poetry selects wrong python version when markers present

[maciejskorski]

• 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: linux + Python 3.8.10
• Poetry version: 1.2.0a2 (recent master)

Issue

Multiple constraints on python version fail when combined with valid markers.

This does work fine

# selecting 1.3.1 matching the system
[tool.poetry.dependencies]
python = "~3.8"
pandas = [
    {version="1.3.2",python='~3.9'},
    {version="1.3.1",python='~3.8'},
]

but not this

# selecting incompatible 1.3.2 and ignoring 1.3.1 - error
[tool.poetry.dependencies]
python = "~3.8"
pandas = [
    {version="1.3.2",python='~3.9',markers="sys_platform=='linux'"},
    {version="1.3.1",python='~3.8'},
]

when I move everything to markers it works fine again

# selecting 1.3.1 - fine!
[tool.poetry.dependencies]
python = "~3.8"
pandas = [
    {version="1.3.2",markers="python_version=='3.9' and sys_platform=='linux'"},
    {version="1.3.1",markers="python_version=='3.8'"},
]

[radoering]

Probably duplicate of #3444

[maciejskorski]

Related to #3444 but highlights bit different issues. From the logs it seems poetry doesn't merge package requirements.

  • Installing pandas (1.3.1)
  • Installing pandas (1.3.2)

UPDATE: the precise root-cause for both is clarified in #4965

[github-actions]

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