not compatible with older versions of poetry.

[github-actions]

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